The Plc Kid
Member
@ The OP
You need to be using semiconductor fuses to protect your SSR's. Normaly fust even a fast acting is not fast enough to protect the SSR from a fault. Most SSR manufactures spec several fuses that should be use with the corresponding model.
I use watlow here and they have a fuse spec for each SSR size.
As OkiePC said you need a shunt trip or mechanical contactor ahead of each SSR or zoned that will open on a shorted SSR. many higher end SSR have built in short notification adn the TC can be used for this by setting limts based on rate of change in temp Vs time and by detecting current after SSR and comparing with control signal for SSR.
You need to be using semiconductor fuses to protect your SSR's. Normaly fust even a fast acting is not fast enough to protect the SSR from a fault. Most SSR manufactures spec several fuses that should be use with the corresponding model.
I use watlow here and they have a fuse spec for each SSR size.
As OkiePC said you need a shunt trip or mechanical contactor ahead of each SSR or zoned that will open on a shorted SSR. many higher end SSR have built in short notification adn the TC can be used for this by setting limts based on rate of change in temp Vs time and by detecting current after SSR and comparing with control signal for SSR.
