©2002 Advanced Protection Technologies, Inc. All rights reserved
Short Circuit Current Ratings:
Short Circuit Current Ratings are Important
2002 NEC now requires them
Fuse AIR ratings.
Single fuse AIR testing doesn’t test if the fuse operates
before an MOV ruptures.
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Many TVSS use multiple, parallel fuses.
operation can be
slower compared to
Mismatched fuse AIR and device Short Circuit
Current Ratings are give-aways that fusing doesn’t
clear like it should.
- 200kAIR fuses, but requires external overcurrent
- 300kAIR fuses, but 65kA SCCRs for device
If fuse isn’t
fine by itself
before fuse took it
made for Single