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What class of fuses are used in the QMB325W branch switch?

Issue:
Product design feature

Product Line:
QMB Branch Switches

Cause:
Fuse type

Resolution:
The QMB325W accepts Class H or K fuses as standard. Other fuse options include Class R fuses(field install Class R Fuse Kit QMB4060R) and Class J fuses (Field relocate the fuse base assembly to the alternate position marked in the enclosure). With Class H or K fuses installed, the switches are UL listed for use on systems with up to 10,000 RMS Symmetrical Amperes available fault current. With Class R fuses (and QMB4060R fuse kit installed) or Class J fuses installed, the switches are UL listed for use on systems with up to 200,000 RMS Symmetrical Amperes available fault current.

The QMB325W takes up 15 inches of vertical mounting space.


NOTE: DO NOT USE RENEWABLE LINK FUSES IN SQUARE D SAFETY SWITCHES. The use of renewable link fuses may adversely affect user safety, impair reliability and will void the UL Listing and Warranty.


 
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