China Thermal Relay Manufacturer, Supplier, Factory

The SONTUOEC thermal relay is a relay that protects electrical equipment by monitoring the heat generated when current passes through a conductor. When the current exceeds the rated value, the thermal relay will quickly act to disconnect the circuit and prevent damage to the equipment due to overload.

Main Features:

Overload protection: When the current in the circuit exceeds the rated value that the equipment can withstand, the thermal relay will quickly react and disconnect the circuit to prevent damage to the equipment due to overload.

Short circuit protection: When a short circuit occurs in the circuit, the thermal relay can quickly react, disconnect the circuit and prevent damage to the equipment by short circuit current.

Phase loss protection: In a three-phase circuit, if a phase loss occurs, the thermal relay will detect and disconnect the circuit of the missing phase to ensure the normal operation of the equipment.

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STR2-D13 Thermal Relay

STR2-D13 Thermal relay is the use of current through the heat generated by the thermal element, so that there are different coefficients of expansion of the bimetallic sheet deformation, when the deformation reaches a certain distance, to promote the action of the connecting rod, so as to make the control circuit is disconnected, to achieve the overload protection of the motor. As an overload protection element of motor, STR2-D13 Thermal relay has the advantages of small size, simple structure and low cost.

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STH-N Model Thermal Relay

STH-N Model Thermal Relay is especially designed for the overload protection of AC motor, when the motor running current exceeds the rated current, the thermal relay can automatically cut off the circuit to prevent the motor from being damaged due to overloading.

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STH-40 Series Thermal Overload Relay

STH-40 series thermal overload relay is suitable for the circuit of ac 50/60 Hz,rated operational voltage up to 660V. And it can realize the function of overload and phase-failure protection for AC motor. This product conforms to GB14048.4,IEC60947-4-1 Standard.

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STR2-D33 Thermal Overload Relay

STR2-D33 Thermal overload relays work on the principle of the thermal effect of electric current. When a motor is overloaded, its current increases, causing the heating element inside the thermal overload relay to heat up. This heat is transferred to the bimetal, which is made of two metals with different coefficients of thermal expansion, so it bends when heated. When the bending reaches a certain point, it triggers a mechanical device, usually a contact, which disconnects the power supply to the motor, thus protecting it from damage.

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