Tweco 300 TS Arcmaster(Feb2006) - Manual (Page 20)

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Input Voltage Fuse Size
208 VAC 100 Amps
230 VAC 90 Amps
460 VAC 30 Amps
Table 1 - Electrical Input Connections
NOTE: Fuse size is based on not more than 200 percent of the rated input amperage of
the welding power source (Based on Article 630, National Electrical Code).
Figure 3. Electrical Input Connections