The GD870S Door Retainer is a fire-rated electromagnetic door holder designed to safely hold open fire doors during normal operation and automatically release them when connected fire alarm systems activate. Also known as a fire door holder, fire door hold open device, or electromagnetic door holder, the GD870S provides a reliable solution for fire door management in commercial, educational, healthcare, and public sector buildings.
Designed for integration with fire alarm systems, the GD870S allows fire doors to remain open for convenience and accessibility. Upon activation of the fire alarm system, power is removed from the magnet, allowing the door closer to automatically close the fire door and help prevent the spread of smoke and fire throughout the building.
Manufactured with a durable white powder-coated finish and tested to BS EN 1155 for electrically powered hold-open devices, the GD870S provides dependable performance and long-term reliability. The integrated override switch allows local release of the retained door when required, making it suitable for a wide range of fire door applications.
Available Models
- GD870S-12 – 12VDC Surface Mounted Fire Door Retaining Magnet
- GD870S-24 – 24VDC Surface Mounted Fire Door Retaining Magnet
Key Features
- Surface mounted door retaining magnet
- Suitable for fire door hold-open applications
- Operating voltage 12VDC or 24VDC
- Holding force up to 100lbs (45kg)
- Integrated override release switch
- Durable white powder-coated finish
- Electrically tested to BS EN 1155
- Suitable for connection to fire alarm systems
- Reliable automatic door release operation
- Suitable for commercial and public buildings
Typical Applications
- Fire doors
- Smoke control systems
- Commercial buildings
- Office buildings
- Schools and educational facilities
- Healthcare environments
- Hotels and hospitality venues
- Public buildings
- Corridors and escape routes
- Assisted access environments
Compatibility
The GD870S is designed to integrate with a wide range of fire safety and door control equipment.
- Fire alarm systems
- Fire doors
- Door closers
- Smoke control systems
- Building management systems
- Emergency door control systems
- Access control systems
- Life safety systems
- Power supplies
Technical Specification
- Product Type: Door Retaining Magnet
- Operating Voltage: 12VDC or 24VDC
- Holding Force: Up to 100lbs (45kg)
- Mounting Type: Surface Mount
- Override Switch: Integrated
- Finish: White Powder-Coated
- Hold-Open Device Testing: BS EN 1155
- Dimensions: 80mm x 80mm x 61mm (H x W x D)
The GD870S Door Retaining Magnet provides a reliable solution for controlled fire door hold-open applications. Featuring BS EN 1155 testing, an integrated override release switch, durable powder-coated construction, and compatibility with fire alarm systems, it is ideal for buildings requiring safe and controlled fire door management.
Frequently Asked Questions
What is the GD870S used for?
The GD870S is used to hold fire doors open during normal operation and automatically release them when a fire alarm system is activated.
What is a door retaining magnet?
A door retaining magnet, also known as a fire door hold open magnet, fire door retainer, or electromagnetic door holder, is used to hold a fire door open during normal operation and automatically release it when the fire alarm system activates, allowing the door to close safely.
What holding force does the GD870S provide?
The GD870S provides a holding force of up to 100lbs (45kg).
Can the GD870S operate on both 12VDC and 24VDC?
Yes. The GD870S is designed to operate on either 12VDC or 24VDC power supplies.
Does the GD870S include a manual release function?
Yes. The unit includes an integrated override switch that allows local release of the retained door.
Is the GD870S suitable for fire door applications?
Yes, the GD870S has been tested to BS EN 1155 for electrically powered hold-open devices and is designed for fire door hold-open applications
Can the GD870S be connected to a fire alarm system?
Yes. The GD870S is designed to work with fire alarm systems so that doors automatically close when an alarm is activated.