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What classes of fuses do the DT321 and DT321RB safety switches accept?
Issue:
Fuse data

Product Line:
Safety switches

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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