EM30B Series EM50B Series
No characteristic variation due to changes in ambient temperature! A completely electromagnetic leakage circuit breaker that reliably protects against overcurrent, short circuits, and ground faults (leakage) with just one unit.
The "New-FM Series (EM30B / EM50B)" from Nichiyu Electric Manufacturing Co., Ltd. is a fully electromagnetic leakage circuit breaker (ELCB) that employs an oil dashpot method instead of using bimetal (thermal) for overcurrent detection and disconnection mechanisms. In addition to overload and short-circuit protection, it prevents electric shock accidents and leakage fires through high-speed disconnection during ground faults (leakage). 【Ideal for the following challenges and applications】 - To prevent malfunctions (unnecessary trips) of thermal leakage breakers due to significant temperature rises within control panels and distribution boards. - For electric shock protection and leakage fire prevention in branch circuits of factory equipment, machine tools, distribution boards, and outdoor panels. - To protect both overcurrent and leakage with a single unit in a space-saving and highly accurate manner.
basic information
- Series name: New-FM Series - Frame size: 30AF (EM30B), 50AF (EM50B) - Operating method: Fully electromagnetic (oil braking method) + electronic leakage detection - Model (30AF): EM32B (2-pole), EM33B (3-pole) - Model (50AF): EM52B (2-pole), EM53B (3-pole) - Rated current (In): 3A / 5A / 10A / 15A / 20A / 30A (EM30B), 30A / 40A / 50A (EM50B) (varies by model) - Rated sensitivity current: 15mA / 30mA / 100mA / 200mA, etc. (varies by specification) - Rated operating voltage (Ue): AC100V / AC200V / AC100-200V dual-use, etc. - Connection method: Surface type (for crimp terminals and bar terminals), rear type, embedded type, etc. - Compliance standard: JIS C 8201-2-2, etc.
Price range
Delivery Time
Model number/Brand name
Nichiyu Electric Manufacturing Co., Ltd. New-FM Leakage Circuit Breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
Applications/Examples of results
**Main Features** Stable overcurrent protection characteristics unaffected by ambient temperature Due to its fully electromagnetic design, there is almost no variation in operating characteristics (derating) caused by changes in ambient temperature. It maintains the designed tripping characteristics even in sealed enclosures that tend to become hot or in harsh environments. Immediate reset after tripping is possible Unlike thermal types, there is no need to wait for the bimetal to cool down, allowing for quick re-engagement and recovery after removing the cause of overload tripping. 30AF and 50AF lineup available to suit applications (2-pole and 3-pole) - EM30B (EM32B / EM33B): Standard type with a 30A frame (2-pole and 3-pole) - EM50B (EM52B / EM53B): Standard type with a 50A frame (2-pole and 3-pole) High safety and extensive options Equipped with a test button for leakage operation testing and a leakage indication function, making maintenance and inspection easy. Additionally, it supports various auxiliary devices such as auxiliary switches (AX), alarm switches (AL), and voltage isolation devices (SHT), allowing for flexible integration into remote monitoring and control systems. *For detailed operating characteristic curves, rated sensitivity currents, dimensional drawings, and other technical materials, please download the catalog PDF for more information.*
Detailed information
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kōsokudō's complete electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
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Nihon Kiko Manufacturing's fully electromagnetic circuit breaker New-FM leakage circuit breaker EM30B (EM32B EM33B) EM50B (EM52B EM53B)
Line up（2）
| Model number | overview |
|---|---|
| Nichiyu Electric Manufacturing Co., Ltd. New-FM Leakage Circuit Breaker EM30B Series (EM32B EM33B) | Notice of discontinuation of production for leakage circuit breakers EM33B and EM53B with a rated sensitivity current of 15mA (November 22, 2024) *The 30mA model will continue to be produced. |
| Nichiyu Electric Manufacturing Co., Ltd. New-FM Leakage Circuit Breaker EM50B Series (EM52B EM53B) | Notice of discontinuation of production for leakage circuit breakers EM33B and EM53B with a rated sensitivity current of 15mA (November 22, 2024) *The 30mA model will continue to be produced. |
catalog（2）
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