Re: Master Clock contact spark quenching


Simon Taylor
 

I did post this further up the thread...

 

"All of the contacts are made of 10% iridium and 90% platinum. The hipp toggle contacts pass between 400-500mA for the pendulum drive coil. Although running a GPO slave cct direct it is quite possible, I would still recommend using either traditional relay (coil 2000-5000 ohms) or a solid state device or arduino system."
Simon GPO Clocks
It was only after several years of service that the GPO switched to standard relays with a 5000 ohm coil, but the contact specifications never changed in case a replacement PO36 were to be installed on an earlier system with the 90A relays.

http://www.lightstraw.uk/gpo/clocksystems/index.html

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