What is the maximum recommended fuse or circuit breaker size for the XMT 304?
The maximum recommended standard fuse or circuit breaker rating is 30 amperes for the 400V input model. The unit draws 17.0 input amperes at rated output. This is per the 1996 National Electrical Code (NEC). (Page 17)
From the official Miller XMT 304 Arc Welder manual, page 17
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