[Amps] Solid state relays and step start

[Larry]

Gary,

No problems here. Been using them in that application for more than 8 
years now with no problems. I have a two-stage step start which has two 
series resistors. The SS relays (zero crossing) short each one 
sequentially, in approximately 30 mS steps. Probably a worst case 
situation for those SS relays. The "mains" relay is a DPST mercury job.

73, Larry - W7IUV


On 04-Mar-10 12:53 PM, Gary Schafer wrote:
> Has anyone had problems using a solid state relay to short out the step
> start resistor in a power supply?
>
> I have heard of problems of not enough current thru the SS relays (when amp
> is in standby) when used as the primary on/off relay. Sometimes a resistor
> has to be placed in parallel with the transformer primary so the relay works
> properly.
>
> When used in a step start circuit the current could be quite low as well as
> the voltage at the relay due to the resistor across the relay.  Any issues
> here?
>
> 73
> Gary  K4FMX
>
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