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Product Details

DC Reversing Solid State Contactor 10A-500A 100V-1200V

  • Transformer isolation between input and output circuits.
  • Light-emitting diode indicates forward and reverse status.
  • Changing the control power terminal allows easy switching of load voltage polarity.
  • Internal control functions such as interlock and time delay are provided for safe and reliable switching.
  • Because the switching switch is a SCR, it is fast, noiseless and spark-free when switching.
  • The product is mainly used for frequent switching of singlephase DC motor forward and reverse rotation, switching of semiconductor refrigeration and heating, and other DC load power polarity conversion.



Maximum output voltage


Max. output current


On-state voltage

≤2~8 V

Control voltage

12 to 24 VDC.

Control current

60-100 MA

Switching time

≤ 0.3S

Off-state voltage


Off-state current

≤ 10 MA

Isolation voltage

≥1800 V

Adiabatic voltage

≥2000 V

Insulation resistance

≥100 MΩ

Operating Temperature


Heat dissipation conditions

≥20A with heat sink, ≥30A plus fan strong cooling

Safety factor of load current

≤2KW motor according to the rated current 2.5-4 times, > 2KW motor according to the rated current 4-6 times

Dimension (code)

105×74×41 mm; 120×84×56mm

Notes on product selection:

According to the size of the load power, different current margin should be selected. The larger the power, the larger the current margin. Generally choose the current capacity of solid state relay is 3-6 times of the load current. In addition, add overcurrent protection to the load circuit to prevent short circuits. The method is: the load circuit is connected in series with a fast circuit breaker or fast fuse.

In the output circuit, overvoltage protection measures should be added. Method: output parallel connected varistor (MOV), or add RC resistive capacitive absorption circuit. MOV: 440V power supply select 470V ~ 680V, 660V gear select 1100 ~ 1200V. Or with the factory's AC overvoltage protection absorber. Overcurrent protection method: Connect a quick disconnect switch or quick fuse in series with the load circuit.

If the load power supply is taken from the AC power supply through rectification into DC pulsating power supply, the filter capacitor must be added at the power end for filtering. The size of the capacitance is determined by the size of the load current.

According to the size of the selected solid state relay current, working mode, environmental conditions, the choice of heat sink should be different, the area of the heat sink should be large rather than small.

When installing, it is required that the contact surface between the heat sink and the product shall be flat and smooth, and a layer of thermally conductive silicone grease shall be applied to its surface, and finally the screws set with flat washers and spring washers shall be tightened and fixed symmetrically.

The control terminal is equipped with interlock and time delay functions, so there is no need to attach relevant protective measures when using.

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