Solid state relay, 3 phase, load current 25A, DC-AC, equipped with LED indicator, zero-crossing switch, built-in RC, fast switching speed, high reliabilty and efficiency, widely used in the automatic control areas.
3 Phase SSR-25DA Specification
|On-state voltage drop
|Off-state leakage current
||2500V AC (1min)
||500МΩ with 500V DC
||Need heat sink for cooling
Solid State Relay Dimensions
Three Phase SSR Wiring Diagram
Tips: Single-phase solid state relay and three-phase solid state relay
Single-phase solid state relay is a four-terminal active device, two of which are input terminals and the others are output terminals. Photo isolation lies between them. Once the input terminal is given DC or pulse signals to a certain current value, the output terminal can be changed from off-state to on-state.
The three-phase AC solid state relay integrates three single-phase AC solid state relays, and directly switches over three-phase load such as AC electrical machine, heater, etc. through a single input to achieve convenient control. The insulation voltage between each phase, input and output, solid state relay and baseplate is greater than 2 000 V AC. The other basic indicators are the same as corresponding single-phase solid state relay. It should be pointed out that in some cases such as laboratory teaching where actual load current is not large, three-phase SSR is more convenient to use. But large current leads to more heating. At this moment, three single-phase solid state relays may be more reliable.