Mitsubishi Electric FR-D720-0.4K Instruction Manual page 311

●Instructions for UL and cUL
Wiring protection
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit
protection must be provided in accordance with the National Electrical Code for the U.S. or the
Canadian Electrical Code for Canada and any additional codes. As specified, UL Class T, Class J,
Class CC fuses or any faster acting fuse with the appropriate rating or Listed UL 489 Molded Case
Circuit Breaker (MCCB) must be employed.
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