Feature 1 Automatic Closing Operation: The fire fighting electromagnetic door holder is designed for emergency escape, automatically closing the door in case of fire, special electrician magnet, no residual magnetism in case of power failure. 2 Manual Release: The fire protection electromagnetic door holder is equipped with a manual closing release button, automatic closing of the door in case of fire smoke can be cut off, the power supply to make the fire door closed again. 3 Aluminum Alloy: The fire fighting electromagnetic door holder is made of aluminum alloy, sturdy and durable, with layered inner cavity structure, the maximum suction force can be up to 80Kg. 4 Pure Copper Enameled Wires: The interior of the electromagnetic door holder uses pure copper enameled wire winding, which is resistant to high voltage and improves working efficiency. 5 Scientific Design: The fire solenoid door holder adopts excellent components, scientific design, simple wiring, only need to access the positive and negative electrodes to energize.Item Type: Fire Electromagnetic Door HolderMaterial: Aluminum AlloyRated Working Voltage: DC24VCurrent: 80mAPower Consumption: 2WSuction Force: 500NRemaining Magnetism: 3N Package List1 x Fire Electromagnetic Door Holder1 x Suction Plate8 x Screw8 x Expansion Screw