The Caleffi 656414 is a 24V thermoelectric actuator with an auxiliary microswitch. It opens and closes a radiator or zone valve on a thermostat signal, silently and at low current draw.
Best for zone control where motorized actuators would be audible or would overload the transformer.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Low Current Draw
A thermoelectric element opens and closes the valve on a 24V signal, drawing far less current than a motorized actuator and allowing more zones per transformer.
Silent Operation
No motor or gear train, so the actuator is silent in occupied spaces.
Auxiliary Microswitch
An integral end-switch confirms valve position, allowing pump or boiler interlock so the circulator only runs when a zone is calling.
Technical Specifications
| Product Type | Thermoelectric Actuator |
| Ambient temperature range | 0-50 deg C |
| Protection class | NEMA 3 (IP 54) |
| Supply cable length | 31.5 in (80 cm) |
| Supply voltage | 24 VAC or 24 VDC |
| Operation | Normally closed |
| Starting (in-rush) current | less than or equal to 250 mA |
| Holding current | 125 mA |
| Running power consumption | 3 W |
| Opening time (80%) | 300 s |
| Opening time (100%) | 600 s |
| Closing time | 240 s |
| Available stroke length | 4 mm |
| Auxiliary microswitch contact rating | 5 A at 24 V (Caleffi NA brochure 01198_NA) |
| Series | Accessories |
| Shipping Weight | 0.4 lb |
Documentation
Related Products
- Caleffi 656404 : Thermoelectric Actuator 24V
- Caleffi 200000 : Control Head, Built-in Sensor
- Caleffi 201000 : Control Head, Remote Sensor
- Caleffi 203502 : Control Head, Contact Probe
Frequently Asked Questions
What does Caleffi 656414 do?
It is a 24V thermoelectric actuator. It opens and closes a radiator or zone valve on a thermostat signal using a heated element rather than a motor, so it is silent and draws low current.
What is the auxiliary microswitch on Caleffi 656414 for?
The end-switch confirms the valve has opened, so the circulator or boiler can be interlocked to run only when a zone is actually calling for heat.
What is the warranty on Caleffi 656414?
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:
- Thermoelectric Actuator
- Product Family:
- Thermostatic control heads
- Series:
- Accessories
