Solid State Relay, 3 phase, load current 40A, DC to AC, zero-cross switch, built-in RC, LED indicator. SSR features optical isolation, no electric spark, no noise, no contact, high switching speed, high reliability, long lifespan, wide applications.
3 Phase SSR-40DA Specification
|On-state voltage drop
|Off-state leakage current
||2500V AC (1min)
||500МΩ with 500V DC
||Need fan for cooling or water cooling
Solid State Relay Dimensions
Three Phase SSR Wiring Diagram
Tips: Thermal design and radiator selection of solid state relay
There is certain internal power dissipation in solid state relays’ operation. The dissipation value is mainly determined by product of output voltage drop and load current, embodied in the form of heat radiation. The quality of heat dissipation directly affects maximum load current of solid state relays and maximum allowable temperature of the working environment and it is one of the important factors that affect the reliable operation of SSRs. Therefore, we should pay attention to thermal design and radiator selection so that SSRs may work reliably and failure of and damages caused by poor heat dissipation to solid state relays can be avoided.
In general, solid state relays, whose output current is less than 5A, use natural convection air enough to achieve the purpose of cooling, but when installed, solid state relays need a good convection environment and the space between each solid state relay should not be less than the width of a SSR. It is essential for those solid state relays with a load current greater than 10 A to use suitable radiators, even forced air cooling (air speed at 6 m/s) or water-cooling if necessary. The good heat dissipation condition is very important for SSRs’ reliable work.