Alarm Controls MCK-2-4 MCK Series 1.75" Mortise Cylinder Key Switch, DPDT Alternate, Green LED

Optimize access control and frontline security with the Alarm Controls by ASSA ABLOY MCK-2-4 mortise key switch. Designed for commercial security, surveillance and monitoring applications, this DPDT alternate key switch provides dependable toggle control — each key turn alternates the circuit for secure locking or equipment activation. The stainless steel wall plate accepts a standard 1-1/8" mortise cylinder (sold separately) for a clean, professional fit, while tamper-proof screws protect against unauthorized removal. A bright green LED, operable on 12 or 24 volts AC/DC, gives clear status feedback for operators and monitoring stations. With contacts rated at 4A @ 28VDC, the MCK-2-4 integrates easily into access control panels, alarm systems and door hardware. Manufactured by Alarm Controls (ASSA ABLOY) in the U.S., it’s built to meet the rigorous demands of security installers and facilities managers. Ideal for doors, gates, and control cabinets — add the MCK-2-4 to your next access control or surveillance deployment.

• Secure DPDT alternate action delivers reliable, tamper-resistant on/off control for doors, locks and alarm circuits
• Green LED status (12/24V AC/DC) gives instant visual confirmation for monitoring and surveillance systems
• Heavy-duty stainless steel wall plate accepts standard 1-1/8" mortise cylinders for durable, professional installations
• Tamper-proof and slotted screws minimize unauthorized service and simplify maintenance
• 4A @ 28VDC rated contacts enable straightforward integration with access control panels and security equipment