The WB1JB431 is a TeSys-series contactor coil designed specifically for Schneider Electric CV1B and CV3B contactors. It is a low-consumption coil accepting AC/DC control voltage, meaning it draws less from the control transformer than a standard coil — a useful detail when the control circuit is already loaded with PLC outputs or pilot devices.
Schneider Electric has marked the WB1JB431 as obsolete. No official successor order code has been published for this coil. If you are holding a machine with a failed WB1JB431, the contactor itself (CV1B or CV3B) may still be available new; the coil is the constrained item.
The coil is listed as low consumption and AC/DC, so it will work on either 50 Hz or 60 Hz control circuits without a separate rectifier. The TeSys range is a well-documented family; if you have the contactor nameplate in hand, verify the coil code stamped on the old part matches WB1JB431 before ordering a replacement. The single-unit packaging (1 per package) is typical for service parts — no bulk reel.