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.
Specification:
| 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)
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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