Description

The ABB M2SSK1-301 is a 2-position, non-illuminated, maintained-action key selector switch with a short handle and chrome metal bezel, forming part of ABB’s M2 22 mm modular operator device range. The key-operated mechanism provides an additional level of access control, ensuring that the switch can only be operated by personnel in possession of the correct key. This makes the M2SSK1-301 particularly suitable for applications requiring controlled access to operational modes, safety override functions, or restricted area control switches in industrial machinery and process plant environments.

Compliant with IEC 60947-5-1, the M2SSK1-301 is designed for standard 22 mm panel mounting and is supplied without a contact block, allowing the user to attach ABB MCB or MCBH contact block modules to build the required circuit switching configuration. The maintained action ensures the switch remains in the selected position after the key is removed (subject to the key-lock design), providing reliable mode selection or access-controlled enable functions. The chrome metal bezel provides mechanical robustness and a premium appearance for front panel installation.

The M2SSK1-301 is widely used in industrial machine control, process automation, building management systems, and security-sensitive control panel applications where key-controlled switching is required. As part of ABB’s M2 modular operator system, it is fully compatible with the range of MCB and MCBH contact block accessories, enabling flexible circuit configuration. Key selector switches are commonly used for maintenance mode enable, emergency override, local/remote mode selection, and other functions where unauthorised operation must be prevented.