The Schneider Electric WB1KB125 is a replacement contactor coil from the TeSys range, designed specifically for CR1B contactors (models.31.32.33). This is the part you need when the coil on a CR1B fails and you want to keep the existing contactor base rather than swapping the whole assembly. The coil accepts a wide control voltage range — 257...280 V AC at 50-400 Hz, or 222...243 V DC — making it suitable for panels with mixed AC/DC control supplies. It's a low-consumption design, drawing only 0.15...0.2 W hold-in power on a single-pole configuration, which keeps the control transformer lightly loaded.
Electrical Fit — What the Ratings Mean
The control voltage range is the critical fit parameter. The WB1KB125 pulls in on 257-280 V AC or 222-243 V DC, so verify your panel's control supply matches one of those bands. The inrush power hits 380...520 W on a single-pole configuration, dropping to the low hold-in figures once the contactor seals — the control transformer must handle that momentary surge. Heat dissipation varies by pole count: 7...10 W for 1P, up to 35...45 W for 4P at 50-400 Hz. If the coil lives in a densely packed enclosure, that heat adds up — account for it in your thermal budget. Not a high-cycle solenoid, but adequate for standard motor starting or resistive load switching.