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Electronic solenoid interlock is ‘the world’s smallest’

21 November, 2019

The German machine safety specialist Schmersal has developed an RFID-based solenoid interlock which it claims is the world’s smallest. Measuring 119.5 x 40 x 20mm, the AZM40 interlock is ideal for small safety doors and flaps.

Despite its compact size, the interlock can produce 2kN of force. The RFID technology results in a “high” coding level, offering increased tamper protection in accordance with DIN ISO 14119.

The Schmersal interlock operates on the bistable principle. If power is lost, it stays in position. This ensures safe operation, whatever the status of the machine. Even if there are hazardous run-on movements, the safety door will remain locked. Another advantage of the bistable design is low energy consumption, because the interlock needs power only when the door is locked or unlocked.

Thanks to the actuator’s 180° angle flexibility, it can approach the interlock on a stepless basis, making it suitable for flaps that do not close at 90° or those that open upwards to a 45° angle. This helps the interlock to fit into tight and hard-to-access spaces.

Schmersal claims its AZM40 electronic interlock is the world’s smallest

For applications with personnel protection (interlock monitored), the safety outputs are switched on when the safety door is closed and the interlock is locked. An actuator-monitored version can be used for applications with process protection. In this variant, the safety outputs are actuated as soon as the safety door is closed.

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