Geofire 3-87-0370 Doormouse Electro-Magnetic Fire Door Holder | 200N Holding Force, 24Vdc Supply
£51.76 (inc VAT: £62.11)
Key features
- Spring-loaded pin gives true zero residual holding force
- Knockouts for surface or back cable entry
- Integral manual release button for alarm-free closing
Downloads
Summary
The Geofire Doormouse 3-87-0370 is a wall mounted electromagnetic fire door holder built around a spring-loaded pin that delivers genuine zero residual holding force when de-energised, so the door swings free the instant power is cut rather than dragging against lingering magnetism. It’s designed for holding open fire doors on routes where easy access matters, from hospital corridors to hotel landings, while still allowing the door to shut automatically on its standard closer the moment the fire alarm activates.
View full overview Show less
For you on site, that clean release means fewer callbacks to doors that stick half-shut or need a manual shove to clear the frame, and less time spent explaining nuisance faults back to the client. It also keeps commissioning straightforward, since there’s no residual pull to test and tune out before sign-off.
The 3-87-0370 is the 24Vdc, 200N version, rated at 1.15W so it sits comfortably on a fire alarm control panel’s auxiliary output. It’s housed in a white fire-resistant ABS casing with knockouts for surface or back cable entry, and fitted with an integral manual release button so the door can be closed without tripping the alarm.
Features
- Zero residual holding force - spring-loaded pin releases the door cleanly with no lingering magnetism to work loose
- Dual cable entry knockouts - 20mm dia knockouts let you route cabling from the surface or back of the unit depending on the wall
- Integral manual release button - close the door directly without triggering the fire alarm system
- Low power draw - 1.15W rating keeps the load on the fire alarm panel’s auxiliary supply light
- Fire-resistant ABS casing - white surface-mounted housing suited to corridors and public access areas
- Approved to EN1155 and CE marked - meets the recognised standard for powered door holding devices
Specifications
| Part Number | 3-87-0370 |
|---|---|
| Supply Voltage | 24Vdc |
| Holding Force | 200N |
| Power Rating | 1.15W |
| Residual Holding Force | Zero |
| Ambient Temperature | 0 to 40°C |
| Protection Rating | IP51 |
| Casing | White fire-resistant ABS |
| Weight | 360g |
| Keeper Plate Supplied | Adjustable (standard) |
| Mounting | Wall mounted, surface fixed |
| Approvals | EN1155, CE marked |
FAQ
An adjustable keeper plate is included as standard. If the door sits too far from the holder for the standard plate to reach, a chain keeper is available separately and extends the reach using a 1m chain between mounting plate and keeper. No, the 200N rating is fixed by the magnet in this unit. What you can adjust is the keeper plate alignment itself, with the adjustable plate allowing up to 30 degrees of movement to compensate for door swing or minor misalignment. It’s rated IP51, which covers protection against dust and light dripping water, making it suited to indoor public access areas such as corridors and lobbies. It isn’t intended for direct outdoor exposure. The casing has 20mm dia knockouts that support either surface or back cable entry, so you can choose the route that suits the wall and existing containment on site. The Doormouse is designed to work with any suitable fire alarm system: power to the holder is simply cut when the alarm triggers, releasing the door to close on its own closer. Check your panel’s auxiliary output can supply the 24Vdc feed and the 1.15W load before specifying. Use the integral manual release button on the casing, which lets you close the door directly without operating the alarm system.What keeper plate is supplied with the 3-87-0370?
Can I adjust the 200N holding force on site?
Is this suitable for an exposed or outdoor-facing door?
How do I route cabling into the unit?
Will this work with our existing fire alarm panel?
How do I release the door without setting off the fire alarm?
Downloads
- Datasheet (Adobe PDF)
Additional information
| Weight | 0.36 kg |
|---|---|
| Device Type | |
| Mounting | Door |
| Holding Force | 200N |
| Voltage | 24V DC |
More Door Holder products from Geofire
Agrippa Chain Keeper
£24.01 (inc VAT: £28.81)
Agrippa Door Holder Extension Bracket
Agrippa Floor Mounting Bracket Kit
£9.68 (inc VAT: £11.62)
Agrippa Sound Activated Magnetic Fire Door Holder
£92.62
GEOFIRE 3-87-0551 | Doormouse Wall Mounted Electromagnetic Fire Door Holder | 500N, Zero Residual Force
£29.23 (inc VAT: £35.08)
GeoFire Weatherproof Door Holder
£145.46
Geofire Floor Mounted Fire Door Holder
