The WB1EA400 is a replacement coil from the Schneider Electric TeSys range, designed specifically for the CV1B and CV3B contactor frames. It is a low-consumption AC coil rated at 400 V AC 50 Hz and 440 V AC 60 Hz, meaning it holds the contactor closed on a 50 Hz supply at 400 V and on a 60 Hz supply at 440 V — the two common line voltages across European and North American industrial plants. The coil draws an inrush of 90 to 110 W at 20 °C, settling to a hold-in consumption of 13 to 19 W at the same temperature, which keeps the thermal load on the panel wiring manageable provided the contactor is in a ventilated enclosure.
Electrical characteristics for the panel builder
The coil's average resistance is 182 ohms at 20 °C, and its closed-circuit inductance is 10 H. The control circuit voltage limits are 0.85 to 1.1 times Uc at both 50 Hz and 60 Hz, provided the ambient temperature stays below 55 °C. Inrush power in VA is 220 to 270 VA at 50 Hz and 225 to 275 VA at 60 Hz, with a power factor of 0.4 and 0.34 respectively. Hold-in VA drops to 35 to 55 VA at both frequencies. These numbers matter for sizing the control transformer and the fuse or circuit breaker feeding the contactor coil circuit — the inrush peak is brief but must not sag the control bus below the dropout threshold of other coils on the same circuit.