For a guard-locking solution that offers reliability, resilience, and simplicity use the Prosafe 440T SBLE series Interlock Switches by Allen Bradley Guardmaster.

The Prosafe switches provide sequential access control, isolating the power supply to equipment when the gate or door is open. With Prosafe switches the new keys are fully compatible with old style barrels, however old keys do not fit the new barrels. These safety switches ensure secure trapped key interlocking for protective housings, sliding doors and switches and electrical cabinet break switches. They feature a direct drive control mechanism.

Key must be ordered separately:
394-7564 - Key A
394-7570 - Key B

Standards: EN 292 and EN 1088

The Prosafe 440T-MSBLE100A is a single key bolt safety interlock switch. This mechanical switch offers excellent stability and security for your machine guard. The key must be trapped to withdraw the bolt. The bolt is 14mm (0.55in) when extended.

• Robust 316L stainless-steel construction for optimal durability
• Single key unit
• Tamper resistant screws
• Direct drive push/pull operation – rugged and dependable
• Weatherproof stainless-steel dust cap
• Replaceable code barrel assembly

The Prosafe range of products have been extensively tested for quality and durability, working seamlessly for 100,000 operations. They are also highly tamper-resistant, accepting only the original or equivalent new key for operation. Allen Bradley Guardmaster have one of the broadest portfolios in the industry for machine monitoring and locking products, which ensures that you can create your ideal guarding system and keep your operations running smoothly.

A trapped key interlock is a simple sequential mechanical safety system for machine guards whereby a removable key is trapped in a control device while the power supply is running. Only when the power supply is turned off can the key can be rotated in the lock and withdrawn. While it is removed the power supply is isolated, ensuring that the machine cannot be restarted while the guard door is open. The key can then be used to release the machine guard, allowing access to the machinery. After the guard is closed it can be removed and inserted back into the original control unit, thus allowing the power supply to be activated again. They can withstand harsher environments than electrical interlocks and are often used in industrial settings where serious risk of injury can occur to machine operators.

Trapped Key Switch