Exploring Polarity Reversing Switch: Material Grades, Properties, and Uses

Types of Polarity Reversing Switches

A polarity reversing switch is an essential electrical component designed to reverse the direction of current flow in a circuit by switching the positive and negative connections. These switches typically feature six terminals and are widely used in applications such as motor direction control, robotics, model trains, and industrial automation systems. By altering the polarity, these switches enable bidirectional operation of DC motors and other polarity-sensitive devices, offering precise control over mechanical movement.

Rockers Polarity Reversing Switch

Compact and user-friendly, rocker-type polarity switches are ideal for low-voltage DC circuits. They operate with a simple ON/OFF toggle mechanism and often include labeled terminals for easy wiring.

Advantages

• Simple and intuitive operation
• Clear visual ON/OFF indication
• Space-saving compact design
• Terminal labels simplify installation

Limitations

• Limited to basic ON/OFF functionality
• Not suitable for momentary operations
• May wear out with frequent switching

Best for: Permanent installations, battery-powered devices, automotive accessories

Toggle Polarity Reversing Switch

These mechanical switches offer three-position control (ON-OFF-Momentary) and are commonly used in directional motor control. Their robust design makes them reliable for repeated use in DC circuits.

Advantages

• Precise three-position control
• Durable construction for long-term use
• Ideal for motor direction reversal
• Commonly used in hobby and industrial applications

Limitations

• Larger than rocker switches
• Mechanical wear over time
• Requires more panel space

Best for: RC models, robotics, industrial controls, directional motor systems

Push-Button Polarity Reversing Switch

Momentary-action switches that reverse polarity only while depressed. They provide temporary control, making them perfect for applications requiring short bursts of directional movement.

Advantages

• Enables temporary directional control
• Prevents accidental continuous operation
• Quick response time
• Ideal for safety-critical applications

Limitations

• Requires constant pressure for operation
• Not suitable for sustained operation
• May require spring replacement over time

Best for: Test equipment, emergency stop systems, temporary motor control, prototyping

Rotary Polarity Reversing Switch

Mechanical switches with a rotating shaft that selects different circuit configurations. They can offer multiple positions and are excellent for complex switching needs in a single control point.

Advantages

• Multiple switching positions available
• Highly customizable circuit control
• Compact for multi-function applications
• Secure, stable connections

Limitations

• More complex wiring setup
• Higher cost than basic switches
• Slower operation compared to toggles

Best for: Test benches, multi-mode equipment, industrial machinery, laboratory setups

Solid-State Polarity Reversing Switch

Electronic switches that use semiconductor components (like MOSFETs or H-bridges) to reverse polarity without moving parts. These provide fast, silent, and highly reliable switching.

Advantages

• No mechanical wear (long lifespan)
• Extremely fast switching speeds
• Silent operation
• High resistance to vibration and shock

Limitations

• Higher initial cost
• May require heat dissipation management
• More complex circuit integration

Best for: Automated systems, precision robotics, high-cycle applications, environments with high vibration

Type	Switching Mechanism	Durability	Response Time	Best Applications
Rockers	Mechanical (ON/OFF)	Good	Medium	Basic DC circuits, automotive, consumer devices
Toggle	Mechanical (3-position)	Very Good	Medium	Motor control, RC models, industrial tools
Push-Button	Momentary Mechanical	Good	Fast	Temporary control, safety systems, testing
Rotary	Mechanical (Multi-position)	Very Good	Slow	Complex systems, lab equipment, multi-mode devices
Solid-State	Electronic (Semiconductor)	Excellent	Very Fast	Automation, robotics, high-reliability systems

Expert Tip: When wiring polarity reversing switches, always double-check terminal connections using a multimeter in continuity mode before powering the circuit. Incorrect wiring can cause short circuits or damage to connected devices, especially motors and power supplies.

Specifications and Maintenance of Polarity Reversing Switches

Polarity reversing switches are essential components in electrical systems where the direction of current flow must be changed, such as in motor control, battery charging circuits, and DC power applications. Understanding their key specifications ensures safe, reliable operation, while proper maintenance extends service life and prevents system failures.

Key Specifications of Polarity Reversing Switches

Selecting the right polarity reversing switch requires careful evaluation of several technical and environmental factors. Below is a detailed breakdown of the most important specifications to consider when choosing or replacing a switch.

