Hot Rods Battery fuse

The sustained rating is for a "slow blow" fuse which can take a momentary spike above the 20 amp.
The 150 amp rating is the absolute safety limit for a spike then it blows.

Slow blow fuses are very common in Audio. They are coiled like a filament in a light bulb.
They are normally rated like 17/35 or in your case 20/150

Here's a slow blow fuse

Vs a normal fast acting fuse


It's a "Lucas" necessity

 

I don’t think I’ve ever seen a slow blow fuse rated for 20 amps and 150 amps. Maybe 20 amps and 35 amps. But I don’t think 20 will reach 150.

Also I went and looked at the Mr. Gasket battery switches and they are rated at 20 amps continuous and 125 intermittent. I think that’s what he is talking about. ......maybe.







Bones

 

Pretty sure the directions used the term fused. I thought it was odd too. I'll double check the paperwork.
Thanks for all the input

 

Fuse's "blow". Fuseable links melt.

 

Well actually they both “ melt” that’s how they both protect the circuit, when the resistance gets too great and raises the temperature to the melting point of the fuse material. The main difference is usually the “ fuses” are in a protective case of some sort, gl***, plastic, etc. The fuseable link usually just has its insulation, similar to wire insulation, for protection, and sometimes that isn’t enough!






Bones

 

Fuesable links cause fires when they are wired ,wrapped into a wiring harness or laying on something that will burn.. When they blow or melt if wrapped in a harness they will ignite the plastic or cloth coating on the harness and create more shorts. A fuse link when used correctly is wired out and away from any other wires so it burns off or blows and stops power flow to its circut.

 

You are correct. I looked at the instructions again and it does say rated. Not sure how I came up with the fused terminology. Dementia setting possibly.


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