NS50A NS50AH MNS50A MNS50AH series
Nichiyu Electric Manufacturing Co., Ltd. Fully Electromagnetic Circuit Breaker New-FM Wiring Circuit Breaker NS50A NS50AH MNS50A MNS50AH Series
50AF (Ampere Frame) circuit breaker for wiring in the New-FM series of fully electromagnetic breakers by Nichiyu Electric Manufacturing Co., Ltd.
NS50A Series (NS52A / NS53A) [General Wiring Protection - Standard Breaker Type] A versatile 50AF model with standard breaking capacity. Due to its fully electromagnetic design, it does not experience false tripping due to ambient temperature even in high-temperature environments such as sealed control panels in summer, and it can be reset immediately after tripping. NS50AH Series (NS52AH / NS53AH) [General Wiring Protection - High Breaking Type] An advanced model with significantly enhanced rated breaking capacity (kA value) compared to the standard type (NS50A). It prevents damage to the breaker itself even in the event of a short circuit accident and safely interrupts large currents reliably. MNS50A Series (MNS53A) [Motor Protection Compatible - Standard Breaker Type] Equipped with a "motor-specific delay characteristic" that allows inrush currents of 5 to 8 times the rated current generated during motor startup to pass without tripping. It trips quickly during constraints, steady overloads, or short circuits. MNS50AH Series (MNS53AH) [Motor Protection Compatible - High Breaking Type] A heavy-duty model that combines "large inrush current delay specifically for motor protection" with "high rated breaking capacity (H specification)." It provides reliable motor protection even in harsh power supply environments.
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basic information
NS50A Series (NS52A / NS53A) [General Wiring Protection - Standard Breaking Type] NS50AH Series (NS52AH / NS53AH) [General Wiring Protection - High Breaking Type] MNS50A Series (MNS53A) [Motor Protection Combined - Standard Breaking Type] MNS50AH Series (MNS53AH) [Motor Protection Combined - High Breaking Type] - Determine whether to use "NS (General)" or "MNS (Motor)" based on the type of load. - Depending on the proximity to the power supply point and the calculated short-circuit current of the system, select either the standard "No Mark (A)" or the high breaking "H Marked (AH)". - Presence or absence of the initial "M": No Mark (NS) = for general wiring protection, M Marked (MNS) = for motor protection combined (with large inrush current delay characteristics). - Presence or absence of the final "H": No Mark = standard breaking capacity type, H Marked = high breaking capacity type (High Breaking Capacity). - Numerical part: "52" = 2 poles (2P), "53" = 3 poles (3P).
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Applications/Examples of results
NS50A Series (NS52A / NS53A) [General Wiring Protection - Standard Breaking Type] Application: Protection of medium-capacity circuits (up to 50A) centered around steady loads such as heaters, power supplies, and branch/trunk lines in control panels. NS50AH Series (NS52AH / NS53AH) [General Wiring Protection - High Breaking Type] Application: Trunk and branch circuits located near transformers or large capacity receiving panels, where there is a possibility of extremely high fault currents (short-circuit currents) during short-circuit incidents. MNS50A Series (MNS53A) [Motor Protection Compatible - Standard Breaking Type] Application: Protection of medium-capacity three-phase induction motor circuits such as fans, pumps, conveyors, and blowers. MNS50AH Series (MNS53AH) [Motor Protection Compatible - High Breaking Type] Application: Large and medium motor circuits installed in systems requiring high breaking performance, located near low power supply impedance (such as near large capacity receiving panels).
Detailed information
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Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
Line up（4）
| Model number | overview |
|---|---|
| NS50A(NS52A NS53A) | 【General Wiring Protection / Standard Circuit Breaker Type】 Purpose: Protection of medium-capacity circuits (up to 50A) centered around steady loads, such as heaters, power supplies, and branch/main lines in control panels. Features: A versatile 50AF model equipped with standard breaking capacity. Due to its fully electromagnetic design, it does not experience false tripping due to ambient temperature even in high-temperature environments like sealed control panels in summer, and it can be immediately reset after tripping. |
| NS50AH(NS52AH NS53AH) | 【General Wiring Protection / High Interrupting Type】 Purpose: Main and branch circuits that may experience extremely high fault currents (short-circuit currents) during short-circuit accidents, such as directly under transformers or near large-capacity receiving panels. Features: An advanced model with significantly enhanced rated interrupting capacity (kA value) compared to the standard type (NS50A). It prevents damage to the breaker itself even in the event of a short-circuit accident and reliably ensures safe interruption of large currents. |
| MNS50A(MNS53A) | 【Motor Protection and Standard Circuit Breaker】 Purpose: Protection of medium-capacity three-phase induction motor circuits such as fans, pumps, conveyors, and blowers. Features: Equipped with a "motor-specific delay characteristic" that allows inrush currents of 5 to 8 times the rated current generated during motor startup to pass without tripping. It trips quickly in cases of binding, steady overload, or short circuits. |
| MNS50AH(MNS53AH) | 【Motor Protection and High Interrupting Type】 Application: Large and medium motor circuits installed in systems where low power supply impedance (such as near large power capacity receiving panels) requires high interrupting performance. Features: A heavy-duty model that combines "motor protection dedicated large inrush current delay" and "high rated interrupting capacity (H specification)." It provides reliable motor protection even in harsh power supply environments. |
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