This article was machine-translated from French and is being reviewed. Prices are in Algerian dinars excl. VAT.
Electromagnetic lock (suction cup) or electric strike: the suction cup holds the door closed with an electromagnet and releases when power is cut. The electric strike replaces the lock’s strike plate and releases the bolt when commanded. What matters is what the door does during a power outage, and whether that door is used for evacuation.
In short
- Suction: a continuously powered electromagnet, free without power. Latch: mounted in the frame, either releasing or holding on power cut depending on the model.
- During a power outage, a battery‑free suction cup leaves the door open. An emission strike remains locked. On an evacuation exit, anyone inside must be able to leave at any time, without badge, code or power.
- 350 kg suction cup: about 8,000 DA HT alone, about 16,000 DA HT with its support (L‑bracket). In store (06/11/2026, in stock): ZKTeco 350 kg suction cup at 16,500 DA HT, CLEDOR GE54 latch at 5,800 DA HT.
Electro‑magnetic suction lock: the principle
The suction consists of an electromagnet fixed to the frame and a plate attached to the door. When closed, the plate touches the electromagnet and power keeps them together. Without power, the door is free. There is no moving part, and opening is immediate. The electromagnet consumes power as long as the door is locked.
Holding force is expressed in kgf, often written “kg”: 280 kg and 350 kg on our quotes. That is the value advertised by the manufacturer, for a perfectly plated plate and correct power supply. It does not indicate what the door and frame can support: their strength matters just as much.
The electric latch fits in the frame, replacing the mechanical latch. It releases the bolt of the door lock when commanded. A bolt on the door is therefore required.
Fail‑safe or fail‑secure: what does the door do without power?
Fail‑safe: without power, the door opens. Fail‑secure: without power, the door remains locked.
| Suction | Current‑releasing latch | Current‑breaking latch | |
|---|---|---|---|
| Without power | Door free | Door locked | Door free |
| With power | Door locked | Door released | Door locked |
| Consumption | Continuous, door locked | Brief, on opening | Continuous, door locked |
| Principle | Fail-safe | Fail-secure | Fail-safe |
During a power outage, a battery‑free suction cup lets everyone in. With an emission strike, the door stays locked, but a means to open from inside without power is required.
To keep a suction cup locked during an outage, add backup power. The 12 V 3 A backup supply costs 7,000 DA HT, delivered without battery, in stock as of 06/11/2026; the battery is quoted separately on a quote. The CLEDOR GE54 strike datasheet does not specify its mode (emission or power‑cut): confirm before buying.
Emergency exit and fire safety
A door on an evacuation route or emergency exit must never hold someone inside. A lock that remains active during a power outage or fire is dangerous. Therefore:
- With a suction cup: an emergency manual trigger (break‑glass button) near the door, wired into the suction cup power supply. It cuts power directly, even if the reader or exit button fails.
- If the building has a fire alarm: connect the lock to that alarm, so the door releases when the fire alarm triggers.
- With a backup power supply: the emergency trigger is essential on an evacuation exit. The battery keeps the door locked during a cut, so a reliable release method is required.
- With a push‑to‑open latch: a mechanical interior opening, by the handle or an anti‑panic bar, depending on the door lock.
Exact requirements depend on building type and public access. Have the device approved by the competent authority before installation.
Which lock for which door
- Single‑leaf solid door, well square : suction lock or latch.
- Double‑leaf door: two suction cups, one per leaf, or a latch on one leaf with the other leaf locked. On an evacuation exit, a locked leaf reduces passage width: have this choice approved.
- Glass door : one suction lock with a frame‑adapted support.
- Door that closes poorly : first adjust it and add a door closer. The suction lock only works if the plate touches the electromagnet.
- Fire‑rated door: do not drill or modify it without the door manufacturer’s consent, as this may void its fire rating.
Door accessories
The “quote” prices are rough estimates based on our quotes.
| Accessory | Role | Price (DA HT) |
|---|---|---|
| Suction cup support CM280BLZ (for the 280 kg) | Adapts the mounting to the door | 4,200 (quote, median; max 5,500) |
| DC80120 door closer, 80 to 120 kg (also called door return) | Re‑closes the door against the suction lock | 6,000 (quote, median; 4,500 to 8,800) |
| MT‑INT02 no‑touch push button | Opens from inside, contactless | 3,100 (online shop, in stock) |
| 12 V 3 A power supply | Powers the lock | 6,500 (store, in stock) |
| Emergency manual trigger (break‑glass) | Cuts power to the suction cup in an emergency | On quote |
With a suction cup, the exit button cuts power for an instant. The store door closers (ZKTeco 40 and 65 kg at 5,900 DA HT, GROUME 85 kg at 6,500 DA HT, ZKTeco 120 kg at 8,800 DA HT) were out of stock on 06/11/2026.
Price of the suction cup and latch
Store price on asloitech.com as of 06/11/2026, subject to availability. “Quote” lines follow the same note.
| Lock | Price (DA HT) | Source |
|---|---|---|
| ZKTeco 350 kg suction cup, with its support | 16 500 | Store, in stock |
| 280 kg CM280 suction cup, alone | 7,300 (max 8,600) | Quote, median |
| 350 kg LM-3505 suction cup, alone | 8,710 (max 18,000) | Quote, median |
| CLEDOR GE54 latch | 5 800 | Store, in stock |
| AL135NC latch | 8,500 (min 5,445) | Quote, median |
350 kg suction cup: two prices, depending on what is counted. The suction cup alone costs about 8,000 DA HT: the median of our quotes for the LM-3505 is 8,710 DA HT. With its support (L‑bracket), it costs about 16,000 DA HT, and the shop lists 16,500 DA HT for the ZKTeco 350 kg. The difference of about 16,000 − 8,000 = 8,000 DA HT is therefore that of the support, not a more powerful suction cup. Always compare suction cups with the same perimeter: alone, or with their support.
A 280 kg suction cup with its support costs 7,300 + 4,200 = 11,500 DA HT. The ZKTeco 350 kg with its support (16,500 DA HT) costs 16,500 − 11,500 = 5,000 DA HT more. With a door closer, the 280 kg costs 11,500 + 6,000 = 17,500 DA HT. The GE54 latch costs 5,800 DA HT, which is 11,500 − 5,800 = 5,700 DA HT less than the 280 kg suction cup with support. But it assumes a latch on the door, which this calculation does not include, nor the frame cut. Prices change: ask for today’s price.
Frequently asked questions
280 kg or 350 kg suction cup?
In our quotes, the 350 kg LM-3505 costs 8,710 − 7,300 = 1,410 DA HT more, median, than the 280 kg CM280: these are two suction cups alone, without support. With their support, the difference rises to 5,000 DA HT (see above). Choose the force based on the door and frame, not just the price.
Is a door closer needed with a suction cup?
Yes, generally. Without a door closer, the door may stay ajar and the plate does not touch the electromagnet.
How to open from inside?
With a suction cup, use an exit button near the door. On a backup exit, add the emergency manual trigger: the exit button alone is insufficient, as it can fail like any electronic device. With a push‑to‑open latch, the handle or lock opens without power, depending on the door lock. For a backup exit, have the device approved.
To choose your door lock, request a visit via our page access control and time clock or browse the access control store. The price of an access control for one door details the cost of a complete door.