Mill duty safety switches are designed specifically for the rugged conditions found in steel mills, cement foundries and other process-related environments. Mill duty switches are available in 30-600 amps, 600 Vac, 600 Vdc maximum, fusible and non-fusible units, and in NEMA Type 4/4X (water and dust-tight, corrosion resistant) and Type 12 (drip and dust-tight) enclosures.