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delay cutoff circuits.... 1

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MichaelWhite

Electrical
Joined
Dec 23, 2003
Messages
2
Location
NZ
Hi im designing a circuit that will eventually allow us to control a motor via a switch that when activated will shut the motor down after 5 seconds if the switch is held open and will then stay shut down untill another push button is hit.

so far i have come up with an RC circuit that works well but im having issues with isolating the RC control circuit from the motor contactor becaure of the inductor

I am interested in wether a Solid state relay would work for this or do they have inductance on the control side?

help !
 
Suggestion: The Solid State Relay (SSR) might be used depending on its design that would include isolation between its input and the output switching part. The schematic diagram of the solid state relay is needed assess the isolation. The timing on the SSR input side must be compatible with the SSR input parameters.
 
thanks for the info

so a SSR is an optoisolated voltage controlled voltage source with very little input impedance?

if so then thst would be perfect.
 
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