Current Rating

The current rating indicates the maximum continuous electrical current the switch can safely carry without overheating or sustaining damage. Exceeding this limit can lead to contact degradation, arcing, or even fire hazards. Ratings are typically specified in amperes (A) and should match or exceed the expected load in the circuit. For high-power applications like industrial motors, switches with higher current ratings (e.g., 20A–100A) are necessary.

Voltage Rating

The voltage rating defines the maximum voltage the switch can handle without risking insulation breakdown or arcing between contacts. It is crucial to match the switch’s voltage rating to the system’s operating voltage—whether 12V, 24V, or higher in DC systems, or up to rated AC voltages. Using an under-rated switch may result in catastrophic failure, especially under load switching conditions.

Contact Material

The material used for the switch contacts significantly impacts conductivity, durability, and resistance to corrosion and arcing. Common materials include:

• Copper: High conductivity and cost-effective, but prone to oxidation.
• Silver: Excellent conductivity and arc resistance; often used in high-current applications.
• Gold-plated contacts: Superior corrosion resistance, ideal for low-voltage signal circuits.

Material choice should align with environmental conditions and electrical demands.

Operation Type

This refers to the physical method used to actuate the switch. Common types include:

• Toggle: Durable and easy to use; common in industrial panels.
• Push-button: Momentary or latching; suitable for frequent operation.
• Rotary: Allows multiple positions and precise control.
• Lever: Offers mechanical advantage for heavy-duty switching.

The selection should consider user accessibility, frequency of use, and integration with control panels.

Mounting Type

The mounting configuration determines how the switch is installed and integrated into the system. Options include:

• Panel mount: Securely fastened through a cutout in a control panel.
• Surface mount: Attached directly to a flat surface using screws or adhesive.
• PCB mount: Soldered directly onto a printed circuit board; ideal for compact electronics.

Ensure compatibility with the enclosure design and space constraints.

Switching Mechanism

The internal mechanism governs how the contacts open and close. Types include:

• Mechanical: Manual actuation via lever or button; most common.
• Electromechanical: Uses a solenoid or relay; allows remote control.
• Magnetic (reed switches): Activated by magnetic fields; used in sealed environments.

Choose based on automation needs, reliability, and environmental sealing requirements.

Size and Dimensions

Physical dimensions—including length, width, height, and depth—are critical for fitment within enclosures or control boxes. Compact switches are preferred in space-constrained applications, while larger switches may offer better ergonomics and heat dissipation. Always verify mounting cutouts and clearance for wiring and operation.

Environmental Rating

Environmental protection ratings indicate the switch’s resilience to dust, moisture, vibration, and temperature extremes. Key standards include:

• IP (Ingress Protection) Code: e.g., IP65 (dust-tight and protected against water jets).
• Operating Temperature: Typically ranges from -30°C to +85°C.
• Humidity Resistance: Important for outdoor or marine environments.

For harsh environments, sealed switches with high IP ratings are strongly recommended.

Durability and Lifespan

Lifespan is usually expressed in operational cycles (e.g., 10,000–100,000 cycles). Factors affecting longevity include contact material, switching load, frequency of use, and environmental exposure. High-quality switches with robust mechanisms and noble metal contacts offer extended service life, especially in frequently operated systems.

Specification	Importance	Selection Tips
Current Rating	High	Select a switch rated at least 20% above the maximum expected load to ensure safety and longevity.
Voltage Rating	High	Match the switch voltage rating exactly or higher than the system voltage; never lower.
Contact Material	Medium-High	Use silver or gold-plated contacts for high-reliability or corrosive environments.
Environmental Rating	Medium	Choose IP65 or higher for outdoor, washdown, or dusty applications.
Operation Type	Medium	Toggle or rotary switches are preferred for manual control; push-button for momentary use.
Durability (Cycle Life)	High	Opt for switches with ≥50,000 cycles for frequent operation.

Essential Maintenance Practices

Regular maintenance of polarity reversing switches ensures consistent performance, prevents unexpected failures, and enhances system safety. Follow these best practices to keep switches in optimal condition:

Inspections: Conduct routine visual and functional checks for signs of wear, discoloration, loose terminals, or physical damage. Pay close attention to contact integrity and housing stability. Look for carbon buildup or pitting on contacts, which can impair conductivity.

