Schmersal has released the smallest electronic solenoid interlock in the world with the AZM40. Featuring an integrated radio frequency identification (RFID) based safety sensor, it’s suitable for hinged, sliding, or angled doors and machine covers.

It has dimensions of 119.5x40x20mm and mounting holes placed centrally in the housing to match the channel in typical extruded profiles for guard doors. There are two types of finishes for the screw boreholes, countersunk or flat. Countersunk are tapered at 45° and allow for the screws to rest flush with the housing. The flat finish (PH) allows the flat-headed screws to protrude.

It’s ideal for machines and work cells where access to a hazardous work area must be controlled until safe conditions are met.

The solenoid lock provides 2000 N to secure the machine guard until dangerous conditions, which may exist immediately after removal of power, have abated. The solenoid lock may be controlled by a time delay, motion detector, position sensor or other suitable components.

The AZM40 works on the bistable principle: In the event of a power cut, it retains the current position. This ensures safe operation, whatever the status of the machine.

Even if there are hazardous run-on movements, the safety door remains safely locked in the event of a power failure. Another advantage of the bistable principle is the consistently low energy consumption, as the interlock only requires power when the door is to be locked or unlocked.