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.
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).
Price range
Delivery Time
Model number/Brand name
Nichiyu Electric Manufacturing Co., Ltd. Fully Electromagnetic Circuit Breaker New-FM Wiring Circuit Breaker NS50A NS50AH MNS50A MNS50AH Series
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
-
Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50A (NS52A NS53A) NS50AH (NS52AH NS53AH) MNS50A (MNS53A) MNS50AH (MNS53AH)
-
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. |
catalog（1）
Download All Catalogs
Recommended products
Distributors
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.