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63A 1 Pole B Curve 6KA MCB (NB1‑63B1P63)

Reliable 63A single-pole B curve MCB with 6 kA breaking capacity from CHINT’s NB1 range. Ideal for protecting lighting and general circuits, simple DIN rail installation for homes and commercial spaces.

Reliable Circuit Protection – Protects against overloads and short circuits to enhance safety of wiring and equipment. Industry-Standard Breaking Capacity – 6 kA rating ensures effective fault current interruption in typical installations. B Curve Trip Characteristic – Ideal for lighting and general circuits where fast response is needed. Compact and DIN Rail Ready – Fits standard electrical enclosures and simplifies installation. Durable Build – Flame-retardant housing and IP20 protection for long service life.
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SKU: NB1-63B1P63
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Product Details

The 63A 1 Pole B Curve 6KA MCB (SKU: NB1‑63B1P63) is a high-quality miniature circuit breaker from CHINT’s NB1‑63 range, designed to protect electrical circuits from overload and short-circuit faults. With a robust 63 ampere rating and a B curve trip characteristic, this single-pole breaker offers reliable protection for domestic and light commercial electrical installations. Its compact design fits standard DIN rail systems, making it easy to install in consumer units and distribution boards.

Built to meet industry standards, this MCB provides a 6 kA breaking capacity, ensuring it can safely interrupt fault currents up to 6000 amps without damage. The B curve tripping response is ideal for general resistive loads such as lighting circuits and everyday sockets, offering dependable performance where rapid response to overcurrents is required. It is designed for operation on 230 V AC single-phase systems, suited to UK mains and similar supply networks.

Constructed with durable, flame-retardant materials and protected to IP20, the NB1‑63B1P63 withstands everyday electrical demands while maintaining safety and longevity. The thermal-magnetic mechanism ensures that in the event of an overload or short circuit, power is cut quickly and effectively to prevent damage to wiring and connected devices. This MCB is suitable for use in homes, offices, workshops and other environments where reliable circuit protection is a priority.

Whether you are building a new consumer unit or replacing an old breaker, the CHINT NB1‑63B1P63 offers dependable protection you can trust. Its proven performance, compact footprint and easy installation make it a smart choice for electricians and DIY installers alike.

Product Specifications

Electrical Specifications

  • Model: NB1-63B1P63
  • Rated Current (In): 63A
  • Number of Poles: 1P
  • Tripping Curve: B Curve (3-5 In)
  • Rated Voltage (Ue): 230/400V AC
  • Rated Frequency: 50/60Hz
  • Rated Short-circuit Capacity (Icn): 6,000A (6kA)
  • Rated Insulation Voltage (Ui): 500V
  • Rated Impulse Withstand Voltage (Uimp): 4,000V (4kV)
  • Energy Limiting Class: 3
  • Power Loss per Pole: 5W
  • Release Type: Thermo-magnetic

Mechanical & Installation Data

  • Mounting: 35mm DIN Rail (EN 60715) via fast clip device
  • Terminal Connection Type: Cable / U-type busbar / Pin-type busbar
  • Terminal Size (Cable): Up to 25mm² (18-4 AWG)
  • Terminal Size (Busbar): Up to 10mm² (18-8 AWG)
  • Tightening Torque: 2.5 N·m (22 In-lbs)
  • Connection Direction: From top and bottom
  • Electrical Life: 4,000 operations
  • Mechanical Life: 20,000 operations
  • Protection Degree: IP20
  • Contact Position Indicator: Yes (Color-coded visual indication)

Environmental Specifications

  • Ambient Operating Temperature: -5°C to +40°C (Daily average ≤ 35°C)
  • Storage Temperature: -25°C to +70°C
  • Reference Temperature for Tripping: 30°C
  • Pollution Degree: 2

Dimensions

  • Width: 18mm (1 module)
  • Height: 86mm
  • Overall Depth: 78mm

Key Features

  • Versatile Protection: Ideal for protecting resistive and inductive loads where high inrush currents are not expected.
  • Integrated Safety: Features a trip-free mechanism, ensuring the circuit breaker cannot be defeated by holding the handle in the "ON" position.
  • Efficient Cooling: Includes a built-in heat dissipation gap to provide better cooling during sustained operation.
  • Visual Status Monitoring: Equipped with a color-coded contact position indicator that provides clear visual confirmation of the device status and insulation function.
  • Flexible Installation: Features an extendable DIN-rail holder for easy installation and terminals that accept both wire and various busbar types.

Standards & Compliance

  • Primary Standard: IEC/EN 60898-1
  • Certification: CE Marked, ASTA Licensed, VDE, KEMA, SEMKO, RCC, UL Verified

Shipping & Collection

Tracked Delivery (Currently 1-3 business days):

  • Free over £250.
  • £5.99 for orders under £250.
  • £5.99 for orders under £50.

Next Business Day Delivery:

  • £15 Flat Rate.

Collection:

  • Free to collect from our warehouse.

Pre-Order:

  • 5-10 Business Days delivery unless otherwise stated.

Shipping Policy

Datasheets
63A 1 Pole B Curve 6KA MCB (NB1‑63B1P63) - Data Sheet
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