Chint Miniature Circuit Breakers 6kA

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Chint NB1 miniature circuit breakers, known as MCB's can be used in Chint consumer units and Chint distribution boards. They can also be used as standalone devices as they are din rail mountable.

MCBs provide circuit protection and are use for power distribution. The NB1 Series is available in various pole types, current ratings and tripping curves.

  • Features

    The Chint range of NB1 circuit breakers are available in a choice of poles, current ratings, tripping curves and breaking capacities; please choose from the product options. Miniature circuit breakers (known as MCBs) can be used in Chint consumer units, Chint distribution boards or as standalone devices to provide circuit protection.

    They are din rail mountable and come with a 5 year guarantee period. Chint MCBs are a reliable and affordable range of circuit protection devices that we have sold for over 14 years.


    • Tripping characteristics:
      B Type, ideal for domestic or light commercial use.
      C Type, for industrial use were inductive loads are present, will trip between 5 and 10 times the full load current.
      D Type, used in applications that have a very high inrush current such as motors and transformers.
    • Chint circuit breakers are a budget priced alternative to Schneider, Wylex, MEM, Dorman Smith. Square D etc.
    • Operating voltage: 230/415V AC 50/60Hz and DC voltages up to 110V (suitable for boats)
    • Breaking capacity: 6kA. Also available in 10kA. 6kA is the popular choice for domestic use.
    • Din rail mountable MCB.
    • Ambient operating temperature: -5 to +40℃
    • Manufacturer: Chint
    • Guarantee: 5 years
  • Specifications & Dimensions
    Amp Rating
    Breaking Capacity 6 kA
    Dimensions Located Below Specifications Table
    Material Plastic
    Product Type
    Sku NB1-63***P**
    Tripping Curve
    230V AC
    5 Years

    Single Pole

    • Width: 18mm wide (one modular width).
    • Height: 86mm
    • Depth: 77mm (including switch)

    Double Pole

    • Width: 36mm wide (two modular width).
    • Height: 86mm
    • Depth: 77mm (including switch)
    Triple Pole
    • Width: 54mm wide (two modular width).
    • Height: 86mm
    • Depth: 77mm (including switch)
    Four Pole
    • Width: 72mm wide (two modular width).
    • Height: 86mm
    • Depth: 77mm (including switch)
  • 33 Reviews Rating: 91%
  • Product Questions & Answers 4

    Product Questions & Answers

    Set Descending Direction
    Can you tell me whether these are compatible with either MK or Wylex units, that is does the connection on the busbar below line up with either of these?
    Question by: Roger Michael Meyts on 5 Aug 2022, 08:40
    We don't recommend fitting different brands of MCBs in different boards.
    Answer by: Chris Horridge (Admin) on 5 Aug 2022, 09:50
    Good afternoon
    Are all Chint RCD'S ok for use on 110v supplies, ?
    Kind regards, mr k mead
    Question by: kevin mead on 3 Jan 2023, 14:49
    The specifications state that the Rated voltage Ue is: 230/400~240/415V
    Answer by: Chris Horridge (Admin) on 4 Jan 2023, 08:04
    Are the nb1 mcb's type suitable for use on 12v dc distribution on a narrowboat?
    Question by: Paul Brough on 22 Mar 2023, 18:14
    I've checked this with Chint and they said:

    Most certifications are only tested up to a max voltage.

    I know the factory have only tested these down to 24vDC internally.

