Circuit Protection

NXB-63 MCB 1P C63 230-400V DIN Rail 6kA

Walax NXB-63 single-pole C-curve MCB rated to 63A. Standard specification for residential distribution boards — covers every lighting and socket sub-circuit at 230V/400V 50/60Hz. C-curve calibration tolerates the inrush of small motors and fluorescent loads.

63A Maximum Rating

Full 6-63A range on a single-pole 18mm module — covers every residential lighting and socket sub-circuit on the same frame.

C-Curve Calibration

C-curve tripping (5-10× In) handles the inrush current of motors, fluorescent lamps and small transformers without nuisance tripping.

Tropicalised Build

Anti-humidity treatment as standard for export to high-humidity markets in West Africa, Southeast Asia and South America.

Specifications

Technical Specifications

Standard ratings listed below – custom configurations available on request. Contact our engineers to confirm parameters for your market.

Standard	IEC 60898-1 · CE
Rated current	6A – 63A
Poles	1P
Rated voltage	AC 230V / 400V (50/60Hz)
Breaking capacity	6kA
Tripping curve	C (5×In – 10×In instantaneous)
Electrical life	≥ 4,000 operations
Mechanical life	≥ 20,000 operations
Mounting	35mm DIN rail
Terminal capacity	Up to 25 mm²
Module width	18mm (single pole)
Ambient temperature	-5°C to +40°C

Applications

Where This Breaker Ships

Residential distribution boards — single-pole protection for lighting circuits, socket outlets, water heaters, air-conditioner circuits and general-purpose sub-circuits. The C-curve calibration makes it the most popular specification for general-purpose residential use.

FAQ

Frequently Asked Questions

Is NXB-63 compatible with NXB-60?

Yes — same DIN-rail geometry and module width as NXB-60, allowing mixed installations in the same distribution board. The 63 vs 60 designation refers to the current rating ceiling, not the frame size.

What is C63?

C63 means 63A rated current with C-curve tripping characteristic. It is the highest single-pole rating in the NXB-63 range — typically used as a sub-main isolator or for high-current appliance circuits.

Do you offer B-curve or D-curve versions?

Yes — same frame, different calibration. B-curve (resistive loads), C-curve (mixed loads, motors), D-curve (large motors, transformers).

Do you provide test reports?

Yes – IEC 60898-1 type-test reports and CE documentation come with every shipment. Country-specific certifications (SONCAP, PVOC, SABER) available on request.

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