Cleaning: Remove dust, dirt, and oxidation from contacts using a soft brush or lint-free cloth. Use a dedicated electrical contact cleaner to dissolve grime and prevent corrosion. Avoid abrasive pads or solvents that could damage plating or insulation.

Lubrication: Apply dielectric grease or manufacturer-recommended lubricants to moving parts (e.g., toggle joints or rotary shafts) to reduce friction and prevent sticking. Do not over-lubricate, as excess grease can attract contaminants.

Testing: Periodically test the switch using a multimeter to verify continuity and correct polarity reversal. Measure resistance across contacts to detect high impedance due to wear or contamination. Ensure the switch operates smoothly without hesitation or arcing.

Replacement: Replace switches showing signs of excessive wear, inconsistent operation, or physical damage. Use OEM or equivalent-rated replacements to maintain system integrity. Never operate a damaged switch, as it may cause short circuits or equipment damage.

Documentation: Maintain a log of all inspections, cleaning, tests, and replacements. This record supports predictive maintenance, warranty claims, and compliance with safety standards such as OSHA or IEC.

Important: Always disconnect power before inspecting or servicing polarity reversing switches. Working on live circuits poses serious electrical shock and arc-flash risks. Follow lockout/tagout (LOTO) procedures and use appropriate personal protective equipment (PPE). Adhering to manufacturer guidelines and industry standards ensures both safety and optimal switch performance.

How to Choose Polarity Reversing Switches

Selecting the right polarity reversing switch is essential for ensuring safe, reliable, and efficient operation in electrical and electronic systems. These switches are commonly used in applications such as motor direction control, battery charging circuits, and DC power management. To meet customer demands effectively, consider the following comprehensive criteria when sourcing or recommending polarity reversing switches.

Switch Type

The physical design and actuation style of a switch significantly influence user experience and application suitability. Different switch types offer unique advantages depending on the environment and usage patterns.

• Toggle switches are ideal for general-purpose applications due to their durability, clear on/off positions, and ease of use in industrial or automotive settings.
• Rocker switches provide a larger surface area and are often preferred in high-vibration environments due to their robust construction and resistance to accidental activation.
• Push-button switches offer a sleek, modern appearance and quieter operation, making them suitable for consumer electronics and applications where noise reduction is important. While not gender-specific, they are often favored in compact or aesthetically driven designs.

Key consideration: Match the switch type to the application’s mechanical and ergonomic requirements.

Current and Voltage Ratings

Matching the electrical specifications of the switch to the load ensures long-term reliability and prevents premature failure due to overheating or arcing.

• For low-current applications (e.g., LED lighting, small sensors, or control circuits), switches rated for 1–5A at 12V–24V DC are typically sufficient.
• For high-current applications (e.g., large DC motors, solenoids, or power tools), select switches rated for 10A–30A or higher, with appropriate heat dissipation features.
• Voltage compatibility is critical: use switches rated for at least the maximum system voltage. Common configurations include DC 12V for automotive and solar systems, and DC 24V–48V for industrial and commercial equipment.

Safety note: Always derate switches by 20–30% for continuous loads to extend lifespan and prevent thermal stress.

Contact Material and Quality

The contact material directly affects conductivity, resistance to corrosion, and longevity under repeated switching cycles.

• Gold-plated contacts offer excellent conductivity and corrosion resistance, making them ideal for low-current signal circuits and sensitive electronics.
• Silver or silver alloy contacts are better suited for high-current applications due to their superior thermal and electrical conductivity, though they may tarnish over time in humid environments.
• Look for switches with arc-resistant materials and built-in contact protection to minimize wear in inductive loads.

Technical insight: High-quality switches often use dual-wipe contact mechanisms to maintain clean electrical paths over time.

Mounting Style and Size

Proper mounting ensures secure installation and compatibility with existing enclosures or PCB layouts.

• Through-hole switches are preferred for heavy-duty applications and hand-soldered prototypes due to their mechanical stability.
• Surface-mount (SMD) switches are ideal for compact, high-density PCBs used in consumer electronics and automated manufacturing.
• Offer a range of sizes—from standard panel-mount (e.g., 16mm, 19mm) to miniature subminiature switches—for flexibility across applications.
• Compact, low-profile designs are increasingly in demand for space-constrained devices like portable tools and IoT equipment.

