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sadibo
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Fuse Naming T2AH250V, T4AL250V

11/10/2008 3:45 PM

I have two fuses in an electronics circuit which includes a motor. One fuse is labelled T4AL250V and is on the incoming power supply. The other is on the circuit board itself and labelled T2AH250V. I know V is volts and A is amps. What does the L and H designate? I've read that slow blow fuses are used on motor circuits where initial start-up power diminishes rapidly. Does that have anything to do with the designations? It also seems these may be non-United States protocol.
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Re: Fuse Naming T2AH250V, T4AL250V

11/10/2008 11:42 PM

Hi, The part number has the following parts:

T indicates a 'transformer' fuse - it is slow-blow and so surge-tolerant - usually found in front of transformers, switch mode power supplies etc.

xA means x Amps rating

H means the casing is Ceramic. I do not know what the L means. (Glass? Or maybe it relates to the fuse size?) Sometimes E is used, which seems to mean glass. Anyway, I guess you could tell casing material and size by looking at the blown units.

250V means 250 Volt rating (AC).

So, T4AL250V is 4A 250V slow blow (?casing?), T2AH250V is 2A 250V with Ceramic casing.
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Re: Fuse Naming T2AH250V, T4AL250V

11/11/2008 8:23 AM

Future plan to follow should you need to find additional fuses:

1. Google the part number.

2. Several suppliers(distributors) sites will appear in the search if the model number is valid and reasonably common.

3. Go to a suppliers (distributors) site and see who makes this particular model number (many manufacurers use similar but slightly different numbers)

4. Go to the manufacturers site and find the model number.

5. Manufacurer will have data sheets/catalog pages that will tell you the fuse is a transformer type, or slow blow, or quick acting, or for inductive loads, etc.

I Googled the first one and it is a model number used by LittleFuse.

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