Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A)

Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series MNY50A series

NY50A Series (General Wiring Protection) This is a 50AF circuit breaker for wiring that protects medium-capacity trunk lines and branch circuits in distribution boards and control panels, as well as various power supply devices (2-pole: NY52A, 3-pole: NY53A). Unlike conventional thermal-magnetic types, it employs a fully electromagnetic design using an oil dashpot, ensuring that it exhibits the specified trip characteristics even in harsh temperature environments, such as sealed panels in summer or areas with concentrated heat-generating equipment. It eliminates concerns about false tripping in large current loads (such as heater panels, high-capacity switching power supplies, and distribution trunk lines) where a 30AF may be insufficient, thereby establishing a robust power infrastructure. MNY50A Series (Motor Protection) This is a 50AF motor breaker designed for large three-phase induction motors, such as blowers, high-pressure pumps, and large compressors (3-pole: MNY53A). It features a large inrush current delay characteristic that allows it to tolerate inrush currents several times the rated current during motor startup, thoroughly preventing malfunctions at startup. In the event of overload, binding, or short circuit accidents, it quickly disconnects the circuit. Because it is fully electromagnetic, it can be reset immediately after tripping without waiting for a cooling period, minimizing downtime for production lines and critical equipment in factories.