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16A 2 Pole B Curve 6KA MCB (NB1‑63B2P16)

A dependable 16 A, 2-pole miniature circuit breaker with B-type trip curve and 6 kA breaking capacity. Designed for reliable overload and short-circuit protection in residential and commercial electrical systems. Quick-mount on DIN rail and ideal for lighting and general circuits.

Trusted Circuit Protection – Protects circuits from overload and short-circuit faults up to 16 A with a robust 6 kA breaking capacity. B-Type Trip Curve – Trips at 3-5 times rated current, perfect for lighting and general resistive loads in homes and offices. Easy Installation – Modular 2-pole design clips onto standard 35 mm DIN rail for fast panel integration. Durable and Reliable – Built to withstand frequent switching with a long mechanical and electrical life. Versatile Use – Suitable for domestic, commercial or light industrial electrical distribution boards.
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SKU: NB1-63B2P16
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Product Details

The 16A 2 Pole B Curve 6KA MCB (Model: NB1‑63B2P16) is a reliable miniature circuit breaker designed to protect electrical circuits from overload and short-circuit faults in both domestic and commercial installations. Made to fit easily into standard consumer units and distribution boards, this 2-pole device disconnects both live and neutral poles quickly and safely if current exceeds safe levels. It is ideal for protecting lighting circuits, socket circuits and other standard 230/400V AC circuits up to 16 amps in homes, offices and light industrial environments.

Constructed to comply with recognised safety standards, this MCB features a B-type tripping curve, meaning it trips rapidly when the current reaches approximately three to five times the rated value. This makes it especially suited for circuits where the load is primarily resistive, such as lighting and small appliances. With a 6 kA breaking capacity, it can safely interrupt fault currents up to 6000 amps, providing dependable protection against short-circuit risks.

The compact, modular design clips onto a 35 mm DIN rail for quick installation and can be connected from the top or bottom, giving flexibility during wiring. The device is made from durable, high-quality insulating materials that deliver consistent performance over time, with IP20 protection to guard against dust and accidental contact. Rated for reliable operation in ambient temperatures from -5 °C to +40 °C, it performs well across typical indoor environments.

This NB1‑63 series MCB also offers multiple connection options suitable for cable and busbar systems and supports terminal capacity for cables up to 25 mm². With a mechanical life of up to 20,000 operations and an electrical life of around 4,000 operations, it stands up to ongoing switching without compromise. Whether you are building a new electrical panel or upgrading your consumer unit, the NB1‑63B2P16 delivers trusted circuit protection at a competitive price.

Product Specifications

Electrical Specifications

  • Model: NB1-63B2P16
  • Rated Current (In): 16A
  • Number of Poles: 2P
  • Tripping Curve: B Curve (3-5 In)
  • Rated Voltage (Ue): 400V / 415V 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
  • Terminal Size (Busbar): Up to 10mm²
  • Tightening Torque: 2.5 N·m
  • 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: 36mm (2 modules)
  • Height: 86mm
  • Overall Depth: 78mm

Key Features

  • Versatile Application: Suitable for domestic installations as well as commercial and industrial electrical distribution systems.
  • Integrated Safety: Features a trip-free mechanism, ensuring the device operation cannot be defeated by holding the operator in the "ON" position.
  • Advanced Cooling: Designed with a heat dissipation gap to provide better cooling during operation.
  • Visual Monitoring: Equipped with a color-coded contact position indicator that provides 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 busbar connections.

Standards & Compliance

  • 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
16A 2 Pole B Curve 6KA MCB (NB1‑63B2P16) - Manual
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