Best For: Fire and smoke doors in commercial buildings, schools, hospitals and public facilities requiring a 150mm floor-mounted magnetic holder that releases when power is removed.
FSH 35770/150/90 Magnetic Door Holder – 150mm Extension, 40kg, 12V DC
The FSH 35770/150/90 Magnetic Door Holder is a heavy-duty electromagnetic hold-open device designed for fire and smoke doors. Its 150mm extension and 90-degree configuration allow the holder to be surface-mounted to the floor where additional distance is required between the door and mounting position.
Providing up to 40kg holding force, the door holder keeps a compatible door securely open during normal building operation. When power is removed by the connected fire or smoke alarm system, the magnetic hold releases so the door closer can return the door to its closed position.
This fail-safe operation helps support a building’s fire and smoke containment strategy by allowing doors to close automatically following an alarm, power failure or other emergency release signal.
Key Features of the FSH 35770/150/90
- Heavy-duty electromagnetic fire-door holder
- 150mm extension arm
- 90-degree configuration for floor mounting
- Up to 40kg holding force
- 12V DC operation
- Approximately 100mA current consumption
- Fail-safe release when power is removed
- Designed for compatible fire and smoke doors
- Titanium alloy surface finish
- Suitable for commercial and public buildings
- Fire tested for up to four hours, subject to the approved installation
- Two-year manufacturer warranty
How the Magnetic Door Holder Works
During normal operation, the building’s control system supplies power to the magnetic door holder. When the door is opened, the armature plate engages with the magnet and holds the door in the open position for pedestrian and general traffic.
When the connected fire or smoke alarm system activates, power is removed from the holder. The armature plate releases, allowing the door closer to return the door to its closed position.
This method allows fire and smoke doors to remain open during everyday use without preventing them from closing during an alarm.
150mm Extension with 90-Degree Mounting
The 150mm extension provides additional reach where the magnetic holder cannot be installed directly beside the door. The 90-degree configuration is intended for floor-mounted installations, allowing the magnet to align with an armature plate fitted to the door.
This configuration is useful where wall mounting is impractical or where the open door position requires the holder to extend above the floor surface.
Designed for Fire and Smoke Doors
The FSH 3500 Series is designed for projects where fire and smoke doors must remain open for pedestrian movement but close automatically when an emergency signal is received.
Typical installations connect the magnetic door holder to a building fire indicator panel, smoke detection system or approved door-release controller. The complete system must be configured so power is removed from the holder when the doors are required to close.
Technical Specifications
| Brand |
FSH |
| Model |
35770/150/90 / FSH35770/150/90 |
| Series |
FSH 3500 Series |
| Product Type |
Heavy-duty electromagnetic door holder |
| Application |
Compatible fire and smoke doors |
| Holding Strength |
Up to 40kg |
| Operation |
Power to hold / fail-safe release |
| Input Voltage |
12V DC |
| Current Consumption |
Approximately 100mA at 12V DC |
| Extension Length |
150mm |
| Configuration |
90-degree extension |
| Mounting |
Floor surface mount |
| Approximate Overall Dimensions |
117mm D x 90mm W x 176mm H |
| Surface Finish |
Titanium alloy finish |
| Fire Testing |
Tested for up to four hours, subject to the approved doorset and installation |
| Warranty |
Two years |
12V and 24V Model Selection
The 35770/150/90 is the 12V DC version of this magnetic door holder. Installations requiring 24V DC should use the corresponding 35771/150/90 model.
The control voltage should be confirmed before ordering to ensure compatibility with the fire panel, door-release controller and building power supply.
Ideal Applications
- Commercial fire and smoke doors
- Hospital and healthcare corridors
- Schools and education facilities
- Office building passageways
- Apartment common areas
- Shopping centres and retail facilities
- Government and council buildings
- Public buildings with high pedestrian traffic
Fire-System Integration
A magnetic fire-door holder must be connected to an appropriate fire or smoke alarm control system. The system must remove power from the holder when the door is required to close.
The magnetic holder does not close the door itself. A correctly selected and adjusted door closer is required to return the released door to its closed and latched position.
Professional Installation Required
The FSH 35770/150/90 should be installed by a qualified fire, electrical, access control or door hardware professional. The installer must confirm the mounting position, armature alignment, power supply, fire-system connection and door-closer operation.
Fire testing and compliance apply to approved configurations. Suitability for a particular fire or smoke door should be confirmed with the doorset supplier, fire contractor, certifier or manufacturer before installation.
Why Choose the FSH 35770/150/90?
- Designed specifically for fire and smoke door hold-open applications
- Strong 40kg magnetic holding force
- Fail-safe release when power is removed
- 150mm extension for flexible positioning
- 90-degree configuration for floor mounting
- Suitable for high-traffic commercial environments
- Designed for integration with building fire and smoke systems
Shop CTC Communications for quality FSH electronic door hardware, electric door locks and accessories for commercial access control and fire-door applications.
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