Momentary key switch slim stainless steel spring return with 2 keys
Roll over image to zoom in
Click to open expanded view

Momentary Key Switch – Slim Stainless Steel Spring Return Key Switch for Access Control & Automatic Doors

    £26.00 inc. VAT (£21.67 + VAT)

    In stock

    • Momentary spring return to centre
    • COM / NO / NC change-over contacts
    • Single pole switching
    • Rated 4A 125V AC or 28V DC, 2A 250V AC
    • Brushed stainless steel faceplate
    • Slim 44 x 115mm plate – fits narrow frames
    • Flush mount
    • Keyed alike – key number A126
    • 2 keys supplied
    • For automatic doors, maglocks & access control
    • In stock – fast 1–2 day UK delivery
    Wishlist
    Compare
    • Order by 1pm, sent same dayMon–Fri · FREE UK delivery on every order
    • 30-day returnsOn unused items
    • VAT invoiceWith every order
    • Secure checkoutCard, Apple Pay, Google Pay
    Not sure it fits? Send us a photo on WhatsApp

    Or call 0121 714 0770

    SKU: AF-KSM01 Category: Tags: , , , , , , , , , , ,

    This momentary key switch gives secure, key-operated control of automatic doors, magnetic locks and access control systems. Turn the key to send a signal, and the spring return mechanism brings it straight back to the centre position when you let go. With a slim brushed stainless steel faceplate measuring just 44 x 115mm, it fits neatly on narrow door frames, posts and mullions where a standard switch will not.

    Because the switch only operates while the key is held, this momentary key switch is the ideal choice for temporary activation – such as opening an automatic door for a delivery, releasing a maglock out of hours or giving staff a key override on an access controlled door. Only people with a key can operate it.

    Why choose this momentary key switch?

    • Spring return action: the key automatically returns to centre when released – no risk of the door being left switched.
    • COM / NO / NC change-over contacts: wire it normally open or normally closed to suit your system.
    • Single pole switching: simple, reliable wiring for door controllers and lock power supplies.
    • Generous contact rating: 4A at 125V AC or 28V DC, 2A at 250V AC.
    • Brushed stainless steel faceplate: durable, professional finish for commercial buildings.
    • Slim 44 x 115mm plate: perfect for narrow frames and restricted mounting locations.
    • Keyed alike, 2 keys supplied: key number A126, so spare keys and matching switches are easy to source.

    What can a momentary key switch control?

    • Automatic sliding and swing door operators (open, override or activation input)
    • Magnetic locks (maglocks) and electric locks via the lock power supply
    • Access control systems as a key override or request-to-exit input
    • Gate and barrier controllers
    • Roller shutter and door control panels needing a key-operated pulse

    It is used in shops, offices, schools, hospitals, care homes, warehouses and public buildings – anywhere a door needs secure, authorised operation. For general advice on securing commercial doors, see the police-backed Secured by Design guidance.

    Momentary key switch vs a latching key switch

    A latching (maintained) key switch stays in position until the key is turned back, which suits setting a door to “hold open” or “off”. A momentary key switch only gives a signal while the key is turned, then springs back. Choose momentary when your controller needs a pulse – for example to open an automatic door once, or to release a maglock for a set time. If you need Off / Auto / Hold Open settings for an automatic door, see our 3 position automatic door key switch in the access controls range.

    Momentary key switch specifications

    TypeMomentary key switch, spring return to centre
    ContactsCOM / NO / NC change-over, single pole
    Contact rating4A 125V AC or 28V DC, 2A 250V AC
    FaceplateBrushed stainless steel
    Faceplate size44mm W x 115mm H
    MountingFlush mount (can be fitted in a suitable surface box, not included)
    Keys2 keys supplied, keyed alike
    Key numberA126

    Installation

    Isolate the power before fitting. Mount the momentary key switch flush on the door frame, post or wall, and connect COM plus either NO or NC to the key switch, open or override input of your door operator, maglock power supply or access controller. Check the controller’s instructions to see which contact it needs. Installation should be carried out by a competent installer in line with current wiring regulations.

    Frequently asked questions

    Does this momentary key switch stay on when I take the key out?
    No. It is spring return, so it only operates while the key is turned and returns to centre when released.

    Will it work with my automatic door?
    In most cases, yes. Most automatic door operators have a key switch or open input that accepts a momentary volt-free contact like this one.

    Can I use it to release a maglock?
    Yes. Wire it to the exit or override input of your maglock power supply or access controller, and the lock releases when the key is turned.

    Are the keys the same as other switches?
    The switch is keyed alike to key number A126, so all switches with the same key number open with the same key.

    Why buy from All Fitting Hardware?

    • In stock with fast 1–2 day UK delivery
    • Free UK delivery on every order
    • VAT invoice with every order
    • Easy 30-day returns on unused items
    • Expert help on 0121 714 0770 or WhatsApp

    Order your momentary key switch today. Need a touch-free exit as well? Add our touchless exit button, or browse all access control products.

    Related products

    Main Menu