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What Class of fuse does the H221, H221NRB, H321N and H321NRB and safety switches accept?

Issue:
Product design feature

Product Line:
Heavy Duty Safety Switches

Cause:
Fuse type

Resolution:

These switches accept Class H or K fuses as standard. Options include Class R fuses (field install Class R Fuse Kit). 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 Class R Fuse Kit installed) the switches are UL listed for use on systems with up to 200,000 RMS Symmetrical Amperes available fault current.

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 warranty.

 
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