Caleffi ZSR103 Z-One 3-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC

Roll over image to zoom in Click on image to zoom

Caleffi ZSR103 Z-One 3-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC

Name: Caleffi ZSR103 Z-One 3-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC
Brand: Caleffi
SKU: CALE-ZSR103
Price: 240.99 USD
Availability: InStock

CaleffiSKU: CALE-ZSR103

Price:

$240.99

Stock:

Re-stocking soon

Quantity:

Special order — typically ships in 1–3 weeks.
Contact us for an exact lead time.

Questions? Call (404) 678-9908 or chat with us.

Need 10+ or a project quote? Request a quote · Pros: open a trade account

Free shipping on orders $99+ · 30-day returns · Manufacturer warranty

Shipping details

Shipping weight: 3.2 lb
Box size: 12.5 × 12.15 × 3.4 in

Type	Zone Pump Controls

The Caleffi ZSR103 Z-One is a 3-zone switching relay that controls circulator pumps in a zoned hydronic heating system, with priority and 120VAC input.

Each thermostat call starts the matching zone circulator and sends a heat demand to the boiler. The priority function lets one zone, typically indirect domestic hot water, take precedence over the others. The control is expandable for systems that need more zones, and each pump circuit is rated at 5 amps. The enclosure measures 9.25" high x 11" wide x 3" deep.

Before ordering, confirm the number of zones (3) and that each circulator draws no more than 5 amps. Use the installation manual to plan thermostat and expansion wiring.