Safety interlock switch with solenoid

17 June 2019

IDEC Corporation has released of its new HS1T interlock switch with solenoid. This interlock switch is said to deliver 5,000N of locking force. It includes features that help maximise protection in machine and equipment guarding applications.

Many applications which require interlock switches have to endure high vibration, thrown debris, physical abuse and even bypass attempts, so they need to have a high locking force. 

The HS1T delivers 5,000N of locking force which has been achieved in such a compact unit size thanks to its design – with a metal head integrating the locking and mounting functions – offering improvements over older designs where the head could break away from the mounting body. Also, to maximise installation options, the remaining actuator portion can be independently rotated from the high-strength head using only one screw. With a slim form factor and so many mounting options, the HS1T can be installed almost anywhere.

Much of the strength of the unit is provided by the metal head, but cam design also plays an important role. IDEC has included three independent rotary cams, instead of the single cam used by conventional devices. Two cams control the locking mechanism and one drives the door monitor contact. This arrangement provides redundancy, additional strength and ensures the monitoring function continues to work even if a locking cam is damaged.

The HS1T meets the requirements of ISO 14119:203 for Lock Monitoring. This means both the status of the position and the locking function of a protective door can be monitored through the lock monitoring contact. The net result is that fewer on-board contacts are needed to achieve redundant safety circuits and additional monitoring circuits, reducing the amount of wiring on the device. For additional integrity, the device structure is designed so the lock monitoring contact can never indicate closed if the door is not positively closed, thereby preventing the associated machine from being turned on with risks exposed.

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