Electromagnetic Relay Motor Protection Thermal Overload Relay UL Approvals
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Electromagnetic Relay Motor Protection Thermal Overload Relay UL Approvals
UKH series thermal overload relays apply to industrial 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.
Specifications:
Characteristics:
1. Be mounted with contactor UKC1-22 directly
Construction of Thermal Relay:
The construction of thermal relay is quite simple. As shown in the figure above the bimetallic strip has two metals – metal A and metal B. Metal A has lower coefficient of expansion and metal – B has higher coefficient of expansion. One heating coil is would on the bimetallic strip. When over current flows through the heating coil, it heats up the bimetallic strip.
Due to the heat generated by the coil, both of the metals are expanded. But expansion of metal B is more than expansion of metal A. Due to this dissimilar expansion the bimetallic strip will bend towards metal A as shown in the figure below.
Applications:
A thermal overload relay is an electrical protection device designed to disconnect a machine, appliance, or installation from its power supply should damage or overload occur. This protection is achieved by the inclusion of various types of heat sensitive elements to cut the power supply under overload conditions. These thermal elements react to the current the protected component draws during its operation. Should the component experience excessive increases in load, physical wear, or damage, the amount of current drawn will increase correspondingly. This will cause a thermal cut-out and disconnect the main feed to the protected component.
Main benefits:
1. Reliable protection for motors 2. Easy to create starters 3. Optimized match to UKC1 series contactors 4. Single mounting kits and wire reset for remote control available for specific applications.
Working conditions:
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
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