Allen-Bradley 160 MMB1 MOV Module

The Allen-Bradley 160-MMB1 MOV Module is a Metal Oxide Varistor (MOV) protection unit designed for use with the Bulletin 160 family of controllers. It provides surge protection for the controller’s I/O network and field devices by clamping transient voltages that could damage downstream circuitry in industrial panels. Listed alongside other MOV protective modules in Rockwell’s 160-series catalog (such as 160-MMA1), the 160-MMB1 is installed in compatible 160-series chassis as part of a legacy protection scheme. Its function is to enhance system reliability in harsh industrial environments by mitigating voltage spikes that could otherwise stress or damage automation electronics. Typical applications include protection of control panels, wiring runs, and device inputs within legacy Allen-Bradley automation installations.