SanRex SANARG 300AP, Operator'S Manual

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3.05.02 Fusing
The 300AP is equipped with an input switch and does not have and input circuit breaker for protection.
It is the responsibility of the user to provide proper fuse protection for the welding power source.
Failure to do so will void the warranty.
NOTE:
Maximum fuse size should be such that the fuse value not be more than 200 percent
of the rated input amperage of the welding power source. (Based on Article 630,
National Electrical Code).