ABB MPEK4-11R Electronic Motor Protection Relay

ABB MPEK4-11R is a red emergency stop switch with a 40 mm mushroom head, designed for panel mounting in industrial safety circuits where a clear, tactile stop point is essential for safeguarding machinery. The official ABB catalog reference is 1SFA611525R1101, and this variant is non-illuminated, relying on its conspicuous red color and large mushroom actuator rather than LEDs to signal an emergency stop. The unit ships without a contact block, so you’ll pair it with a compatible block as needed to complete the control circuit. It features a key-release mechanism, meaning the stop can only be reset with the supplied key, adding tamper-resistance in safety-critical environments. Suitable for safety circuits in industrial machinery and equipment that require a fail-safe stop, the MPEK4-11R is a robust option when a non-illuminated emergency stop with key-release is desired.