Thermal Arc ARCMASTER 300 MST Operating Manual page 20

Input Voltage
208 VAC
230 VAC
460 VAC
Table 1 – Electrical Input Connections
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).
Note 4
Figure 3. Electrical Input Connections
14
Fuse Size
100 Amps
75 Amps
50 Amps