    On that basis I’m going to say no.
    Answer by: Chris Horridge (Admin) on 23 Mar 2023, 09:08
    Good afternoon can your Chint d/pole mcbs be used ok on supplies of 110v ? kind regards kevin mead louth transformer co ltd
    Question by: kevin mead on 15 Dec 2022, 12:09
    I've double checked with Chint and they said: Yes, all of our MCBs can be used at 110V AC.
    Answer by: Chris Horridge (Admin) on 16 Dec 2022, 06:43

    4 Item(s)

    Show per page
  • Data Sheets & Brochures
  • Product Codes
    SKUPolesAmp RatingTripping Curve
    NB1-63B1P011 Pole1B
    NB1-63C1P011 Pole1C
    NB1-63D1P011 Pole1D
    NB1-63B1P021 Pole2B
    NB1-63C1P021 Pole2C
    NB1-63D1P021 Pole2D
    NB1-63B1P031 Pole3B
    NB1-63C1P031 Pole3C
    NB1-63D1P031 Pole3D
    NB1-63B1P041 Pole4B
    NB1-63C1P041 Pole4C
    NB1-63D1P041 Pole4D
    NB1-63B1P061 Pole6B
    NB1-63C1P061 Pole6C
    NB1-63D1P061 Pole6D
    NB1-63B1P101 Pole10B
    NB1-63C1P101 Pole10C
    NB1-63D1P101 Pole10D
    NB1-63B1P161 Pole16B
    NB1-63C1P161 Pole16C
    NB1-63D1P161 Pole16D
    NB1-63B1P201 Pole20B
    NB1-63C1P201 Pole20C
    NB1-63D1P201 Pole20D
    NB1-63B1P251 Pole25B
    NB1-63C1P251 Pole25C
    NB1-63D1P251 Pole25D
    NB1-63B1P321 Pole32B
    NB1-63C1P321 Pole32C
    NB1-63D1P321 Pole32D
    NB1-63B1P401 Pole40B
    NB1-63C1P401 Pole40C
    NB1-63D1P401 Pole40D
    NB1-63B1P501 Pole50B
    NB1-63C1P501 Pole50C
    NB1-63D1P501 Pole50D
    NB1-63B1P631 Pole63B
    NB1-63C1P631 Pole63C
    NB1-63D1P631 Pole63D
    NB1-63B2P012 Pole1B
    NB1-63C2P012 Pole1C
    NB1-63D2P012 Pole1D
    NB1-63B2P022 Pole2B
    NB1-63C2P022 Pole2C
    NB1-63D2P022 Pole2D
    NB1-63B2P032 Pole3B
    NB1-63C2P032 Pole3C
    NB1-63D2P032 Pole3D
    NB1-63B2P042 Pole4B
    NB1-63C2P042 Pole4C
    NB1-63D2P042 Pole4D
    NB1-63B2P062 Pole6B
    NB1-63C2P062 Pole6C
    NB1-63D2P062 Pole6D
    NB1-63B2P102 Pole10B
    NB1-63C2P102 Pole10C
    NB1-63D2P102 Pole10D
    NB1-63B2P162 Pole16B
    NB1-63C2P162 Pole16C
    NB1-63D2P162 Pole16D
    NB1-63B2P202 Pole20B
    NB1-63C2P202 Pole20C
    NB1-63D2P202 Pole20D
    NB1-63B2P252 Pole25B
    NB1-63C2P252 Pole25C
    NB1-63D2P252 Pole25D
    NB1-63B2P322 Pole32B