Design tip: Provide dimensional drawings and cutout templates to assist customers with integration.

Operation Method

The actuation behavior determines how the switch functions in a circuit and impacts user control.

• Momentary switches return to their default position when released, ideal for temporary reversal (e.g., motor jog controls).
• Maintained (latching) switches stay in position until toggled again, perfect for applications requiring persistent polarity change without constant user input.
• Some advanced models feature center-off positions for safety, allowing users to disconnect power before reversing polarity.

Application match: Use momentary switches for testing or positioning; maintained switches for operational control.

Environmental Protection and Housing

The switch housing protects internal components from environmental damage and enhances safety.

• Choose switches with IP65 or higher ratings for dust-tight and water-resistant performance in outdoor, marine, or industrial environments.
• Robust housings made from engineering plastics (e.g., polycarbonate) or metal alloys resist impact, UV exposure, and chemical corrosion.
• Sealed gaskets and silicone boots prevent moisture ingress in high-humidity or washdown areas.

Critical for reliability: In harsh conditions, sealed switches reduce maintenance and downtime.

Additional Features

Enhanced functionality can significantly improve usability and safety in real-world applications.

• Integrated LED indicators provide visual feedback on polarity state, reducing operator error in complex systems.
• Locking mechanisms (e.g., key locks or safety covers) prevent unauthorized or accidental switching in critical operations.
• Some switches include terminal guards or insulated caps for improved electrical safety.
• For panel mounting, illuminated rings or color-coded actuators improve visibility and user interface clarity.

Value-added benefit: Feature-rich switches command higher margins and appeal to professional users.

Standards and Certifications

Compliance with industry standards ensures safety, interoperability, and market acceptance.

• Look for switches certified by UL, CE, RoHS, or IEC standards, especially for export or regulated industries.
• Automotive applications may require ISO 8820 or AEC-Q100 compliance.
• Industrial switches should meet IP and NEMA ratings for environmental protection.

Buyer confidence: Certified products reduce liability and support warranty claims.

Professional Recommendation: When serving diverse customers, stock a range of switches from economy to industrial-grade. Offer combination packs (e.g., switch with mounting nut, seal, and LED) to simplify procurement. For technical buyers, provide datasheets with contact resistance, life cycle ratings (e.g., 50,000+ cycles), and derating curves to support informed decisions.

Application Type	Recommended Switch Type	Current Rating	Key Features
Automotive Accessories	Toggle or Rocker	10A–20A @ 12V DC	Waterproof housing, LED indicator
Consumer Electronics	Push-button (SMD)	1A–3A @ 5V–12V DC	Compact size, gold contacts
Industrial Motor Control	Maintained Rocker	15A–30A @ 24V–48V DC	Heavy-duty housing, arc suppression
Marine & Outdoor Equipment	Sealed Toggle	10A–25A @ 12V–24V DC	IP67 rating, corrosion-resistant

Additional Considerations

• Lifecycle Durability: High-quality switches offer 50,000 to 100,000+ mechanical cycles—verify test data from manufacturers.
• Noise and Vibration: In sensitive environments, opt for dampened actuators or rubber-sealed mechanisms.
• Terminal Type: Screw terminals, quick-connects, or solder lugs should match customer assembly methods.
• Color Coding: Use red/black or +/- labeling to prevent wiring errors during polarity reversal.
• Supplier Reliability: Partner with brands known for consistency, technical support, and availability to reduce supply chain risks.

DIY Guide: How to Replace a Polarity Reversing Switch

A polarity reversing switch is an essential component in many electrical systems, commonly used in motors, power supplies, and electronic devices to reverse the direction of current flow. Whether you're repairing a piece of equipment or upgrading a system, replacing a faulty or outdated polarity reversing switch can restore proper function and prevent further damage. This comprehensive guide walks you through the entire process—from preparation to testing—with safety tips, best practices, and expert advice to ensure a successful replacement.

Safety Warning: Always disconnect power before beginning any electrical work. Working with live circuits poses serious risks including electric shock, fire, and equipment damage. Verify power is off using a non-contact voltage tester. If you're unsure about any step, consult a licensed electrician.

