Hello Jay,
Looking up the specs on Current Limiting, Fast Action and Very Fast Action
fuses in my Bussmann Fuse Catalog, The Fast and Very Fast Action are use for
solid state electronic equipment.
Fast action types only give short circuit protection, not for motor surges or
overloads. A Limitron fuse provides protection for circuit breakers, motors
and transformers that will have current surge when turn on.
A Limitron fuse is can be place between a motor and motor controller that does
not have a Overload Device or Overload Relays. A short circuit in the motor
circuit will protect the motor controller. Used a Semiconductor fuse between
the motor controller and batteries at the full ampere rating of the motor
controller if you are
going to drag race.
Most of my driving at level grade is 200 motor ampere or 66.6 battery ampere.
This becomes 66.6/6 strings of cell = 11.1 ampere per cell.
If the motor controller is only a contactor with overload relays, than you only
need a Limitron fuse between the motor controller and the power supply or
battery pack or commercial power circuit breaker.
I have one 400 amp Limitron fuse between my motor controller and the battery
pack which has now been running since 1980. The motor controller is a 1000 amp
rated, but I have it limited to 600 amp motor surge which is about 600/3 = 200
battery amp.
I have one 400 amp Semi Conductor fuse in the spare fuse holder as a back up
just in case the Limitron fuse dies of old age.
There is 6 strings 54 LI Ion cells parallel rated at 33.3 ah each or 199.8 ah
for 226.8 maximum battery pack voltage.
Thus if my motor controller surge is set to 600 amps, the battery amps become
200 amps and each cell ampere load is 200/6 = 33.3 amp which is the same as the
cell ah rating.
According to my battery, BMS, motor controller and battery charger dealers, the
batteries will have a easy life.
I see if I can break by 10 year battery life on my first pack that lasted from
1976 to
1986.
Roland
----- Original Message -----
From: Jay Summet via EV<mailto:[email protected]>
To: Electric Vehicle Discussion List<mailto:[email protected]>
Sent: Thursday, January 07, 2016 6:50 PM
Subject: [EVDL] Pack HV Fuse question
I have obtained a surplus fuse, new old stock.
Buss JKS 400
Bussman Limitron
Quick-Acting
Current-Limiting
FUSE
JKS 400
Class J Fuse
Interrupting Rating
200,000 amp. rms sym.
600v or less A.C.
I was wondering if it would be suitable to act as a mid-pack fuse on my
128 VDC LiIon Leaf Module pack?
I found the following documentation, but it may be for a newer version
of the fuse:
http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/product-datasheets-b/Bus_Ele_DS_1027_JKS_70-600A.pdf
If I'm reading the graph right tt looks like the fuse would take 10
seconds at 1000 amps to melt?
I already have a 400 amp fuse up front with the motor controller. (it's
a Littelfuse L25S-400 )
People who know what "class J" and "quick-acting" vs "very fast-acting"
care to comment?
Jay
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