circuit breaker contact resistance tester

The circuit breaker contact resistance tester, also known as the loop resistance tester or the high current micro-ohmmeter, is a specialized device used for measuring the contact resistance of high and low voltage switches, cables, wires, and weld seams. It follows national standards GB763, GB50150 and DL/T596, and complies with DL/T967-2005, IEC 62271 and other power testing regulations.
This instrument adopts the four-wire testing principle, with a measurement range of 0 - 20000.0 μΩ (100A range), a resolution of 0.1 μΩ, and an accuracy of 0.5% ± 2 digits. It has an internal microprocessor for automatic testing, is equipped with a seven-inch touch screen, a thermal printer and a 1000 data storage function, and supports RS232/USB interface transmission. Some models are designed as handheld, with a working temperature range of -25°C to 50°C, IP65 protection level and military-grade electromagnetic shielding technology. Through intelligent temperature control and triple protection mechanisms, it ensures stable operation in humid and highly interfered environments, meeting the professional needs of power departments for on-site high-voltage switch maintenance and loop resistance testing in high-voltage switch factories.