GEOFIRE 3-87-0551 Doormouse Wall Mounted Electromagnetic Fire Door Holder | 500N, Zero Residual Force
£29.23 (inc VAT: £35.08)
Key features
- 500N holding force for heavier fire doors
- Zero residual force via spring-loaded release pin
- Surface or back cable entry knockouts
Downloads
Summary
The Geofire Doormouse 3-87-0551 is a wall mounted electromagnetic fire door holder built to hold open heavier fire doors, offering 500N of holding force rather than the lighter-duty force found on standard door holders. If you’re specifying a holder for a dense timber or steel-faced fire door, this extra holding capacity means you’re not fighting door closers or risking a holder that lets go under its own weight.
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That higher force rating saves you a return visit to site if a lighter holder proves inadequate on a heavier door set, and it widens the range of doors you can confidently spec with a single product family. On alarm, power to the unit is simply cut, letting the door’s closer take over and shut the door automatically.
You get a spring-loaded pin that gives zero residual holding force when de-energised, so there’s no magnetic drag left on the door once the alarm triggers. An integral manual release button also lets you close the door on site without having to operate the fire alarm system.
Features
- 500N holding force - secures heavier fire doors that lighter holders may struggle to retain
- Zero residual holding force - spring-loaded pin ensures a clean release with no drag on the door
- Surface or back cable entry knockouts - wire the unit either way depending on site conditions
- Integral manual release button - close the door on site without triggering the fire alarm
- Supplied with adjustable keeper plate - ready to fit without sourcing a separate plate, with low profile and chain keeper options available if needed
- Low power rating of 1.15W - light load on the 24Vdc supply and fire alarm control unit
- Approved to EN1155 and CE marked - meets the recognised standard for fire door holding devices
Specifications
| Part Number | 3-87-0551 |
|---|---|
| Supply Voltage | 24Vdc |
| Holding Force | 500N |
| Power Rating | 1.15W |
| Residual Holding Force | Zero |
| Ambient Temperature | 0 - 40°C |
| Protection Rating | IP51 |
| Casing | White fire-resistant ABS |
| Weight | 500g |
| Approvals | EN1155, CE marked |
FAQ
The Doormouse 3-87-0551 is supplied with an adjustable keeper plate as standard. If the door sits further from the wall than the standard plate can reach, a low profile 500N keeper plate or a chain keeper (with 1m of chain supplied) are available separately to suit the holding force. Yes, the chain keeper accessory is designed for exactly this situation, connecting the door holder to the door via a mounting plate and chain rather than a rigid keeper plate. No, the unit uses a spring-loaded pin that gives zero residual holding force once de-energised, so the door is free to close under its own closer without any magnetic drag. Yes, the Doormouse has an integral manual release button on the casing, letting you release and close the door on site independently of the alarm system. This SKU is the 24Vdc version only. Confirm your fire alarm control unit’s output voltage and current capacity before wiring to make sure it matches a 24Vdc supply. Based on the manufacturer’s part number listing, UL listed versions are only offered in the 200N holding force option, not the 500N. If UL listing is a requirement for your project, you’ll need to specify the lower force variant instead.What keeper plate comes with this unit, and can I fit a different one?
Can I mount this where the door is recessed or set well back from the wall?
Will the door stick to the holder after the alarm has cut power?
Can I close the door manually without setting off the fire alarm?
Does this unit run on 230Vac as well as 24Vdc?
Is a UL listed version of this 500N holder available?
Downloads
- Datasheet (Adobe PDF)
Additional information
| Weight | 0.36 kg |
|---|---|
| Device Type | |
| Mounting | Door |
| Holding Force | 500N |
| Voltage | 230V AC |
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