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D221NRB Safety Switch 250V/Outdoor 30A 2 Pole General Duty Safety Switches General duty safety switches are designed for residential and commercial applications where economy is a prime consideration. Typical loads are lighting air conditioning and appliances. They are suitable for use as service equipment when equipped with a factory-installed neutral assembly or a field-installed service grounding kit. General duty safety switches are UL Listed File E2875 and meet or exceed the NEMA Standard KS1. 400 and 600 A general duty switches NEMA 1 only will accept Class J fuses and are UL Listed for use on systems with up to 100000 RMS symmetrical amperes available fault current. 600 A requires Class J fuse kitGDJK600. 400 A requires moving load base. Class T 400C800 A general duty safety switches use 300 Vac Class T fuses and are UL Listed for use on systems with up to 100000 RMS symmetrical amperes available fault current.