Step-by-Step Replacement Procedure

1. Gather Essential Tools and Materials
   • Flathead and Phillips screwdrivers for removing panels and securing terminals
   • Wire strippers to prepare wire ends for reconnection
   • Needle-nose pliers for handling small wires and terminals
   • Electrical tape or heat-shrink tubing for insulating connections
   • Soldering iron and rosin-core solder (if connections are soldered)
   • Voltage tester to confirm power is off before starting
   • Replacement polarity reversing switch (ensure it matches voltage, current, and pin configuration)
   • Labeling tape and a camera or notepad for documenting wiring
2. Disconnect Power Supply
   • Turn off the circuit breaker or unplug the device from the power source.
   • Lock out the breaker if possible to prevent accidental re-energizing.
   • Use a voltage tester to double-check that no power is present at the switch location.
   • Wait a few minutes if working with capacitive circuits to allow stored energy to dissipate.
3. Remove the Switch Panel or Enclosure
   • Use the appropriate screwdriver to remove mounting screws from the access panel.
   • Gently pry open the panel using a plastic tool to avoid scratching surfaces or damaging wiring.
   • Set screws and panel aside in a safe place to avoid loss.
   • Inspect the surrounding area for signs of heat damage, corrosion, or loose components.
4. Document the Existing Wiring Configuration
   • Take a high-resolution photo of the switch and all connected wires from multiple angles.
   • Label each wire with numbered tags or colored tape for easy identification.
   • Draw a simple wiring diagram showing which wire connects to which terminal (e.g., COM, NO, NC).
   • Note the switch type (SPDT, DPDT) and terminal markings to ensure correct replacement installation.
5. Disconnect Wires from the Old Switch
   • Loosen terminal screws and carefully remove wires one at a time.
   • If wires are soldered, use a desoldering pump or wick to remove solder safely.
   • Inspect wire ends for fraying, corrosion, or insulation damage—trim and strip as needed.
   • Keep wires separated and organized to prevent confusion during reconnection.
6. Install and Connect the New Polarity Reversing Switch
   • Position the new switch into the mounting bracket or housing.
   • Follow your wiring diagram or photo to reconnect each wire to the correct terminal.
   • Ensure terminal screws are tightened securely to prevent arcing or overheating.
   • If soldering, apply heat evenly and use flux for strong, clean joints. Insulate with heat-shrink tubing.
   • Double-check polarity: reversing switches must correctly swap positive and negative connections when toggled.
7. Secure the Switch and Reassemble the Panel
   • Mount the switch firmly using included hardware or clips.
   • Neatly route wires to avoid pinching or stress on connections.
   • Reattach the access panel and secure all screws.
   • Ensure no tools or debris are left inside the enclosure.
8. Test the Switch Operation
   • Restore power to the circuit or device.
   • Toggle the switch and observe system behavior (e.g., motor direction change).
   • Use a multimeter to verify voltage polarity reversal across the output terminals.
   • Check for abnormal heating, buzzing, or sparking—immediately power down if detected.
   • Confirm consistent operation in both switch positions.
9. Finalize and Document the Repair
   • Once confirmed working, apply additional electrical tape or strain relief if needed.
   • Record the replacement date, switch model, and any observations in your maintenance log.
   • Dispose of the old switch properly, especially if it contains hazardous materials.
   • Keep spare switches and documentation for future repairs.

Switch Type	Common Applications	Terminal Configuration	Replacement Tips
SPDT (Single Pole Double Throw)	Simple DC polarity reversal, small motors	COM, NO, NC terminals	Ensure center (COM) is correctly wired to power source
DPDT (Double Pole Double Throw)	Higher power motors, bidirectional control	Dual COM/NO/NC pairs	Match both poles for synchronized polarity swap
Latching vs. Momentary	Continuous vs. temporary reversal	Same as SPDT/DPDT	Verify switch action type matches original
Toggle vs. Rocker	Industrial vs. consumer equipment	Varies by design	Check physical fit and mounting dimensions

Expert Tip: When replacing a polarity reversing switch in a motor control circuit, perform a dry run without power first. Manually toggle the switch and use a continuity tester to confirm that contacts are switching as expected before re-energizing the system.

Maintenance and Safety Best Practices

• Always use a switch rated for your system’s voltage and current to prevent overheating or failure.
• Regularly inspect switches in high-use applications for contact wear or carbon buildup.
• Clean switch contacts with electrical contact cleaner if performance degrades over time.
• Label control switches clearly to avoid accidental operation by others.
• Consider using a protective cover or enclosure for switches in industrial or outdoor environments.
• Keep spare switches on hand for critical systems to minimize downtime during failures.

