The WB1GA048 is a low-consumption contactor coil from the Schneider TeSys range, designed for 48 V AC 50 Hz control circuits. It is the replacement coil for CV1B and CV3B contactors — if you are servicing one of those frames, this is the part that makes the magnet pull in.
Electrical Characteristics for the Panel Builder
At 68 °F (20 °C) the inrush power sits at 130...160 W, or 345...415 VA at 50 Hz with a 0.38 power factor. Once sealed, hold-in drops to 16...25 W (45...65 VA, PF 0.35). The coil resistance measures 1.32 Ω at the same temperature, and the closed-circuit inductance is 0.1 H. The control voltage limits are 0.85...1.1 Uc at 50 Hz, operational up to 131 °F (55 °C).