Hydraulic Magnetic Circuit Breaker

Hydraulic magnetic circuit breakers and thermal circuit breakers are both used for protecting electrical circuits, but they operate differently.

Hydraulic magnetic circuit breakers use a combination of magnetic and hydraulic forces to detect overcurrents. When an overcurrent occurs, the electromagnetic coil generates a magnetic field, moving a plunger against hydraulic resistance. If the current exceeds the rated threshold for a sufficient duration, the plunger trips the breaker. These breakers are highly precise and unaffected by ambient temperature, making them ideal for environments with temperature fluctuations or critical systems where consistent protection is needed.

Thermal circuit breakers, on the other hand, rely on heat generated by excessive current to trip the breaker. They contain a bimetallic strip that bends when heated by an overcurrent, eventually triggering the trip mechanism. Since this process is dependent on heat, thermal breakers are influenced by surrounding temperature, which may cause premature or delayed trips in extreme conditions.

In summary, hydraulic magnetic breakers provide more accurate and reliable protection, particularly in varying temperature environments, while thermal breakers are simpler and more cost-effective but less precise in extreme conditions. Both are useful in different applications, with hydraulic magnetic breakers being preferred for mission-critical systems.