| Theory: Thermal Relay |
3SR8-F thermal overload relays are designed for use with contactors 3SC8-115 to 3SC8-330. In addition to the protection provided by modeled thermal overload relays 3SR8, they offer the following special features:
* Protection against phase imbalance.
* Choice of starting class.
* Protection of unbalanced circuits.
* Protection of single-phase circuits
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