NY50A Series / MNY50A Series
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series MNY50A series
The NY50A series (NY52A / NY53A) and MNY50A series (MNY53A) are fully electromagnetic circuit breakers for wiring rated at 50AF.
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 typical thermal-magnetic types, it employs a fully electromagnetic design using an oil dashpot, allowing it to exhibit trip characteristics as designed even in harsh temperature environments, such as sealed panels during summer or areas with concentrated heat-generating equipment. It eliminates concerns about false tripping in large current loads (such as heater panels, large-capacity switching power supplies, and distribution trunk lines) where the 30AF may be insufficient, thereby establishing a robust power infrastructure. MNY50A Series (Motor Protection Compatible) This is a 50AF motor breaker designed for large-capacity 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 for 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. Being fully electromagnetic, it allows for immediate re-engagement without waiting for a cooling period after tripping, minimizing downtime for factory production lines and critical equipment.
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basic information
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A)
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Applications/Examples of results
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.
Detailed information
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A)
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Nihon Kiko Manufacturing's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A) Frame size (AF)・Number of poles (2 poles・3 poles)・Basic model name (NY52A NY53A MNY53A) Rated insulation voltage・Rated operational voltage・Standard rated current (A)・Instantaneous tripping type (IT)・Instantaneous tripping current value (A)・Rated breaking capacity (kA)・Surface type product weight (kg)・Remarks
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A) Operating time - temperature correction curve
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A) Operating characteristic curve
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NY50A series (NY52A NY53A) MNY50A series (MNY53A) Operating characteristic curve
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Complete Electromagnetic Circuit Breaker New-FM Wiring Circuit Breaker NY50A Series (NY52A NY53A) MNY50A Series (MNY53A) Outline Dimension Diagram
Line up（2）
| Model number | overview |
|---|---|
| NY50A Series (NY52A NY53A) | General wiring protection. Medium capacity stable protection: Ensures reliable protection for steady loads such as main and branch circuits, heaters, and power panels up to a maximum of 50A class. Temperature-independent and immediate reset: Due to its fully electromagnetic design, there are no false trips caused by heat even in high-temperature environments within sealed panels, allowing for immediate re-engagement without waiting for the bimetal to cool after tripping. |
| MNY50A Series (MNY53A) | [Motor Protection Combined] Large Inrush Current Delay Characteristics: Allows several times the rated inrush current, which flows when starting medium-capacity three-phase motors (such as pumps, large fans, compressors), to pass without false detection. High-speed disconnection only during abnormal conditions: While allowing inrush during startup, it quickly disconnects the circuit in the event of true abnormalities such as overload, binding, or short circuits. |
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Nikko Electric's new base, Satellite Akiba (Tokyo, Akihabara), opened in February 2024. We aim to create a facility that connects not only sales but also factory technology and the web, allowing us to propose the most optimal transformers in real-time! If you have any issues regarding transformers, coils, or reactors, please feel free to consult with Nikko Electric. We will propose the best transformers through discussions with our customers.
