DD949(S) single-phase watt-hour meter (round socket) is used to measure electric power in single-phase 50Hz or 60Hz AC circuit. It should be fixed to use with the limited working temperature of -30~+55°C. The relative humidity should not exceed 95% and without the corrosive gas and salty spray in the air. Its mechanical socket meter has the same cassette mechanism as DD949 meter. Its electronic meter has the same cassette mechanism as DDS949. Its dimension is designed as per American standard.

Structure
1. Case: round bakelite base and round transparent glass cover
2. Bearing: magnetic bearing or double-jewel bearing
3. Register: wheel type, six digitals
4. Frame: molded aluminum alloy
5. Braking component: Al, Ni, Co double-pole magnet, has two types of dividing magnet including adjusting board type and adjusting screw type
6. Driving component: unitary rivet type voltage steel core, revolving phase plate type phase adjustment, handle type and adjusting screw type light load adjustment
7. It is designed as per the most advanced technique with reasonable construction, beautiful appearance, stable performance, low consumption, and high overload of 6.67 times load

Technical parameter:
Accuracy class: class 2 for mechanical meter class 1 or 2 for electronic meter
Reference voltage: 110V, 120V, 220V, 230V, 240V
Frequency: 50Hz or 60Hz
Basic (max. rated) current: 15 (60) A, 10 (60) A, 150 (100) A, 20 (120) A
Voltage circuit consumption: ≤1W, 6VA
Current circuit consumption: 2.5VA
Basic rotating speed: 9r/min
Torque: 4.0x10-4 N.m
Weight of meter: 1.5kg