GTH40 UL Magnetic Thermal Overload Relay Electrical Protective Relays

UKH series thermal overload relays apply to circuit of AC 50Hz or  60Hz, rated voltage to below 660V and rated current . 1A-800A for AC motor overload and open-phase protection during long time or intermittent long time service, which can also protect 3-phase serious imbalance and long starting time of motor or long timer operation, can also be used for corresponding AC contactor for electromagnetic starter.

This product has innovative, elegant model and small installation area, functions such as temperature compensation, action indication, automatic and manual reset / stop with steady and reliable performance.

Thermal relay can be combined / connected with contactor or installed separately.

Standard: IEC 60947-1 

Applications:

Thermal overload relays are protective devices. They are designed to cut power if the motor draws too much 

 current for an extended period of time. To accomplish this, thermal overload relays contain a normally closed 

 (NC) relay. When excessive current flows through the motor circuit, the relay opens due to increased motor

 temperature, relay temperature, or sensed overload current, depending on the relay type. 

These overload relays are similar to circuit breakers in construction and use, but most circuit breakers differ

 in that they interrupt the circuit if overload occurs even for an instant.  Thermal overload relays are conversely

 designed to measure a motor's heating profile; therefore, overload must occur for an extended period before

 the circuit is interrupted.

Specifications:

Motion Characteristic:

Three-phase Balance Motion Time

Phase-losing Motion Characteristic

Working condition:

1. The installation altitude less than 2000m

2. The surrounding temperature range: from -5°C ~ +40°C

3. In the non-explosive condition. or without adequate erosion and destruction of gas and

    dust conductive area .

4. Without  rain and snow invade 

5. Pollution level 2