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The mini SS unit is used where the key needs to remain trapped until an electrical signal has been received and where space is limited.

The MSSR unit is used where the key needs to remain trapped until an electrical signal has been received and where space is limited.  When the signal is received the push button illuminates.  On pressing the illuminated button the key is released.

The SS unit is used where the key(s) need(s) to remain trapped until an electrical signal has been received. SS-B - Solenoid Controlled Key Switch (back of board), SS-F - Solenoid Controlled Key Switch (in enclosure)

The SLS device ensures that keys may not be released until both the solenoid has been energised and the control power has been isolated.

The SSR unit is used where the key(s) need(s) to remain trapped until an electrical signal has been received.