GE heavy duty safety switches are designed for commercial and industrial applications where safety, high performance and continuity of service are essential. Heavy duty switches are available in 30 to 1200 A, 600 Vac, 600 Vdc maximum, fusible and non-fusible units and in NEMA Type 1 (indoor), Type 3R (outdoor), Type 4/4X (water and dust-tight, corrosion resistant) and Type 5/12 (drip and dust-tight) enclosures. When used with Class R or J fuses, 30 to 600 A switches have a UL Listed short circuit rating of 200000 A rms symmetrical. Switches rated 800 to 1200 A use Class L fuses and have a UL Listed short circuit rating of 100000 A rms symmetrical. GE heavy duty safety switches are UL Listed as service entrance equipment when installed in accordance with the National Electrical Code.