Description
The Belimo AFRB24 is a spring return valve actuator designed for reliable on/off control of HVAC control valves. Operating on AC/DC 24 V, it provides dependable fail-safe positioning and consistent performance in hydronic control applications.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Valve Actuators |
| Part Number |
AFRB24 |
| Subcategory |
Spring Return Actuators |
| Actuator Type |
Spring return, on/off |
| Nominal Voltage |
AC/DC 24 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 19.2…28.8 V / DC 21.6…28.8 V |
| Power Consumption (Running) |
5 W |
| Power Consumption (Rest) |
2.5 W |
| Transformer Sizing |
7.5 VA |
| Control Type |
On/Off |
| Angle of Rotation |
90° |
| Running Time |
75 s / 90° |
| Fail-Safe Running Time |
<20 s |
| Electrical Connection |
18 AWG cable, 1 m, 1/2" NPT conduit |
| Degree of Protection |
NEMA 2 / UL Type 2 |
| Ambient Temperature |
-22…122°F (-30…50°C) |
| Weight |
5.3 lb (2.4 kg) |
Information About AFRB24
The AFRB24 is part of Belimo’s spring return actuator lineup developed for dependable valve actuation in HVAC systems. It uses a mechanical spring return mechanism to automatically drive the valve to a predefined safety position during power loss. The actuator supports simple on/off control and allows reversible mounting for both motor and fail-safe direction, providing installation flexibility. Designed for maintenance-free operation, it includes electronic overload protection and robust enclosure construction for long-term reliability.
Key Features
- Spring Return Fail-Safe Operation: Integrated spring mechanism automatically moves the valve to a safety position when power is lost, supporting system protection.
- On Off Control Functionality: Designed for straightforward open and close valve operation in hydronic control systems.
- Reversible Direction Of Motion: Motor and fail-safe rotation direction can be configured through CW or CCW mounting for flexible installation.
- Reliable 24 Volt Power Operation: Operates on standard AC/DC 24 V control power commonly used in HVAC systems.
- Manual Override Capability: Supplied 5 mm hex crank allows temporary manual valve positioning during commissioning or service.
- Electronic Overload Protection: Protects the actuator throughout the full 0…95° rotation range to prevent damage under abnormal conditions.
- Plenum Rated Construction: UL 2043 compliant design supports installation in air plenums per NEC and IMC requirements.
The AFRB24 delivers the reliability and precision required for safe, dependable on/off valve control in commercial HVAC applications.
