ZeroDT 120-1$249.00PriceExcluding Sales TaxQuantity*Add to CartBuy NowField Instrument / Sensor Surge Protection, SASD, 120 VAC, single loop protection for AC/DC power or communications (4-20 mA, RS-485/RS-232) . UL 497B and UL 121201 (Class 1, Div 2) Listed.