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K & H RH-21 Prototyping Breadboard - 840 Tie Points

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Brand: K&H Manufacturing  MPN: RH-21 
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Qty Unit Price (Ex VAT)
1+ £12.13
10+ £10.25
50+ £9.46
100+ £8.97

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Additional quantity lead time unreliableContact us for expedited delivery
532 in Stock, despatched same dayAdditional 2,000 due on 13/01/2022

This prototyping board (protobloc 2 breadboard) is a prototyping system offering a total of 840 tie points, consisting of two sets of 64 rows of 5 inter-connected sockets.

Incorporating the following features: protobloc 2, 2 (64 x 5) grid size, 840 number of holes, 0.3 to 0.8mm wire size acceptability, 3A contact current, ABS polymer body material, silver nickel contact material, 4 rows of 50 interconnected sockets suitable for use as power supply rails, all contact positions are clearly defined on an alphanumeric grid.

  • 4 rows of 50 interconnected sockets suitable for use as power supply rails
  • All contact positions are clearly defined on an alphanumeric grid
  • ABS polymer board mounted on a non-removable self-adhesive foam base
  • Can accommodate up to seven 16-pin devices
  • White colour

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*Question functionality currently disabled

13 June 2016 Question by: John | Product code: 34-0655
Q. Will these boards clip together with other K&H Boards? Specifically the 34-0668 Power Block or the 34-0662 AD11.
A. Hi John, thank you for your question. We have physically tried the 3 parts and they are not compatible directly. However multiple 34-0655 can be connected together. 34-0662 comprises the power block fitted to a breadboard of differing dimensions.

25 March 2013 Question by: Nick | Product code: 34-0655
Q. Are these non-magnetic?
A. Hi Nick. Thank you for your question. These PCB prototyping boards are non magnetic.

18 January 2013 Question by: loogmaengaw | Product code: 34-0655
Q. What's the dimension of this board? Is it 16.5 x 5.5cm?
A. Hi loogmaengaw. Thank you for your question. The protobloc 2 breadboard is 171 x 64mm.


Great tool

Reviewed by: Tristan Lester - 25 January 2019
This helped a lot as I experimented in getting the right resistance and configuration. I needed to fit the components into a tight space so this was great for trial and error

Reliable product

Reviewed by: Mr Paul McCarroll - 25 October 2016
I've been using these for many years without issue and have around 200 of them.

This is the one you want

Reviewed by: Mr Kevin Stevens - 09 September 2015
In most cases... If you look at most schematics, about half of the components have a connection to rail. Therefore these ones with 2 rails next to every row of uncommitted contacts is going to be the best to use. For the money its acceptable to consider them as single-use breadboards, cheap compared to any other prototyping means. However, they are totally re-useable. I wouldn't expect any of these types of breadboards to be reliable forever, none have gold-flashed contact surfaces, but that's the point isn't it - they're a quick breadboard to get you started.


Reviewed by: Mr Richard Rice - 01 July 2015
The quality is fine, and for the price the product works very well.