Description

The ABB MCBH-20 is a modular contact block providing two normally open (N.O.) contacts in a single module, for use with ABB M2 series pushbutton components within the MCBH stacking contact block range. The dual N.O. configuration enables a single operator action to simultaneously switch two independent circuit paths, making the MCBH-20 ideal for applications requiring redundant run signalling, dual PLC feedback inputs, multi-circuit enable functions, or parallel motor control commands. Rated to IEC 60947-5-1, it delivers reliable contact switching performance in industrial and commercial control circuit environments.

The MCBH-20 uses screw terminal connections for both contact circuits and is rated for AC-15 and DC-13 utilisation categories per IEC 60947-5-1. Its two-N.O. configuration is particularly efficient for applications where the same pushbutton action must activate two separate control functions, such as simultaneously sending a run signal to a motor starter and a feedback signal to a SCADA or BMS system. The module is compatible with the MCBH-00 holder and can be stacked with other MCBH contact blocks to build up higher contact-count operator assemblies.

Used widely in industrial control panel construction, machine operator interface design, and process plant local control station assembly, the MCBH-20 allows panel builders and machine builders to create multi-output pushbutton assemblies without requiring external auxiliary relays or additional panel real estate. As part of ABB’s M2 modular operator system, the MCBH-20 ensures dimensional and functional compatibility with the full range of M2 actuators and operator devices, supporting flexible and efficient operator interface design for a wide range of industrial and commercial control applications.