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25A 1 Pole B Curve 6kA MCB (NB1-63B1P25)

Chint NB1-63B1P25 25A 1 Pole B Curve 6kA MCB provides reliable circuit protection against overloads and short circuits, ideal for residential and light commercial use.

Reliable Protection: Safeguards circuits from overloads and short circuits. High Breaking Capacity: 6kA rating ensures safe handling of high fault currents. Versatile Tripping Curve: B Curve ideal for lighting and general-purpose circuits. Compact & Easy Installation: DIN rail mounted for consumer units and panel boards. Durable Quality: Part of Chint’s trusted NB1-63 Series for consistent, long-lasting performance.
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SKU: NB1-63B1P25
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Product Details

Ensure the safety and reliability of your electrical circuits with the Chint NB1-63B1P25 25A 1 Pole B Curve 6kA MCB. Designed to provide precise protection for residential and light commercial installations, this miniature circuit breaker safeguards your wiring against overloads and short circuits, preventing costly damage and downtime.

Part of the trusted NB1-63 Series, this 1 Pole MCB is rated at 25 amps with a B Curve tripping characteristic, making it perfect for circuits with moderate inrush currents, such as lighting and general-purpose sockets. The 6kA breaking capacity ensures it can handle high fault currents safely, providing peace of mind for homeowners, electricians, and building managers alike.

Its compact design allows for easy DIN rail installation, optimising space in consumer units and panel boards. Crafted from high-quality, durable materials, the NB1-63B1P25 offers long-term performance and consistent operation, even under demanding conditions. The MCB’s intuitive design ensures quick installation and reliable protection without unnecessary complexity.

Whether you are upgrading your electrical distribution, replacing a faulty MCB, or building a new installation, the NB1-63B1P25 delivers consistent protection that meets modern safety standards. Its robust build, coupled with Chint’s reputation for quality, makes it a reliable choice for both professionals and DIY enthusiasts seeking durable circuit protection.

Stay secure and reduce the risk of electrical faults with a miniature circuit breaker designed to perform when it matters most. With the Chint NB1-63B1P25, your circuits are in safe hands.

Product Specifications

Electrical Specifications

  • Model: NB1-63B1P25
  • Rated Current (In): 25A
  • 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: 3.5W
  • 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

  • Reliable Protection: Engineered to protect circuits against short-circuit and overload currents, specifically for TN and IT earthing systems.
  • Integrated Safety: Features a trip-free mechanism, ensuring the circuit breaker operation 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 for reduced installation costs.

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
25A 1 Pole B Curve 6kA MCB (NB1-63B1P25) - Data Sheet
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