Taco SR502 2 Zone Switching Relay For Pumps (Not For Use With Zone Valves) Specifications: Product Number Number SR502 Number of Zones 2 (Includes A Priority Zone) Transformer Voltage 120 VAC Input Maximum Combined Load 15 Amps Dimensions of Enclosure Width 10 1/4" X Height 6-3/4” X Depth 2-3/4” Features: External Indicator Lights Priority Zone Simplified Wiring Fully Enclosed Snap-Out Relays Compact Design Fuse Protected 100% Factory Tested Isolated End Switch Contractor Friendly PC Board Layout Universal Thermostat Compatibility UL Approved 24 volt Power Input or Output Terminal Extended 3 Year Warranty Made in the USA