2TLA050003R0120 ABB MKey5Z Stainless Steel Safety Interlock Switch 12N

Why Choose the ABB MKey5Z 2TLA050003R0120 Safety Interlock Switch?

The ABB MKey5Z 2TLA050003R0120 is a robust mechanical safety interlock switch with a stainless steel head and body, designed for monitoring machine doors, guards and hatches. As part of the ABB Sensors/Switches product group, it uses a separate key actuator mounted on the moving part of the guard to provide positive mechanical guard-position monitoring.

This full stainless steel MKey5Z version provides a 12 N holding force and features 2NO + 1NC contacts with the guard open. The switch includes three M20 conduit entries for flexible field wiring and is supplied with a standard stainless steel actuator key, providing the main components required for a conventional tongue-operated guard interlock installation.

With IP67 and IP69K protection, the MKey5Z is particularly well suited to demanding industrial environments where a stainless steel safety switch is preferred. When correctly incorporated into an appropriate safety architecture, the MKey5 series can support safety functions up to PL e / Category 4 and SIL 3.

Key Advantages

• Full stainless steel head and body for robust industrial machine-guard applications.
• 12 N holding force helps retain the actuator in the switch during normal guard operation.
• 2NO + 1NC contacts with the guard open provide multiple circuits for safety and status functions.
• Positive mechanical actuation provides reliable guard-position monitoring.
• Three M20 conduit entries provide flexible cable-entry options.
• Supplied with a standard stainless steel actuator key.
• IP67 and IP69K environmental protection suits demanding industrial installations.
• Can support safety architectures up to PL e, Category 4 and SIL 3 when correctly integrated.

Key Features

• ABB MKey5Z safety interlock switch.
• ABB order code 2TLA050003R0120.
• Stainless steel switch body.
• Stainless steel switch head.
• 12 N holding force.
• 2NO + 1NC contacts with guard open.
• 3 × M20 conduit entries.
• Standard actuator key supplied.
• Positive-opening mechanical guard-monitoring principle.
• IP67 / IP69K protection.
• Suitable for doors, hatches and movable machine guards.
• Alternative actuator keys are available for different installation requirements.

Positive Mechanical Guard Interlocking with the ABB MKey5Z

A key-operated safety interlock switch monitors the position of a movable machine guard using a separate actuator key. The MKey5Z switch body is mounted to the fixed part of the machine, while the actuator is mounted to the moving door, hatch or guard. Closing the guard inserts the actuator into the switch head and operates the safety contacts; opening the guard withdraws the actuator and positively changes the relevant contact state.

The MKey5Z is an interlocking switch rather than a powered guard-locking device. Its 12 N holding force provides actuator retention during normal operation but should not be confused with a high-force safety locking function. Its stainless steel construction and IP67/IP69K protection make it particularly useful where a durable mechanical interlock is required in demanding machinery and production environments.

Typical Applications

• Machine guard door monitoring.
• Safety gate interlocking.
• Access hatch monitoring.
• Removable and movable machine guards.
• Food and beverage processing machinery.
• Packaging and production equipment.
• Automated manufacturing and assembly machinery.
• Material handling and conveyor systems.
• Industrial environments requiring stainless steel switch construction.
• OEM machinery using mechanical key-operated safety interlocks.