Description
The Belimo ZONE120NC-S is a spring-return zone actuator engineered for dependable, energy-efficient HVAC zoning in residential and light commercial applications. Designed to operate at 120Vac, this normally closed actuator automatically returns to the closed position upon power loss, ensuring fail-safe system protection and preventing unintended airflow or fluid flow when the zone is not calling for conditioning.
Key Features
- Spring-return, fail-safe operation — returns to normally closed position on power loss
- 120Vac operating voltage for compatibility with standard zone control systems
- Integrated auxiliary switch provides end-of-travel feedback for system interlock and control verification
- Compact, direct-coupled design for fast, tool-free installation on standard zone damper shafts
- Quiet, low-power operation minimizes energy consumption
- Durable construction built to withstand demanding HVAC duty cycles
- Suitable for use with zone control panels, thermostats, and building automation systems
Auxiliary Switch
The built-in auxiliary switch signals end-of-travel position to the zone control panel or air handler, enabling proven system interlock strategies such as fan proving and equipment lockout. This feature helps coordinate equipment operation with zone demand, improving system efficiency and comfort.
Spring-Return / Normally Closed Operation
The normally closed, spring-return design ensures the zone damper or valve defaults to the closed position whenever power is removed — whether intentionally during off cycles or due to a power interruption. This fail-safe behavior protects the HVAC system and maintains zone isolation without requiring continuous power.
Typical Applications
- Residential and light commercial HVAC zoning systems
- Forced-air zone damper control
- Hydronic zone valve actuation
- Fan coil unit control
- Building automation and energy management systems
Specifications
- Brand: Belimo
- Model / SKU: ZONE120NC-S
- Operating Voltage: 120Vac
- Actuator Type: Spring-Return
- Fail-Safe Position: Normally Closed (NC)
- Auxiliary Switch: Included







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