External dimensions Installation wiring diagram: (unit: mm)

Precautions for the application of JGT39 three-phase AC solid-state relay components:
Forced air cooling: When the surface temperature of the radiator exceeds 70 ℃ and it works for a long time, it is easy to cause relay overheating, breakdown, increased leakage current and other faults. In order to accelerate the heat dissipation speed, a powerful fan must be installed on the top of the cabinet. In addition, reasonable consideration should be given to the space allowance of the cabinet, the direction of the air duct, and the size of the air inlet and outlet to prevent heat from being unable to be discharged outside the cabinet.
45 ℃ fan self starting temperature control switch: When the surface temperature of the radiator exceeds 45 ℃, the switch will automatically turn on, and the axial flow fan will operate. Otherwise, it will automatically turn off. The selection of switch capacity depends on the power of the fan.
75 ℃ temperature protection switch: When the surface temperature of the radiator exceeds 70 ℃ due to faults in the fan and control fan circuit or unreasonable design selection, and reaches the limit temperature close to the relay's operation of 70 ℃~80 ℃, the temperature protection switch will automatically cut off the relay input control circuit and load current.

Installation method:
As shown in the figure, a layer of thermal conductive silicone grease (135 x or padded with thermal conductive film) should be evenly applied between the contact surface of the relay and the heat sink. M6 x 25mm screws and spring pads should be used, and both ends should be evenly applied with force to tighten the relay. When installing the kit, the exhaust direction should be from bottom to top. The cross-sectional area of power wires can be selected as 4-8A/mm2, and cold pressed terminals are required at the joint. And it must be tightly pressed to prevent contact resistance and heating after loosening. When applied in high temperature and high humidity environments, a layer of conductive paste should be applied to the terminal joint. Avoid electrochemical corrosion.