Re: Timer problems

[Rick Hughes <richardh@xxxxxxx>]

I used these a lot in my previous life and they are expensive but quiet
in operation. The zero volt switching cuts down on interfernce as well.
We dis have quite a number of failures where it was impossible to turn
them off, guess it is the thyristors in them going u/s.

Rick

Stuart Johnson wrote:
>
> Thanks Nigel/Keith,
>
> The Solid State Relays look cool, especially since they have zero volt
phase
> switching.  Considerably more expensive once you add a power supply
&
> heatsink though.  :-(
>
> Food for thought anyway. Ta.
>
> Stuart.
>
> I was going to suggest a contactor but Nigel beat me to it  :-)))
>
> As an alternative...how about a Solid State Relay.
> Farnell do SSR's capable of switching 25A 600V with a 1 second
overload
> rating of 64A and a single cycle surge of 175A.
>
>
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