Why Choose the ABB MKey8ER 24VDC Safety Interlock Switch?
The ABB MKey8ER 24VDC, part number 2TLA050015R0132, is a robust mechanical safety interlock switch with guard locking and emergency escape release designed for monitoring doors, hatches and movable guards on industrial machinery. Featuring a die-cast housing and head, 24 V DC power-to-unlock operation and a high 2000 N holding force, it provides dependable guard locking for machinery where access must remain prevented until a safe unlocking signal is given.
As part of the ABB Jokab Safety MKey series, the MKey8ER monitors both the position of the actuator and the status of the locking mechanism. Its contact arrangement incorporates 2NC actuator-monitoring contacts and 2NC lock-monitoring contacts with positive force disconnection, together with auxiliary NO contacts for guard-open and lock-status indication.
A key feature of the MKey8ER is its manual escape release button, which can allow the locking mechanism to be released from inside the guarded area in an emergency when incorporated into an appropriately assessed safety system. The switch also provides IP67 protection, three M20 conduit entries and is supplied with a standard actuator key.
Key Advantages
- Heavy-duty safety interlock switch with electromagnetic guard locking.
- 24 V DC power-to-unlock operation for safety-locking applications.
- High 2000 N holding force for securely retaining machine guards.
- Integrated emergency escape release accessible from inside the guarded area when correctly installed.
- 2NC + 2NC positive-opening safety contact arrangement for actuator and lock monitoring.
- Robust die-cast housing and head with IP67 protection.
Key Features
- ABB Jokab Safety MKey8ER guard-locking safety interlock switch.
- 24 V DC electromagnetic solenoid.
- Power-to-unlock locking principle.
- 2000 N guard holding force.
- 2NC actuator + 2NC lock-monitoring safety contacts.
- Two auxiliary NO circuits for guard-open and lock-status indication.
- Manual emergency escape release at the rear of the housing.
- Three M20 conduit entries for wiring.
- IP67 enclosure protection.
- Standard actuator key supplied.
Safe Guard Locking with Emergency Escape Release
Guard-locking interlock switches such as the ABB MKey8ER are used where a movable machine guard must remain locked until access can be permitted safely. The actuator key is mounted on the movable guard and enters the switch head when the guard closes, while separate positively operated contacts monitor the actuator position and locking mechanism.
The MKey8ER adds an important escape-release function for applications where personnel could potentially enter the guarded area. When installed according to the machine risk assessment, the rear manual release can be positioned so that it is accessible from inside the active guarded area, allowing the locking mechanism to be manually released and the guard opened in an emergency.
Typical Applications
- Robot cell access doors and perimeter guarding.
- Machine guards requiring safety locking.
- Automated production and assembly machinery.
- Packaging and processing equipment.
- Conveyor and material handling systems.
- Guarded areas where an internal emergency escape release is required.
