Where to buy a 40amp circuit breaker?

Otter

Otter

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I've googled, amazoned and ebayed but can't find one - it's recommended for a Raymarine autopilot installation - or would a 40amp fuse be OK? Maybe they think it will be tripping when it's overloaded??? Anyway, can anyone point me to a place to buy a breaker? Ideally it would be rail mounted to fit neatly.

Thanks.
 
The Lazy Kipper said:
I've googled, amazoned and ebayed but can't find one - it's recommended for a Raymarine autopilot installation - or would a 40amp fuse be OK? Maybe they think it will be tripping when it's overloaded??? Anyway, can anyone point me to a place to buy a breaker? Ideally it would be rail mounted to fit neatly.

Thanks.
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Merlin Powerstore http://www.power-store.com/index.asp BEP marine ones, but maybe not rail mounted
 
TSB240 said:
My business builds industrial controls and we regularly use Standard MCBs for protection of DC Circuits.

We use these in preference to fuses.
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Do you mean standard 240v MCB's? That's what another electrician had said to me but I assumed I had mistaken him. So assuming I've understood, does that mean a 40amp 240v MCB or a 2amp 240v MCB (allowing for the voltage difference).
 
The Lazy Kipper said:
I've googled, amazoned and ebayed but can't find one - it's recommended for a Raymarine autopilot installation - or would a 40amp fuse be OK? Maybe they think it will be tripping when it's overloaded??? Anyway, can anyone point nevada pools incme to a place to buy a breaker? Ideally it would be rail mounted to fit neatly.

Thanks.
Click to expand...

The first thing I thought of was Best Buy or Radio shack but then I remember'd that it needs to be marine proof... :cool:

Maybe look into some of the resources listed above.
 
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The Lazy Kipper said:
Do you mean standard 240v MCB's? That's what another electrician had said to me but I assumed I had mistaken him. So assuming I've understood, does that mean a 40amp 240v MCB or a 2amp 240v MCB (allowing for the voltage difference).
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If Raymarine say 40 amp they mean 40 amp. MCB or fuse your choice

You do not need it to be rated for use on 240 volts but you are likely to find in practice that they are rated for 240 volts AC but only 12 or 24 volts DC. Be sure that the MCB you do use is rated for 12 volts DC
 
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You could search on eBay for Carlingswitch 40Amp and you should see the marine version of the Carlingswitch circuit breaker.

On board, my Autohelm has a big 'pull for on' button (for a Type 2 linear drive).. I'll check out the make this evening if needed..
 
The Lazy Kipper said:
Do you mean standard 240v MCB's? That's what another electrician had said to me but I assumed I had mistaken him. So assuming I've understood, does that mean a 40amp 240v MCB or a 2amp 240v MCB (allowing for the voltage difference).
Click to expand...

MCB or miniture circuit breakers as fitted in most consumer units are suitable for DC.

You do not need to take into account voltage in selection.

The MCB trip amps is the same if it is protectings 40 amps on a 240 volt, 400v, 12v, 24V or whatever V? circuit.
They are usually thermally operated and it is purely the amps that causes them to trip.

They are usually DIN rail mounted.

For marine use I have taken the usual precautions and mount them in a watertight enclosure to protect from damp. A piece of Din rail in a sealable plastic enclosure with good cable glands is quite sufficient. add some silica gel crystals if you want..

As usual the Marine tag is just putting £s on the cost.

There are different trip characteristics and we usually specify C rating for normal loads. D rating is more suited to motor protection where there are higher start up currents in contrast to steady running.

Basically where you currently have a fuse you could replace it with a single pole MCB of the same capacity.

Steve
 
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