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Used for a number of purposes for instance to override an access control system and leave a door under manual control or to control a motorised roller shutter or powered door operator but can also be used to restrict use of machinery by keyholders only.
Momentary operation keyswitches are normally used where the key is required to turn the switch to another position only for as long as the user holds the key in this position. The key cannot be removed from the switch to lock in that position. Release the key and the key "springs back" to the normal position (where the key can be removed)
Maintained keyswitches are used where the key is required to turn the switch to another position permanently and allows the key to be removed from the switch to lock in that position.
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