Emergency Break-Glass Door Release: Why Access-Controlled Doors Need One
Short answer: an emergency break-glass door release is a wall switch next to an access-controlled door that cuts power to the electric lock when someone breaks or presses its panel, so people inside can get out even if the card reader, exit button or controller has failed. Every door that people must escape through and that is held by a fail-safe lock, such as an EM lock, should have one. On our store the GBS-44 break-glass release costs ₹950 and a pack of 10 EMG-SW emergency release buttons costs ₹2,499.
Why does an access-controlled door need an emergency release?
An access control door is only as reliable as its weakest part. The normal way out is the exit button, which tells the controller to release the lock. But if the controller hangs, the exit button wire is cut, or the reader is damaged, the door can stay locked with people behind it. In a fire, smoke or a panic, nobody has time to call the technician.
The break-glass release removes that risk. The GBS-44 listing describes it as connected in series with the electric lock's power, specifically so that a failure of the card reader, button or controller cannot trap people inside. It works on its own, without the controller's permission.
How does a break-glass door release work?
- Normal state. The release switch's contacts are closed. Power flows from the power supply, through the switch, to the EM lock, and the door stays locked.
- Someone breaks or presses the panel. The contacts open and break the lock's power circuit.
- The lock releases. An EM lock is fail-safe: with no power it has no holding force, so the door opens with a push.
- Staff reset it. After the emergency, the panel is reset or replaced as the model requires, and the lock is powered again.
Because the switch sits directly in the lock's power line, it still works if the controller is dead, frozen or wrongly programmed. That independence is the whole point.
Which locks does it work with?
- Fail-safe locks (release when power is cut): EM locks and fail-safe drop bolts. A break-glass release in series opens these immediately. This is the right setup for escape routes.
- Fail-secure locks (stay locked when power is cut): some strike locks and electronic rim locks. Cutting power does not open them, so a break-glass in series does nothing useful. Do not use fail-secure locks on doors people must escape through.
Our EM lock vs drop bolt guide explains fail-safe and fail-secure in more detail, and the exit switch guide compares push buttons, no-touch sensors and break-glass units side by side.
Where should you fit it?
- Inside, beside the door, on the side where the door opens, within easy reach of a standing adult.
- In plain sight. Not behind a curtain, display stand or file rack. Label it "Emergency door release".
- On every access-controlled escape door: office main doors, server rooms people work in, clinic and lab doors, shop glass doors, society lobby doors.
- Close to the exit button but separate from it, so staff do not confuse the daily button with the emergency one.
How to wire and test it
- Switch off the access control power supply.
- Run the lock's positive wire from the power supply to the release switch, and from the switch on to the lock, using the contacts that are closed in normal state.
- Leave the controller's lock relay in the circuit as before, so normal card and button operation is unchanged.
- Power on and confirm the door locks.
- Operate the release and confirm the door opens with a push, with the controller still powered.
- Reset it and confirm the door locks again.
- Repeat the test regularly and record it. Use a trained electrician or access control installer for the wiring.
If your building has a fire alarm, the installer can also make the alarm release the locks. The AGNI 4-zone fire alarm panel we sell lists relay outputs for fire and fault that can be used to drop lock power on alarm; the break-glass unit stays as the manual backup at the door.
Emergency release and related products on our store
| Product | What the listing states | Use | Price |
|---|---|---|---|
| GBS-44 Emergency Door Release Break Glass | Connected in series with the lock power; works if reader, button or controller fails; fire-proof plastic shell | Emergency release on any access-controlled escape door | ₹950 |
| EMG-SW Emergency Release Button, pack of 10 | 12V DC, 3A contacts, NO/NC/COM outputs; also usable as panic or doorbell button | Offices or hostels with many doors (₹250 per button) | ₹2,499 |
| EM-602 EM Lock 600 lbs | Single-leaf electromagnetic lock, 600 lbs | Fail-safe lock for wooden, metal or glass doors with the right bracket | ₹1,499 |
| PK-80 Access Control Power Supply | 12V 3A output, AC 110–240V input | Powering the lock, reader and release circuit | ₹1,450 |
| SSW-412P Exit Push Button | Stainless steel, 3 × 1 inch, 3A 36V DC | Daily exit button beside the release | ₹490 |
| Combo-CN41 Glass Door Access Kit | RFID and PIN reader, 600 lbs EM lock, U bracket, K80 supply, PVC button, 10 key tags | New toughened glass door setup | ₹5,450 |
Adding a GBS-44 to a door you already have costs ₹950. A new toughened glass door with the CN41 kit plus a GBS-44 comes to ₹6,400 at today's prices. A pack of 10 EMG-SW buttons brings the cost down to ₹250 a door for larger sites. Browse Exit Switches and Emergency Door Release and Complete Door Access Control Kits, or put a door together in the access control kit builder. For keeping locks powered and safe during power cuts, see the access control power supply guide.
FAQ
What is a break-glass emergency door release?
It is a wall switch beside an access-controlled door that cuts power to the electric lock when its panel is broken or pressed. With a fail-safe lock such as an EM lock, the door then opens with a push.
Why is an emergency release needed if there is already an exit button?
The exit button usually works through the controller. If the controller, reader or button wiring fails, the door may not open. The break-glass release cuts lock power directly, so it still works.
Does a break-glass release work with every electric lock?
It works with fail-safe locks that release when power is cut, such as EM locks. Fail-secure locks stay locked without power, so they should not be used on escape doors.
Where should the emergency door release be installed?
Inside, next to the door, at a height a standing adult can reach easily, clearly visible and labelled. Fit one on every access-controlled door on an escape route.
Is a break-glass door release the same as a fire alarm call point?
No. A fire alarm manual call point signals the fire alarm panel. A door release cuts power to a door lock. They look similar, so label each one clearly.
What is the price of an emergency door release switch?
On our store the GBS-44 break-glass release costs ₹950, and a pack of 10 EMG-SW emergency release buttons costs ₹2,499, including GST.
Prices are NavKar Systems website prices on 27 October 2026, inclusive of GST, and may change.
