3 Phase DC-AC SSR Solid State Relay

DC to AC three phase solid state relay is a non-contact switch composed of microelectronic circuits, discrete electronic devices, and power electronic power devices. The isolation device is used to realize the isolation between the control terminal and the load terminal. The input end of the solid state relay uses a tiny control signal to directly drive a large current load. ATO manufacturer provides you high reliability and general purpose SSR relay for wide applications. 3 phase solid state relays with 3-32V DC control voltage, 24-480V AC load voltage, LED indicator and panel mount, optional load current of 10A, 25A, 40A, 60A, 80A, 100A, 120A.

3 phase DC-AC SSR solid state relay

Three Phase SSR Features



Voltage Type: DC to AC

Load Voltage: 24-480V AC

Control Voltage: 3-32V DC

Max. Input Current: 20mA

Must Operation Voltage: 4V DC

Must Release Voltage: 2.7V DC

Max. on-State Voltage Drop: 1.5V

Peak Voltage: 800V AC

Load Current: 10A, 25A, 40A, 60A, 80A, 100A, 120A

Operation Temperature: -20℃~ 80℃

Max off-State Leakage Current: 8mA

Dielectric Strength: 2500V

Certification: CE, CCC, TUV, UL


Dimension (Unit: mm)

3 phase SSR dimensions

Wiring Diagram

3 phase SSR wiring diagram 3-32VDC

Tips: How to protect SSR relay?

  • Overcurrent protection. SSR is a semiconductor power device, which is extremely sensitive to temperature changes, and overcurrent will damage the SSR, usually using a fast fuse. However, it is necessary to understand its protection characteristics, know the relationship between its fuse current and time, and correctly select the fast fuse that is compatible with the SSR's nominal current.
  • Add RC absorption circuit. Adding RC loop not only has the effect of preventing overvoltage, but also is good for improving dv/dt. It is recommended that R is 20-100Ω, power is 2-5W, C is 0.1-0.47uf, and withstand voltage is 250-630v. SSR nominal current is small, R takes the upper limit of 100Ω, C takes the lower limit of 0.1uf, otherwise, R takes the small value, C takes a large value.
  • Overheating protection. The SSR is overheated and its characteristics are degraded. If it is out of control, it will cause permanent damage. It is recommended to install a temperature control switch near the SSR bottom plate, and the temperature control point is 75 to 80 °C.
  • Inductance L is connected in series in the inductive load. In inductive loads, the SSR is usually damaged due to the high rate of change of current di/dt. The amount of L inductance depends on the size and cost.
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