Door magnet Hekatron THM 439/18 490N 63mA — holding force 490 N, coil current 63 mA

Hekatron THM 439/18 is an electromagnetic door holder designed to maintain doors in a closed position until a compatible control unit issues a release command. The unit delivers a rated holding force of 490 N with a coil current of 63 mA, offering reliable retention for fire doors, access control doors and other applications where secure magnetic holding is required. The device is suitable for fixed mounting on door frames and mating plates on doors, and is intended for integration with building safety and access control systems.

Advantages

The door magnet provides a consistent holding force of 490 N while operating at a low coil current of 63 mA, allowing energy-efficient continuous use. Its electromagnetic operation ensures a controlled release when connected to standard fire alarm or access control units. The compact design supports straightforward installation on a variety of door types and the construction materials are chosen for long-term mechanical stability and dependable magnetic performance.

Suitable for

• Fire doors requiring controlled magnetic hold-open function
• Access control doors in commercial and residential buildings
• Doors in corridors, stairwells and escape routes where retention until activation is needed
• Integration with fire alarm control panels and release units

Key specifications

• Rated holding force: 490 N
• Coil current: 63 mA
• Operation: electromagnetic door holder for controlled release
• Mounting: surface mounting on frame with mating armature plate on door
• Typical applications: fire door retention, access control hold-open

How to use

Mount the magnet securely to the door frame and attach the included armature plate to the door leaf so that the magnet and plate align when the door is in the held-open position. Wire the coil to a compatible control unit or fire alarm release circuit following local electrical and fire safety codes. Verify alignment and holding force during commissioning and adjust the armature plate position if necessary to ensure full contact and reliable retention.

Recommendations

Use with compatible control and release units certified for fire safety systems. Perform periodic inspection of mounting hardware, electrical connections and armature plate contact to maintain rated holding performance. Do not exceed the specified holding load; ensure the door and fittings are suitable for the magnet’s holding force.