From the EVDL email list:
Subject: Re: [EVDL] Small Hi Voltage DC fuses?
Date: October 26, 2008 8:02:18 PM PDT
Those would work, but an RK5 fuse is rather large at about .75 diameter and
nearly six inches long. A better choice might be a Bussmann KLM or a
Littelfuse KLKD series fuse. You could also use a miniature ABC series fuse,
but not its cousin, the ubiquitous AGC (glass) fuse. When selecting
overcurrent protection for any circuit there are about four factors which
have to be considered: voltage, amperage, interrupting rating, and response
curve. When you get above 32 volts DC for a miniature fuse, or about 65-80
volts DC for a breaker you really have to start looking at whether the thing
is rated for DC and at what voltage and short circuit current rating. Some
breakers and fuses don't even have a DC rating.
The manufacturer's data sheets will tell whether or not a given fuse or
breaker even has a DC rating, and if so what voltage and current it is rated
to break. For example, I have some 80 amp breakers made for photovoltaic
applications which are only rated at about 60 volts DC and a maximum input
current of 200 amps. This means that they would not be suitable for EV use
because the low interrupting rating would typically be exceeded by all but
the wimpiest batteries. Other breakers require multiple poles to be
connected in series in order to get up beyond their 80 volt rating and it is
not uncommon to see a breaker which is rated at 480 VAC derated to only
150VDC. Unfortunately the cantankerous nature of direct current makes it
much tougher to open the circuit under load and have the overcurrent
protective device (or switch) clear the circuit without being destroyed in
>Something like this?
>>On Oct 21, 2008, at 10:06 AM, John G. Lussmyer wrote:
>>I'm looking for some fuses for pack voltage (up to 160VDC), that only
>>need to be 1A (or even less).
>>Anyone know where I can find such fuses?