Re: Master Clock contact spark quenching

Simon Taylor

The contacts in the PO 36 were designed to 'wipe'. That is, that they continued to travel after contacting which led one to wipe over the other thus removing any oxide build up. I am not sure of the clock specifications, but for GPO 3000 relays, the contacts after meeting would then continue until a certain pre defined lift had carried the contacted spring clear of its buffer block (which it rested on) by a certain distance. this led to the contacts rubbing each other and so removing oxide build up.
Simon GPO Clocks

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