Col linear Load Test 50kg--110pounds.
The Standard Voltage is 24 VDC when finished.
MOV Provides Reverse Current Protection.
Low Power,Environmental Protection.
Anti-Residual Magnetism Design.
Professional Design,  Dual Insulate Housing.
Shunt and Defend the Cigarette Door Automatically During the Fire Alarm.
CE Certificate. 

DH-503 is a mortise mount door holder.Feature of low power consumption makes it more environmental friendly and more durable. Build-out release button for testing and build-in MOV reverse current protection