NS50AU MNS50AU series
Nihon Kiko Manufacturing's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU MNS50AU series
50AF fully electromagnetic circuit breaker (MCCB) certified to UL standards (North American safety standards).
The NS50AU (NS52AU / NS53AU) and MNS50AU (MNS53AU) in the New-FM series are fully electromagnetic circuit breakers (MCCB) for wiring, certified to UL standards (North American safety standards), as indicated by the suffix "U." They are designed primarily for integration into control panels and distribution boards for export machinery and equipment aimed at the North American market (United States and Canada), as well as for the domestic market.
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basic information
- Presence or absence of the initial "M" NS: For general wiring protection (heaters, power supply, general loads) MNS: For motor protection (for three-phase induction motors with large inrush current delay characteristics) - Numerical part 52: 2 poles (2P) 53: 3 poles (3P) - Suffix "AU" A: 50AF standard frame specification U: Global certification specifications compliant with UL standards (such as UL489) / CSA standards Devices for domestic use ➔ Standard NS50A / MNS50A (if large interruption is needed, AH) Devices for North America (USA and Canada) / UL panels ➔ NS50AU / MNS50AU
Applications/Examples of results
NS50AU Series (NS52AU / NS53AU) [General Wiring Protection, UL Compliant] Main Applications: Power distribution within control panels for industrial machinery, machine tools, and semiconductor manufacturing equipment exported to North America, as well as heater circuits and primary side protection for switching power supplies. Features: - Compliance with North American safety standards: Certified with UL Listed and other certifications, directly suitable for panel designs that require North American standards (such as NFPA79). - Complete electromagnetic environmental resistance: The oil dashpot mechanism prevents the influence of internal panel temperature (heat accumulation in sealed panels), cutting overloads and short circuits at rated values as designed. MNS50AU Series (MNS53AU) [Motor Protection Compatible, UL Compliant] Main Applications: Immediate protection for three-phase motors (cooling pumps, exhaust fans, compressors, etc.) installed in machinery and plant equipment exported to North America. Features: - Motor-specific delay + UL certification: While allowing intense inrush current (starting current) during motor startup, it provides fast disconnection in case of binding or phase-to-phase short circuits. - Zero cooling wait: Unlike bimetallic types, it can be immediately re-engaged without waiting for cooling after disconnection, minimizing recovery time and downtime on-site overseas.
Detailed information
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Nihon Kiko Manufacturing's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU)
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Nihon Kiko Manufacturing's complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU) Frame size (AF) • Number of poles (2 poles, 3 poles) • Basic model name (NS52AU NS53AU MNS53AU) Rated insulation voltage • Rated operating voltage • Standard rated current (A) • Instantaneous trip type (IT) • Instantaneous trip current value (A) • Rated breaking capacity (kA) • Surface type product weight (kg) • Remarks
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Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU) Operating time - temperature correction curve
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Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU) Operating characteristic curve
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Complete electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU) by Nichi-Ko Electric Manufacturing Co., Ltd. Outline dimension diagram
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Nihon Kōsokudō's fully electromagnetic circuit breaker New-FM wiring circuit breaker NS50AU (NS52AU NS53AU) MNS50AU (MNS53AU) External dimension diagram
Line up（2）
| Model number | overview |
|---|---|
| NS50AU(NS52AU NS53AU) | UL-compliant type. Export equipment for North America and global specification panel. Space and creepage distances, terminal structure compliant with UL standards. |
| MNS50AU(MNS53AU) | UL-compliant type. Export equipment for North America and global specification panel. Space and creepage distances, terminal structure compliant with UL standards. |
catalog（1）
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Company information
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.