    NB1-63C2P322 Pole32C
    NB1-63D2P322 Pole32D
    NB1-63B2P402 Pole40B
    NB1-63C2P402 Pole40C
    NB1-63D2P402 Pole40D
    NB1-63B2P502 Pole50B
    NB1-63C2P502 Pole50C
    NB1-63D2P502 Pole50D
    NB1-63B2P632 Pole63B
    NB1-63C2P632 Pole63C
    NB1-63D2P632 Pole63D
    NB1-63B3P013 Pole1B
    NB1-63C3P013 Pole1C
    NB1-63D3P013 Pole1D
    NB1-63B3P023 Pole2B
    NB1-63C3P023 Pole2C
    NB1-63D3P023 Pole2D
    NB1-63B3P033 Pole3B
    NB1-63C3P033 Pole3C
    NB1-63D3P033 Pole3D
    NB1-63B3P043 Pole4B
    NB1-63C3P043 Pole4C
    NB1-63D3P043 Pole4D
    NB1-63B3P063 Pole6B
    NB1-63C3P063 Pole6C
    NB1-63D3P063 Pole6D
    NB1-63B3P103 Pole10B
    NB1-63C3P103 Pole10C
    NB1-63D3P103 Pole10D
    NB1-63B3P163 Pole16B
    NB1-63C3P163 Pole16C
    NB1-63D3P163 Pole16D
    NB1-63B3P203 Pole20B
    NB1-63C3P203 Pole20C
    NB1-63D3P203 Pole20D
    NB1-63B3P253 Pole25B
    NB1-63C3P253 Pole25C
    NB1-63D3P253 Pole25D
    NB1-63B3P323 Pole32B
    NB1-63C3P323 Pole32C
    NB1-63D3P323 Pole32D
    NB1-63B3P403 Pole40B
    NB1-63C3P403 Pole40C
    NB1-63D3P403 Pole40D
    NB1-63B3P503 Pole50B
    NB1-63C3P503 Pole50C
    NB1-63D3P503 Pole50D
    NB1-63B3P633 Pole63B
    NB1-63C3P633 Pole63C
    NB1-63D3P633 Pole63D
    NB1-63B4P014 Pole1B
    NB1-63C4P014 Pole1C
    NB1-63D4P014 Pole1D
    NB1-63B4P024 Pole2B
    NB1-63C4P024 Pole2C
    NB1-63D4P024 Pole2D
    NB1-63B4P034 Pole3B
    NB1-63C4P034 Pole3C
    NB1-63D4P034 Pole3D
    NB1-63B4P044 Pole4B
    NB1-63C4P044 Pole4C
    NB1-63D4P044 Pole4D
    NB1-63B4P064 Pole6B
    NB1-63C4P064 Pole6C
    NB1-63D4P064 Pole6D
    NB1-63B4P104 Pole10B
    NB1-63C4P104 Pole10C
    NB1-63D4P104 Pole10D
    NB1-63B4P164 Pole16B
    NB1-63C4P164 Pole16C
    NB1-63D4P164 Pole16D
    NB1-63B4P204 Pole20B
    NB1-63C4P204 Pole20C
    NB1-63D4P204 Pole20D
    NB1-63B4P254 Pole25B
    NB1-63C4P254 Pole25C
    NB1-63D4P254 Pole25D
    NB1-63B4P324 Pole32B
    NB1-63C4P324 Pole32C
    NB1-63D4P324 Pole32D
    NB1-63B4P404 Pole40B
    NB1-63C4P404 Pole40C
    NB1-63D4P404 Pole40D
    NB1-63B4P504 Pole50B
    NB1-63C4P504 Pole50C
    NB1-63D4P504 Pole50D
    NB1-63B4P634 Pole63B
    NB1-63C4P634 Pole63C
    NB1-63D4P634 Pole63D


