ZSR103 | Zone Pump Relay 3 Zone | Caleffi Size_19-1/2IN The limit switch

The limit switch

making them a versatile solution for various systems

and extra heavy cast iron - Dimensions: 3-inch diameter

making it easy to set and adjust temperature parameters as needed

Its precise design conforms to OEM standards

ZSR103 | Zone Pump Relay 3 Zone | Caleffi Size_19-1/2IN The limit switchCaleffi Zone Pump Relay (ZSR103) The Caleffi ZSR103 Zone Pump Relay provides precise control and sequencing for up to three zones in hydronic heating and cooling systems. Its compact design and easy to use interface make it ideal for both residential and commercial applications. Key Features: Controls up to three zones independently Adjustable time delays for pump sequencing LED indicators for clear status monitoring Built in dry contacts for remote