ABB mkey8 24vdc Interlock Switch, 2NC+2NC

Why Choose the ABB MKey8 2TLA050011R0132 Safety Interlock Switch?

The ABB MKey8 2TLA050011R0132 is a heavy-duty solenoid safety interlock switch with guard locking designed for monitoring and controlling access through movable machine guards, doors and hatches. As part of the ABB Jokab Safety MKey series, it combines mechanical guard position monitoring with a robust locking mechanism for machinery where access must remain prevented until hazardous movement or processes have stopped.

The MKey8 uses a spring-to-lock, power-to-unlock operating principle. The guard is mechanically locked by spring force and the solenoid is energised from a 24 V DC supply when unlocking is permitted. This safety-locking principle helps keep the guard locked if electrical power is lost and makes the MKey8 particularly suitable for machinery with run-down times or other hazards that remain after a stop command.

With a rugged die-cast housing and die-cast head, 2000 N holding force and IP67 protection, the MKey8 is engineered for demanding industrial installations. It features separate safety contacts for monitoring the locking mechanism and actuator position, three M20 conduit entries and a rotatable head with multiple actuator entry positions for flexible mounting on industrial guards.

Key Advantages

• Heavy-duty solenoid safety interlock switch with guard locking.
• 24 V DC power-to-unlock operation with spring-applied locking.
• 2000 N holding force provides robust mechanical guard retention.
• Separate 2NC safety contacts for lock monitoring and 2NC safety contacts for actuator monitoring.
• Durable die-cast housing and head for industrial applications.
• IP67 protection and three M20 conduit entries support installation in demanding machinery environments.

Key Features

• ABB Jokab Safety MKey8 series.
• 24 V DC solenoid with power-to-unlock operation.
• 2NC + 2NC safety contact arrangement for guard and lock monitoring.
• 2000 N maximum holding force.
• Die-cast housing and die-cast head.
• IP67 enclosure protection.
• Three M20 conduit entries for electrical connections.
• Supplied with a standard stainless steel actuator key.

Reliable Guard Locking for Hazardous Machinery

Solenoid safety interlock switches combine guard position monitoring with mechanical locking to help prevent personnel from opening a protective guard while hazardous machinery remains active. The ABB MKey8 is mounted on the fixed machine structure while its separate actuator key is installed on the movable guard, allowing the safety system to monitor both the position of the guard and the status of the locking mechanism.

The MKey8 uses a spring-to-lock, power-to-unlock mechanism. When the actuator enters the switch and the locking mechanism engages, the guard can be retained with a holding force of up to 2000 N. The 24 V DC solenoid is energised when controlled unlocking is required, making the MKey8 suitable for machinery where access must remain restricted until a safe condition has been confirmed.

Typical Applications

• Industrial machine guard doors and access gates.
• Machinery with hazardous run-down or stopping times.
• Robot cell and automated equipment enclosures.
• Packaging and production machinery.
• Conveyor and material handling safety systems.
• OEM machine-building and factory automation installations.