HAIPART Thermal Trip Units: Professional Circuit Protection for Electrical Safety
As a leading Chinese manufacturer of thermal trip units, HAIPART utilizes a nickel-chromium/copper composite bimetallic strip to achieve precise temperature control within ±3%. An integrated thermal compensation spring ensures stable operation across a wide temperature range of -25°C to 70°C, while a thermal calibration lever mechanism significantly improves operational consistency. Laboratory verification shows that this device responds rapidly within 60 seconds under 1.5 times overload, with a repeatability accuracy of ±5%, a mechanical life exceeding 20,000 cycles, and IP40 protection rating certification. The products are widely used in industrial control panels, smart grid infrastructure, HVAC power management systems, and renewable energy devices, providing robust safety guarantees for industry and smart grids through technological innovation, reliable quality, and comprehensive application scenarios.
Q1:What is the core function of the thermal trip unit?
A1:It provides overload protection by using the principle of bimetallic strip bending under heat to delay and cut off the circuit when the current continuously exceeds the rated value, preventing the equipment from being damaged by long-term overload.
Q2:What are the differences between a thermal trip unit and a magnetic trip unit?
A2:Thermal trip: Only responds to overload current (delayed action), no short-circuit protection.
Magnetic trip: Only responds to short-circuit current (instantaneous action), no overload protection.
Q3:What are the requirements for the installation location of the thermal trip unit?
A3:By placing it close to the load side, the impact of line impedance on protection sensitivity is reduced.
Q4:How to verify the reliability of the thermal trip unit's operation?
A4:The short-circuit test simulates fault current to verify that the trip unit operates within 5ms, while the overload test continuously operates at 1.2 times the rated current to ensure that the thermal trip does not malfunction.
Q5:What are the common causes of malfunctions in magnetic trip units?
A5:Electrical interference and mechanical jamming.
Q6:What are the safety standards for magnetic trip units?
A6:Electrical safety must pass the IEC 60947-2 short-circuit withstand test (e.g., 50kA/1s), and outdoor applications must meet the IP54 protection rating (dustproof and waterproof).
Q7:Special design of magnetic trip unit in low-voltage power distribution?
A7:Selective protection and shunt trip extension.
Q8:What are the prices of your products?
A8:Product prices vary depending on the model, specifications, and quantity. Please consult the sales team or check the official website for details.
Q9:What after-sales services do you provide?
A9:We provide comprehensive after-sales services, including product consultation, technical guidance, installation and commissioning, repair and replacement, and warranty.
Q10:How can I contact your technical support?
A10:Technical support can be contacted through the official website, customer service hotline, or email.
We believe that through our manufacturing strengths and service commitment, we are able to provide our customers with superior products and an unparalleled service experience.
