Ring connectors amp rating (1 Viewer)

[CamperJack]

I am looking at ring connectors for the electrical wiring.

For example I will need a ring connectors to attach to the 30A battery to battery charger, via a midi fuse, to the batteries.

For this I will need two M5 connectors to attach the wire to the fuse. And a mate or M6 to attach to the battery terminal studs.

The problem is the fuse is rated at 30A to protect the 30A B2B. But I can only find 15A connectors, like the ones below from Halfords. Surely a 15A connector will melt before the fuse.

Are there higher amp rated connectors out there, or am I missing the point entirely?

Also, nowhere does it mention what size wire these connectors take. And my wire size will vary - I'll be using 3, 6, 10 and 35mm cables.

Halfords Ring Connectors (HEF142) 15 Amp/5mm | Halfords UK

Shop the latest Halfords Ring Connectors (HEF142) contains 3 x 15 amp, insulated ring connectors with a 5mm diameter at Halfords UK

www.halfords.com

I didn't think simply buying the connectors would be this complicated!

 

[CamperJack]

Interesting that this site automatically changes the the letter m followed by the number 8 to the word mate??

 

[Stealaway]

Yellow ones could be OK - Or any amount here.

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[Gizmouk]

Used to use (up to) 2000A ring crimps, so 30A are a doddle

30A 5mm ring crimps:

https://cpc.farnell.com/pro-power/st2-5-0-10pk/ring-terminal-blue-m5-30a-10-pk/dp/CN11373

 

[Richard n Ann]

I made my own this won't be melting

 

[CamperJack]

Yellow ones could be OK

What, if any, is the significance of colour? Are different colours for different size wires? How do you know which size wire will fit in the lugs?

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[CamperJack]

Used to use (up to) 2000A ring crimps, so 30A are a doddle

30A 5mm ring crimps:

https://cpc.farnell.com/pro-power/st2-5-0-10pk/ring-terminal-blue-m5-30a-10-pk/dp/CN11373

Brill. Thanks!

But how do you know what size wire will fit in these?

 

[Richard n Ann]

Are different colours for different size wires?

Yes blue is for up to 2.5mm cable

 

[Gizmouk]

Brill. Thanks!

But how do you know what size wire will fit in these?

How long is the cable run (length) ?

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[Lenny HB]

Forget about small ring terminals for high current for a start you won't be able to get the size cable into them that you require.

What you need are these, I use them for my battery connections.
https://rover.ebay.com/rover/1/710-...0001&campid=5338547443&icep_item=122666453146

Crimp tools are cheap enough.

8T Hydraulic Crimper Tool for sale | eBay

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[Gromett]

I have this in my notes. I can't confirm the source but it has proven sufficient over the years of using them

15A Red
20A Blue
25A Yellow

Not all crimp connectors are made equal...

Anything above 25A I go for full blown crimps, however these require a proper crimping tool to do it properly.

I am not recommending this particular supplier, but this is what I would use for anything above 15-20 amps myself.

https://rover.ebay.com/rover/1/710-...0001&campid=5338547443&icep_item=122753101700

 

[Gromett]

PS: For heavy duty crimping tool I bought one of these. (Not from this supplier)

https://rover.ebay.com/rover/1/710-...0001&campid=5338547443&icep_item=383226949283

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[thebriars]

Anything above 25A I go for full blown crimps, however these require a proper crimping tool to do it properly.

I am not recommending this particular supplier, but this is what I would use for anything above 15-20 amps myself.

https://rover.ebay.com/rover/1/710-...0001&campid=5338547443&icep_item=122753101700

Toolstation also sell these crimp lugs. For a proper job you also need heatshrink to go over the crimped end.

 

[Gromett]

Forget about small ring terminals for high current for a start you won't be able to get the size cable into them that you require.

What you need are these, I use them for my battery connections.
https://rover.ebay.com/rover/1/710-...0001&campid=5338547443&icep_item=122666453146

Crimp tools are cheap enough.

8T Hydraulic Crimper Tool for sale | eBay

Find great deals on eBay for 8T Hydraulic Crimper Tool. Shop with confidence.

www.ebay.co.uk

I had opened this thread but hadn't replied some time ago (got distracted by a work thing). Made my reply then noted you had posted pretty similar..

I do like the look of that hydraulic crimping tool though. Didn't realise they had come down in price so much.

 

[Gromett]

Toolstation also sell these crimp lugs. For a proper job you also need heatshrink to go over the crimped end.

Depends on use case. If they are inside a shrouded piece of equipment like a charger or B2B system I tend not to bother. If on the battery I also tend not to bother as I have a cover on the battery box itself.

However, if it is in a cupboard where the public can access it during normal day to day situation then I would go with the heatshrink AND some form of covering for the bolt head. Heatshrink may protect the shank of the lug but won't do anything for the bolt unfortunately.

It does look nicer though

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[Lenny HB]

I do like the look of that hydraulic crimping tool though. Didn't realise they had come down in price so much.

I have one of the cheap ones, works really well.

 

[Gromett]

I have one of the cheap ones, works really well.

For tools I use a lot I always go for decent quality ones. But for stuff I rarely use the cheap ones suffice. I already have the manual one so will probably stick with that. Although the hydraulic one does look more compact.

 

[thebriars]

For tools I use a lot I always go for decent quality ones. But for stuff I rarely use the cheap ones suffice. I already have the manual one so will probably stick with that. Although the hydraulic one does look more compact.

I have a cheapo hydraulic one, and at under £20 it does the job perfectly for the number of crimps I use.

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[thebriars]

Depends on use case. If they are inside a shrouded piece of equipment like a charger or B2B system I tend not to bother. If on the battery I also tend not to bother as I have a cover on the battery box itself.

However, if it is in a cupboard where the public can access it during normal day to day situation then I would go with the heatshrink AND some form of covering for the bolt head. Heatshrink may protect the shank of the lug but won't do anything for the bolt unfortunately.

It does look nicer though

I'm a perfectionist.

 

[Richard n Ann]

The hydraulic crimpers are as cheap as chips. I've got some hydraulic benders that were £400

 

[CamperJack]

I was really struggling to get this done but once again you guys have sorted me out.

I'm always amazed by how freely and quickly people here are to help me out. Thank you everyone! Especially to those who took the time to send me links.

I have ordered some lugs and some of the hydraulic crimpers. There's another £50 odd gone on bits. These conversions eat money!

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[Lenny HB]

I have ordered some lugs and some of the hydraulic crimpers. There's another £50 odd gone on bits. These conversions eat money!

You won't regret it, makes the job easy and satisfying it's done properly.
Don't forget to get some heat shrink sleeving, even if you don't need to insulate the connections for a few pence makes a much neater job.

I've only ever done 10-15 crimps with my crimpers but they were worth it.

 

[eddie]

Once you've had hydraulic, you'll never go back!

Fits in lockers too lol

 

[CamperJack]

Don't forget to get some heat shrink sleeving

I've got some of that in the garage.

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[LesW]

If you have multiple leads connected to your battery, these a good Idea, I have them on my (self built) car.

 

[thebriars]

I have ordered some lugs and some of the hydraulic crimpers. There's another £50 odd gone on bits. These conversions eat money!

Much the best option. With larger currents, you can generate quite a resistance across a connection.

 

[Richard n Ann]

If you have multiple leads connected to your battery, these a good Idea, I have them on my (self built) car.
View attachment 398943

Would you still use a ferrule? A jumbo ferrule

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