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Internal of the 41A

ultrasonic

By ultrasonic

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One zone cct, one shunt, bell relay, key switch with solenoid to avoid setting in fault, or when call alarm engineer shows (auto dialer reset)

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© ultrasonic

From the album:

OLD alarm Equipment details

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Jack b

This is class to take a look at. Always loved the shorrock gear, finally obtained one of their bell box's recently too.

 

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Jack b

I have just noticed that the keyswitch is missing the plastic arm that pushes the Microswitch in, and that also allows the solenoid to lock the key switch

 

 

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