Fuji BZ6N10D 1-Pole Molded Case Circuit Breaker (MCCB) — 6 A

Fuji Electric · BZ Series · 1-Pole MCCB · 6 A · 240 V / 440 V

The Fuji BZ6N10D is a 1-pole molded case circuit breaker from Fuji Electric’s compact BZ series, rated for 6 A continuous current in 240 V or 440 V class panels. Packed as 1PC in the original Fuji box, the BZ6N10D delivers fixed thermal-magnetic protection for branch circuits inside factory control panels, distribution boards, and small fractional-horsepower motor loads. KOEED stocks the BZ series for new builds and legacy maintenance, and supports the full Fuji MCCB line across the standard current range.

Key Technical Specifications

The BZ6N10D is the 6 A entry of the compact BZ family, the “N” suffix designating the 240 V / 440 V class, and “10D” identifying the 10 kA breaking-capacity grade with standard lug terminal. Decode the model number in one line: B = B-series MCCB frame, Z = fixed thermal-magnetic trip, 6 = 6 A rated current, N = 240 V / 440 V class, 10D = 10 kA interrupting capacity with standard terminal. The full spec ledger is below.

Application Scenarios — Where It Fits

A 6 A BZ-frame breaker typically sits in the branch-circuit layer of any industrial control cabinet. Common positions for the Fuji BZ6N10D include:

• Branch circuit protection inside control panels feeding PLCs, HMIs, sensors, and 24 VDC power supplies
• Small motor protection for fractional-horsepower three-phase motors, fans, and pumps
• Lighting and receptacle circuits on factory floors and machine rooms
• Auxiliary circuits on CNC machines, packaging lines, and material-handling systems
• Distribution sub-feeders downstream of a main breaker in factory automation switchgear

In practice, the BZ6N10D is the type of breaker you find beside an Allen-Bradley ControlLogix rack, a Siemens SIMATIC S7-300 panel, a Mitsubishi MELSEC enclosure, an Omron SYSMAC rack, a Fanuc CNC operator station, a Schneider Modicon cell, a Yaskawa MP cabinet, a Panasonic FP panel, or a KEYENCE vision cell — wherever a 6 A branch needs clean, code-compliant overcurrent protection.

Integration & Wiring Notes

Wire the BZ6N10D as a 1-pole device on the line side of the load it protects. Use conductors sized to the upstream breaker and tightened to the torque marked on the breaker body — typically M5 lugs accept 2.5 to 14 AWG copper. The line and load terminals are not polarized for DC operation, but AC installations should follow the printed LINE / LOAD marking to maintain the interrupting-capacity certification.

The compact BZ frame allows side-by-side mounting on a DIN-rail adapter or direct panel mount with M4 screws. When installing in a multi-breaker assembly, leave the manufacturer-recommended spacing between units so the magnetic trip elements do not cross-heat under sustained load. Verify that the breaker’s 10 kA (or 2.5 kA on the 440 V class) interrupting rating is equal to or greater than the available fault current at the panel bus — otherwise upstream current-limiting fuses or a higher-rated main breaker must be added.

When retrofitting the BZ6N10D into a legacy Fuji BW or older J-frame panel, confirm the DIN-rail adapter footprint matches. For cabinets that also hold breakers from other vendors, mount the BZ6N10D on a separate bracket to keep it isolated from higher-rupture-capacity units.

Installation & Commissioning Tips

Before energizing, mechanically toggle the BZ6N10D handle ON and OFF several times to confirm smooth action and that the TRIP position resets cleanly. Verify the line and load conductors are landed on the correct side with no insulation caught under the lug, and re-torque terminations after 24 hours of thermal cycling on first commissioning — copper cold-flow is a common cause of field failures that show up only as nuisance trips weeks later.

Schedule periodic thermography on the line side at six-month intervals — hot spots indicate loose lugs long before the breaker trips. The thermal trip curve is calibrated for 40 °C ambient; cabinets near heat sources may need a derating factor of 0.8 to 0.9 applied to the rated current. Keep the BZ series away from vibration sources common to stamping presses and large motor starters, since mechanical shock can desensitize the magnetic trip over time.

For spare-parts planning, KOEED recommends stocking at least two BZ6N10D units per ten identical cabinets, since a single tripped breaker on a legacy line can stop an entire cell. Engineers experiencing unexplained trips can use the free PLC error-code lookup or the AI diagnostic tool to cross-check against the wider control panel before replacing the breaker.

Procurement, Warranty & Lead Time

KOEED sources the Fuji BZ6N10D as new, original Fuji Electric product supplied in the original manufacturer’s box. Each unit ships with a 12-month warranty covering manufacturing defects under normal operating conditions. Worldwide shipping is available to North America, Europe, the Middle East, Southeast Asia, and South America through standard express couriers.

Stock status and lead time change daily. For current availability, current pricing, and project-specific delivery dates, send your RFQ to Moritta@KOEED.COM with quantity, destination country, and any project deadline. KOEED responds with a confirmed quote within 24 hours on business days. Recent shipment records are visible on the real-time sales list for full transparency on lead time and destination.

If the BZ6N10D is part of a larger BOM that also includes Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, or KEYENCE parts, send the full instrument list to Moritta@KOEED.COM in one email. KOEED quotes and ships the entire bill together, eliminating multi-supplier coordination. For obsolete breakers, use the AI diagnostic tool to upload a nameplate photo for a manual cross-reference.

Have a question before you send the BOM? Reach the KOEED sourcing team at Moritta@KOEED.COM or open the contact form for multi-channel support. Related brand collections: Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, and KEYENCE.