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Subject: Solid State Relay Problems

Date: 12/06/99
Posted by: Simon Kelly
E-mail: skelly(at)themutual(dot)net(no spam)
URL: http://


I am having some problems with solid state relays, they are turning a contactor coil on and off. The ssr's have replaced existing mechanical relays, the reason for the change was because of new test parameters that now mean the supply voltage could be anywhere between 110-240VAC. The supply signal for the ssr's are stated as 80-260VAC and the o/p @ 280VAC (my output load is 240VAC). One circuit works ok most of the time but the other circuit does not switch off when the supply is cut to the ssr - I have checked the ssr to be working and also checked the circuit by putting the mechanical relay back in. Is alternative method of helping the ssr to switch and remain off? I have very little experience of these devices and would welcome any comments. Thanks in advance SK

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