Circuit Protection

GCB1-63 MCB 2P 63A DIN Rail 6kA

Walax GCB1-63 series 2-pole MCB rated up to 63A. Heavy-duty single-phase protection for high-current residential feeders and small-commercial sub-mains — the right choice for distribution boards feeding EV chargers, air-conditioning, and water-heater circuits.

63A High-Current Frame

Same compact 36mm module width as smaller MCBs but rated to 63A — ideal for high-current feeders (EV chargers, AC units, water heaters).

35mm² Terminal Capacity

Accepts cables up to 35mm² — the right specification for the main incoming cable on residential and small-commercial sub-boards.

B/C/D Curves Available

Full range of tripping characteristics from one frame — stock B, C and D curves to cover all sub-circuit applications.

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	2P (single-phase L+N)
Rated voltage	AC 230V / 400V
Breaking capacity	6kA
Tripping curve	B / C / D
Electrical life	≥ 4,000 operations
Mechanical life	≥ 20,000 operations
Mounting	35mm DIN rail
Terminal capacity	Up to 35 mm²
Calibration temperature	30°C
Ambient temperature	-5°C to +40°C

Applications

Where This Breaker Ships

Main incoming protection for sub-distribution boards, EV charger circuits, air-conditioner feeders, water-heater circuits, and high-current socket outlets. The 2P configuration isolates both line and neutral simultaneously for safe maintenance.

FAQ

Frequently Asked Questions

Can this MCB be used as the main switch on a sub-board?

Yes — 2P 63A GCB1-63 is commonly used as the main isolator for residential and small-commercial sub-distribution boards, provided the upstream short-circuit level does not exceed 6kA.

What's the maximum cable size accepted?

Up to 35mm² copper cable fits the tunnel terminals — suitable for the main incoming feeder cable on most residential installations.

Do you offer higher kA versions?

Yes — 10kA versions are available for installations with higher prospective short-circuit current. Contact us with your specification.

What about DC applications?

This GCB1-63 is an AC MCB. For DC circuits see our DC MCB 1000V 4P product.

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