Alarm Controls System Accessories - Flat Key Switches

Three different switch actions in the KA Series flat key switch family. The KA-109 is an on/off (maintained) switch with a single bitted flat key. The KA-110 is momentary, also single bitted, so the contact only makes while the key is turned and springs back. The KA-111 is SPDT with a double bitted flat key, giving you both a normally open and a normally closed contact off one switch. All three come with two keys.

Depends on whether you want the door to stay unlocked. A momentary switch like the KA-110 breaks the circuit only while the key is held over, so the maglock re-energizes as soon as you let go, which suits normal entry. A maintained on/off switch like the KA-109 holds the state until someone turns the key back, which is what you want for unlocking a door for a delivery window or business hours. The KA-111 is SPDT, so use it when you need to switch one circuit off and another on at the same time.

A flat key switch like the Alarm Controls KA Series comes with its own bitted flat key and two keys in the box, which is the quick, self contained option when the switch does not have to match anything else. If you want the switch to take the same keyway as the rest of the building's locks, a cylinder style unit such as the Securitron MK Standard Mortise Cylinder Keyswitch accepts a mortise cylinder so it can be keyed into your existing system. Where you also want a push plate for accessible operation alongside the key control, the MS Sedco 830 Series combination keyswitch and push plate switch handles both in one device.

The KA-109 is an on/off keyswitch operated by a single bitted flat key and supplied with two keys, with screw terminal connections. The Securitron MK is a standard mortise cylinder keyswitch, so it is built to accept a mortise cylinder rather than being supplied with its own flat key. If a facility already standardizes its access control keys on a mortise cylinder keyway, the MK lets that cylinder carry over; if the opening just needs a self-contained switch with keys in the box, the KA-109 covers it.

For keying to an existing building cylinder, look at the Securitron MK standard mortise cylinder keyswitch, which is designed around a mortise cylinder your locksmith can supply and key into the facility system. The Alarm Controls KA series flat key switches use their own bitted flat key supplied two per switch, and they can be ordered keyed alike across multiple switches by adding A to the model, but that keying is within the flat key system rather than a building master key system.

Screw terminals on the KA Series flat key switches, with two exceptions: the KA-111 and KA-111A come with 8 inch color coded wire leads instead. So if you are splicing in a back box rather than landing wire under screws, the KA-111 is the one already set up for it.

Key removal position depends on the model. These flat key switches are supplied with a bitted flat key that is removable in ON or OFF, and which positions allow removal varies by model in the KA lineup. If you need the key out while the door is being held unlocked, confirm the specific model you are ordering supports removal in that position before you spec it.

The MS Sedco 830 Series offers a combination keyswitch and push plate switch for low voltage device activation, putting key control and a push plate actuator in one device. The Alarm Controls KA-109, KA-110 and KA-111 flat key switches are key-only devices, so a push plate for general users would have to be a separate item alongside them.

Within the Alarm Controls flat key switches, the KA-110 is the momentary version with a single bitted flat key and two keys, where the KA-109 is the maintained on/off model. If you need a transfer contact instead, the KA-111 is an SPDT switch with a double bitted flat key. The MS Sedco 830 Series is a combination keyswitch and push plate switch for low voltage device activation, which is a different form factor if you also want a push plate on the wall.

Do not assume it is a like for like swap. The KA-111 is an SPDT keyswitch supplied with 8 inch color coded wire leads, while the other KA flat key switches use screw terminals. The Securitron MK is a mortise cylinder keyswitch and needs a mortise cylinder to operate, which the KA-111 does not. Confirm the contact arrangement your control circuit expects and the cylinder supply before swapping between the two.

Yes, the KA Series flat key switches are commercial grade door hardware, used as access control switches for maglocks, electric strikes and similar low voltage devices. They are the type of device an MRO or security integrator installs for staff released doors and after hours unlock control.

No. Every KA Series flat key switch ships with two keys as standard, so a spare is in the box. Single bitted keys come with the KA-109 and KA-110; the KA-111 uses a double bitted flat key.