The core job of a molded case circuit breaker (MCCB) is to cut the circuit the instant an overload or short circuit occurs, protecting downstream equipment. The Fuji BW series uses a thermal-magnetic dual protection mechanism: the thermal element detects sustained overload, and the magnetic element handles the instantaneous high current of a short circuit, each doing its own job. The range covers 75 A protection for small equipment up to 630 A for heavy-duty distribution panels, with AC / DC capability for more flexible configuration, and is widely used in factory distribution panels, machinery and building power systems.
Specifications
| Item | BW630RAG | BW125RAG-3P075 | BW125JAG 2P |
|---|---|---|---|
| Frame current (AF) | 630 A | 125 A | 125 A |
| Poles | 3P / 4P | 3P | 2P |
| Rated current (AT) | 500 / 600 / 630 A | 75 A | 15–125 A |
| Rated voltage | AC690 V / DC250 V | AC690 V | AC440 V |
| Breaking capacity at AC440 V | 50 / 25 kA (IEC) | 50 kA | 30 kA |
| Breaking capacity at AC240 V | 100 / 50 kA | 100 / 50 kA | — |
| Protection | Thermal-magnetic dual protection (overload + short circuit) | Thermal-magnetic dual protection (overload + short circuit) | Thermal-magnetic dual protection (overload + short circuit) |
Accessory: BW9BTAA-S2W terminal cover (fits the BW125 series).
Key features
- Thermal-magnetic dual protection: responds precisely to both sustained overload and instantaneous short circuit.
- AC / DC capable (BW630RAG): AC690 V / DC250 V for more flexible configuration.
- High breaking capacity: the BW630RAG reaches 100 kA at AC240 V for high short-circuit current environments.
- Wide current coverage: the BW125JAG 2P covers 15–125 A, so one model fits many equipment ratings.
How to request a quote: please send (1) the model, poles and rated current; (2) the quantity; (3) how urgent it is.
Trademarks: Fuji Electric and the model names on this page are trademarks or model names of their owner, used here only to identify the products. JIAHON is not the authorized distributor of Fuji Electric in Taiwan.
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