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cartridge fuses #16741
11/16/02 12:46 AM
11/16/02 12:46 AM
mike knight  Offline OP
Junior Member
Joined: Oct 2002
Posts: 5
how do you size a cartridge fuse to fit a particular disconnect? in the switchgear i need fuses it says only "type j" but i'm not sure how to order them so they fit right.

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Re: cartridge fuses #16742
11/16/02 06:43 AM
11/16/02 06:43 AM
sparky  Offline
Joined: Oct 2000
Posts: 5,342
if your disco states type j, then you only need spec voltage & amperage...

Re: cartridge fuses #16743
11/16/02 11:52 AM
11/16/02 11:52 AM
mj  Offline
Joined: Jun 2002
Posts: 186
meriidian, ms
a listed disconnect will indicate the size, type ocpd required.

Re: cartridge fuses #16744
11/16/02 10:27 PM
11/16/02 10:27 PM
Bjarney  Offline
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
An example is

Their Class-J versions [LPJ-series] up to 600A @ 600V and 300,000AIC.

[This message has been edited by Bjarney (edited 11-16-2002).]

Re: cartridge fuses #16745
11/16/02 11:08 PM
11/16/02 11:08 PM
harold endean  Offline
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
Just make sure you follow what the blue print says. You might fail a final inspection if the print calls for a type "J" fuse and you have a type "R" fuse instead.

Re: cartridge fuses #16746
11/16/02 11:26 PM
11/16/02 11:26 PM
Trumpy  Offline

Joined: Jul 2002
Posts: 8,231
SI,New Zealand
What is a j-type fuse?.
We work on the following type fuses,(HRC)
to IEC Requirements:
P1: Semi-conductor Devices Protection- 1.0-
1.1 protection.
Q1: General protection, lighting power.
Q2: General protection Sub-Mains, other Equipment.
R: Motor rated links for 3 Phase or other motors upon start-up.

Re: cartridge fuses #16747
11/17/02 10:51 AM
11/17/02 10:51 AM
Bjarney  Offline
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Trumpy—in general, 600V Class-J fuses are available in "semi-fast" [non-motor]and "slow" time-current curves [motor]. About 10 years ago the interrupting rating of 300KA became available in the US. At that time the justification was that there were a ±dozen US cities with "downtown" electric networks that were so stiff that 200kA interrupting was underrated.


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