Replacing a polarity reversing switch is a manageable DIY task when approached with care and proper preparation. By following this guide, you can ensure a safe, reliable repair that extends the life of your equipment. Remember, electricity demands respect—when in doubt, seek professional help. Proper documentation and preventive maintenance will keep your systems running smoothly for years to come.

Frequently Asked Questions About Polarity Reversing Switches

Q1: Where can a polarity reversing switch be used?

A polarity reversing switch is a versatile electrical component used in various applications where the direction of current flow needs to be changed. Common uses include:

• DC Motor Control: Used to reverse the rotation of DC motors in robotics, electric vehicles, conveyor systems, and power tools by switching the positive and negative connections.
• Battery Management Systems: Enables safe switching between battery banks or facilitates charging/discharging sequences in dual-battery setups, such as in marine or RV applications.
• Audio Systems: Occasionally used in speaker testing or phase alignment to reverse signal polarity and assess sound quality or cancellation effects.
• Custom Electronics Projects: Ideal for hobbyists and engineers working on circuits requiring manual or automated polarity inversion, such as H-bridge prototypes or educational demonstrations.
• Solar Panel Testing: Helps in evaluating panel performance under reversed polarity conditions during diagnostic procedures.

These switches are especially valuable in systems where bidirectional operation or circuit protection is required without redesigning the entire wiring layout.

Q2: Can a polarity reversing switch be used on AC circuits?

No, polarity reversing switches are not suitable or necessary for AC (alternating current) circuits. Here's why:

• AC Current Behavior: In AC systems, the current naturally reverses direction many times per second (e.g., 50–60 Hz), making the concept of fixed polarity irrelevant.
• Switch Design Limitation: These switches are engineered for DC (direct current) systems where polarity determines device behavior, such as motor rotation or LED illumination direction.
• Safety and Functionality: Attempting to use a DC polarity reversing switch in an AC application may lead to improper operation, arcing, or damage due to differences in voltage characteristics and insulation requirements.

For controlling AC devices like motors, other solutions such as contactors, reversing starters, or dedicated AC motor controllers should be used instead.

Q3: What is the difference between a polarity reversing switch and a DPDT switch?

While often confused, a polarity reversing switch and a DPDT (Double Pole, Double Throw) switch serve related but distinct purposes:

Feature	Polarity Reversing Switch	DPDT Switch
Purpose	Specifically designed to reverse the polarity of a DC circuit, commonly used for motor direction control.	A general-purpose switch with six terminals that can control two separate circuits, each with two positions.
Wiring Configuration	Internally wired in an "H-bridge" configuration to automatically swap polarity when toggled.	No internal wiring; must be manually wired to achieve polarity reversal or other switching functions.
Versatility	Limited to polarity reversal tasks but optimized for ease of use and reliability in that role.	Highly versatile—can be used for polarity reversal, circuit selection, mode switching, or isolating power sources.
User Skill Requirement	Beginner-friendly; plug-and-play for reversing applications.	Requires electrical knowledge to wire correctly for specific functions.

In essence, all polarity reversing switches are typically built using DPDT mechanisms, but not all DPDT switches function as polarity reversers unless properly configured.

Q4: Are polarity reversing switches available in different voltage and current ratings?

Yes, polarity reversing switches come in a wide range of voltage and current ratings to accommodate diverse electrical and electronic applications. Selecting the correct rating is crucial for safety, efficiency, and longevity. Common specifications include:

• Voltage Ratings: Available from low-voltage models (e.g., 12V or 24V DC) for automotive and hobby projects to higher-rated versions (up to 125V or 250V DC) for industrial systems.
• Current Capacity: Ranges from 5A for small electronics to 30A or more for heavy-duty motors and machinery.
• Switch Types: Offered in toggle, rocker, or rotary styles, with materials rated for indoor or outdoor use, including waterproof enclosures for marine environments.
• Compliance Standards: Many switches meet UL, CE, or RoHS standards, ensuring reliability and regulatory compliance.

Always verify the switch’s specifications against your system’s maximum voltage and current draw. Using an underrated switch can lead to overheating, contact welding, or fire hazards. Consult the manufacturer’s datasheet and consider safety margins when selecting a switch for critical applications.