ABB mkey9 24vdc Safety Interlock Switch

Why Choose the ABB MKey9 24VDC 2TLA050007R0112 Safety Interlock Switch?

The ABB MKey9 24VDC Safety Interlock Switch 2TLA050007R0112 is a robust guard-locking safety interlock switch designed for monitoring hinged, sliding and removable machine guards. Part of the ABB Jokab Safety MKey range, this model uses a spring-locking mechanism with 24 V DC power-to-unlock operation, helping prevent access to hazardous machinery until the safety system permits the guard to be opened.

The MKey9 combines a durable polyester housing with a 316 stainless steel head and provides IP67 enclosure protection for demanding industrial environments. A rotatable head provides eight actuator entry positions, giving machine builders flexibility when installing the switch around different guard-door arrangements. This 2TLA050007R0112 version is supplied with a standard stainless steel actuator key.

With a 24 V DC solenoid, 12 W solenoid power consumption, 1 × M20 conduit entry and guard locking force of 1800 N, the MKey9 provides a substantial guard-locking solution for industrial machinery. When correctly incorporated into an appropriate safety architecture, the switch can support safety functions up to PL e / Category 4 according to EN ISO 13849-1 and SIL 3 according to EN 62061.

Key Advantages

• Spring-lock, power-to-unlock operation helps keep guards locked when the solenoid is de-energised.
• Robust polyester housing and 316 stainless steel head for industrial applications.
• 1800 N guard locking force provides secure mechanical guard retention.
• Eight actuator entry positions simplify installation on different guard configurations.
• IP67 protection provides resistance to dust and water ingress.
• Supports safety architectures up to PL e / Category 4 and SIL 3.
• Standard stainless steel actuator key included.

Key Features

• ABB MKey9 guard-locking safety interlock switch.
• Spring-locking operating principle.
• 24 V DC power to unlock.
• 12 W solenoid power consumption.
• 1800 N guard locking force.
• Rotatable stainless steel head with 8 actuator entry positions.
• Standard stainless steel key included.
• 1 × M20 conduit entry.
• IP67 enclosure classification.
• Positive-opening travel of 10 mm.
• Maximum actuator approach/withdrawal speed of 600 mm/s.
• Mechanical B10d reliability of 2.5 × 10⁶ operations at 100 mA load.

Reliable Guard Locking for Industrial Machine Safety

Guard-locking interlock switches are used where opening a machine guard before hazardous movement has stopped could expose personnel to unacceptable risk. The ABB MKey9 uses a spring-applied locking mechanism, meaning the guard remains mechanically locked when the solenoid is de-energised and requires the appropriate 24 V DC signal to permit unlocking.

Its robust construction, high locking force and flexible actuator-entry arrangement make the MKey9 suitable for a wide variety of industrial guard doors. Combined with appropriately designed ABB safety relays, safety controllers or other compatible safety control equipment, it can form part of a high-performance machine safeguarding system.

Typical Applications

• Guard doors around hazardous industrial machinery.
• Robot and automated manufacturing cells.
• Packaging and processing machinery.
• Conveyor and material handling equipment.
• Machines with run-down time requiring guard locking.
• Sliding, hinged and removable safety guards.
• Automated production and assembly equipment.