The Caleffi 626600A is a Uni-Switch universal flow switch with 1" NPT connections.
Best for proving circulation before a burner or appliance is allowed to fire, and for interlocking pumps, compressors and motorized valves in heating, air-conditioning, refrigeration and water treatment systems.
Specifications sourced from Caleffi technical brochure 01052/23 NA. Verified 5 August 2026.
Key Features
Universal Paddle Configuration
Supplied with interchangeable paddles that adapt the switch to a range of pipe sizes from one part number.
Positive Flow Proving
The microswitch provides a dry contact for boiler, chiller or pump interlock, proving flow before the appliance is allowed to fire.
Technical Specifications
| Product Type | Universal Flow Switch |
| Connection Size | 1" |
| Connection Type | NPT |
| Series | Uni-Switch |
| Maximum operating pressure | 150 psi |
| Medium temperature range | -20-250 deg F |
| Minimum flow rate | 5.7 gpm |
| Shipping Weight | 2.3 lb |
Documentation
Frequently Asked Questions
What is Caleffi 626600A used for?
It is a universal paddle flow switch providing a dry contact for boiler, chiller or pump interlock. It proves that flow is established before the appliance is permitted to fire.
What connection does Caleffi 626600A use?
It is supplied with 1" NPT connections. Other sizes and connection styles in the Uni-Switch range are listed under Related Products.
What are the pressure and temperature limits of Caleffi 626600A?
Maximum operating pressure is 150 psi.
What is the warranty on Caleffi 626600A?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Type:
- Universal Flow Switch
- Series:
- Uni-Switch
- Product Family:
- Universal Flow Switch
- Connection Type:
- NPT
- Connection Size:
- 1 inch
- Max Operating Pressure:
- 150 psi
