NEMA Standards for R-rated medium voltage power fuses require that they operate within 15-35 seconds when subjected to an rms current 100 times the 'R' rating. For example, a fuse with a 2R rating will open within 15 to 35 seconds on an applied current of 2 x 100 = 200 amperes.
Options- Hermetically sealed for use in hazardous locations (add “S” suffix to part number)
- Bolt-in mounting configuration. For hookeye attachment; add ‘W’ suffix to part number.