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. Specification: Item Type: Fire Electromagnetic Door Holder Material: Aluminum Alloy Rated Working Voltage: DC24V Current: 80mA Power Consumption: ≤ 2W Suction Force: ≥500N Remaining Magnetism: ≤3N. Package List: 1 x Fire Electromagnetic Door Holder1 x Suction Plate8 x Screw8 x Expansion Screw