Free Delivery

Applies to orders over £50 excluding VAT. If the order is below £50 a delivery charge of £5 +VAT will be added for a 1-3 day tracked service.

Guaranteed next working day deliveries are available from £7 +VAT and free for orders over £150 +VAT, depending on the warehouse location. See delivery zones below for Scottish Highlands and International shipping zones. This applies to orders up to 30kg in weight.

Click & Collect

You can collect your order from our warehouse which is located at Unit 4A Buckley Rd Ind Est, Buckley Road, Rochdale, OL12 9EF.

Our warehouse opening hours are:

  • Monday to Thursday: 8AM - 5PM
  • Friday: 8AM to 4PM
  • Saturday: 9AM to 12PM

Courier & Tracking

We use  DPD Local for all of our deliveries apart from heavier palleted goods. If you insert your mobile number at checkout, you will receive a text message to confirm your delivery date the day before the delivery. On the delivery day you'll receive further text updates including a 1 hour delivery slot. If you're not available you can arrange a different date or alternative drop-off point with DPD. Tracking information and order updates will also be available in your customer order area.


DPD Local provide a contact-free delivery service. Our warehouse and delivery network will remain open. This includes lock downs.

Export Information & Brexit

We're proud to offer a worldwide delivery service to any location in the known universe. Simply input your delivery details in the checkout and the shipping costs and relevant taxes will be calculated. A breakdown of delivery costs and zones can also be located below.

Delivery Zones

Zone 0

Standard UK mainland areas. Free delivery on orders over £50 excluding VAT.

Zone 1 UK

Charged at £7 excluding VAT and free on orders over £150 excluding VAT. Includes the following areas:

  • Channel Islands; Guernsey & Jersey (please select these from the Country list (not UK)
  • Isle of Man
  • Isle of Wight
  • Northern Ireland
  • Scottish Highlands, areas which we class as zone 1 are post codes: AB30-38, AB44-56, FK17-99, G83, IV1-28, IV30-32, IV33-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH18-26, PH30, PH31-41, PH49-50
  • Scottish Islands: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA30, PA32-34, PA41-49, PA60-78, PH42-44, ZE1-3

Zone 1 EU - Same rates as Zone UK

  • Republic of Ireland

Zone 2

Charged at £12. Includes the following areas:

  • Austria
  • Belgium
  • Denmark
  • France
  • Germany
  • Luxembourg
  • Netherlands

Zone 3

Charged at £25. Includes the following areas:

  • Czech Republic
  • Italy
  • Slovakia
  • Spain

Zone 4

Charged at £30. Includes the following areas:

  • Estonia
  • Finland
  • Hungary
  • Slovenia
  • Poland
  • Portugal
  • Sweden

Zone 5

Charged at £40. Includes the following areas:

  • Bosnia
  • Bulgaria
  • Croatia
  • Greece
  • Iceland
  • Latvia
  • Lithuania
  • Romania
  • Serbia

Zone 6

Charged at £60. Includes the following areas:

  • Norway
  • Russia
  • Switzerland
  • Ukraine

Zone 7

The rest of the world is charged at £80.

Cut Off & Delivery Times

If your order is placed before 3PM Monday to Thursday and before 2PM on Friday it will usually leave on a next day delivery service. This is providing that all of the items are in stock, we have live stock data on each product on our website. If your order is particularly urgent please choose the next working day option or part shipment option were we ship the items we have in stock and send the rest when they arrive. These as a guaranteed delivery services, if your delivery doesn't arrive, we'll refund the delivery charge. We prioritise next day deliveries over standard orders and will contact you if any goes wrong with the order.

If we are out of stock of any items you will receive a notification by email. If the items are delayed by longer than a week then we will notify you of this. We can also arrange for direct shipments from some of our manufacturers, if we are out of stock and you need something urgently please contact us and we will offer the fastest delivery options.

Next day deliveries are classed as next working day and don't include weekends. We also offer Saturday AM and Saturday all day services which are available at the checkout for zone 0 addresses. A Sunday service is also available on request, or you can place a Saturday delivery and change the delivery date directly with DPD via their App after you receive your tracking information.

Returns can now be generated within the customer order area here. Simply select your order from the dropdown menu along with a reason for return. Your return will then get processed quickly and efficently. Alternatively email us at: [email protected] with your order number and reason for return and we'll send you a returns authorisation form.

Returns & Cancellations

If you’re not satisfied with your goods and would like to return them, we will accept them back at the customer's expense. All unwanted goods must be returned in 100% resalable condition and within 30 days. Resalable condition includes no markings on the wires or terminals and no damage to the packaging.

To cancel your order please contact us immediately as we process and ship most of orders immediately, we're fast!

How to Return

Please log-in to your account and follow the simple process to generate a returns request. Or email our team at: [email protected]. We recommend returning goods using a recorded delivery method.


Refunds will be issued within 14 days of receipt of goods. Refunds of delivery costs will not be issued unless the products are defective.

Shortages & Damaged Goods

Shortages and damaged goods must be notified within 48 hours preferably by email to  [email protected] or Tel: 01706 860011.