Mike, 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 11/17/0210:51 AM11/17/0210:51 AM
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.