Square D (Schneider Electric) XACS102 Harmony Contact Block. Schneider Electric Harmony Square D Contact Block, Single, Series: XACS, For Use With: Harmony XAC Medium Duty Pendant Station, Specifications: 600 VAC, 10 A, Base Mount, Spring Return, Screw Clamp Terminal, 1NC, 40 W, -25 to 70 deg C, Slow-Break Contact. Additional Description: SQD -XACS102 PENDANT STATION CONTACT 600VAC 10 A XAC 10 A XAC. Catalog Description: Harmony XAC, Single contact block, spring return, screw clamp terminal, 1 NC.