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Littelfuse’s Industrial Shock Block (ISB) is designed to meet the requirements for special-purpose GFCIs defined by UL 943C. Class C GFCIs are intended to be used on three-phase systems where the line-to-line voltage is 480 V or less with a trip level of 20 mA, while Class D GFCIs are intended to be used on 600 V systems. The ISB is available as a Class A GFCI for construction sites with wet areas to meet NEC 210.8(B).
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