Allen-Bradley 150-C37NBD Industrial Relay Module

Allen-Bradley 150-C37NBD is a Bulletin 150 SMC-3 soft starter for three-phase motors, designed to operate on 480V AC three-phase power and rated for about 37 A of motor current (37NBD designation reflects the nominal current class). The unit provides reduced-voltage starting and stopping to limit inrush current and mechanical stress during motor ramp-up and ramp-down. Its control circuit is described as TB-97, TB-98 (OLFD): Electromagnetic relay for auxiliary contacts, enabling overload/fault signaling within the starter’s control wiring. As part of the SMC-3 family, the 150-C37NBD is intended for use in industrial motor control where controlled acceleration and protection of the driven equipment are required.