ASEA RK637001-AB RQBA 040 PLC Relay Module

The ASEA RK637001-AB RQBA 040 PLC Relay Module is a 40-output Combiflex relay module designed for ASEA Combiflex backplane systems. Identified by the RK637001-AB and RQBA 040 designators, this module slides into a compatible Combiflex rack to provide discrete relay switching controlled by a compatible PLC CPU. The 040 suffix denotes a 40-relay configuration, enabling the board to drive a wide array of external devices without taxing the main controller. In typical automation setups, it is used to switch solenoids, indicators, contactors, or other line-level loads under PLC logic, with isolation between the controller and the switched circuits to protect the control system from load transients. The combination of a robust Combiflex form factor and ASEA/ASEA lineage makes it a common choice in legacy and retrofit installations where an existing Combiflex shelf is already in service. For precise electrical ratings, coil voltages, contact configurations, and mounting details, consult the official RK637001-AB data sheet and compatible backplane specifications from the manufacturer or an authorized distributor.