JR36 Thermal Overload Protection Relay

JR28 3 phase thermal overload relay is a series of thermal overload relays. Thermal overload relay is the application of current thermal effect principle, often used for AC motor or other electrical equipment and circuit overcurrent. JR28 3 phase thermal overload relay from ATO provider, rated operating current is available at 25A, 36A and 93A. The 3 phase thermal overload relay is equipped with a flame retardant shell to withstand wear and high temperature. JB28 series thermal overload relay with 380V rated operation voltage. Ambient air temperature of thermal over load relay between -5 ℃ and 40 ℃. Both wholesale and bulk, ATO as a supplier will be the most cost-effective choice.
JR36 thermal overload protection relay


Model ATO-JR36-20 ATO-JR36-63 ATO-JR36-160
Current 0.25-32A 14-63A 40-160A
Rated Insulation Voltage 690V 690V 690V
Open-Phase Protection Yes Yes Yes
Manual and Automatic Reset Yes Yes Yes
Temperature Compensation Yes Yes Yes
Test Button Yes Yes Yes
Installation stand-alone type stand-alone type stand-alone type
Auxiliary Contact 1NO+1NC 1NO+1NC 1NO+1NC
AC-15 380V Rated Current 0.47A 0.47A 0.47A
Traverse Cross-Sectional Area Main Loop Single Core or Stranded Wire 1.0~6.0mm2 2.5~16mm2 10~70mm2
Binding Screw M5 M6 M8
Auxiliary Loop Single Core or Stranded Wire 2*(0.75~1.5)mm2 2*(0.75~1.5)mm2 2*(0.75~1.5)mm2
Binding Screw M3 M3 M3

Dimension: (Unit: mm)

Tips: What is a Thermal Overload Protection Relay Used For?

The thermal element of the thermal overload relay is connected to the motor circuit directly or through a current transformer. When the motor is overloaded, the main bimetallic sheet is heated to the operating temperature, so that the relay operates, breaking the power circuit of the motor, and preventing the motor from being damaged by overload. The action time of the relay varies with the magnitude of the overload current according to the inverse time limit. Therefore, its thermal characteristics are easy to match with the thermal characteristics of the motor, and it has the characteristics of simple structure, low price, stable operation performance and convenient use. Therefore, most squirrel-cage rotor motors and partially wound rotor motors still use thermal overload relays as protection against overload, phase failure and current unbalanced operation. Thermal overload relays can also be used as control appliances for the heating state of other electrical equipment.

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