The Belimo UMB24Y-SR-L is a compact non-spring-return rotary damper actuator delivering 9 in-lb [1 Nm] of torque with modulating 2-10 VDC control on AC/DC 24 V power. As one of Belimo's smallest rotary actuators, it drives small dampers through counter-clockwise (CCW) rotation and mounts with a universal clamp for round shafts 1/4-1/2 in.. It holds its last position on power loss (non-fail-safe) and connects through a locking Molex plug (IP20). This listing is a factory multipack of 100 units (100 pcs.) of the UMB24Y-SR-L — sized for OEM and high-volume jobs.
Specifications sourced from the official Belimo UMB24Y-SR-L technical data sheet (rev 2025-10-06).
Overview
Belimo UM-Series actuators are Belimo's smallest non-spring-return rotary drives, for small commercial HVAC dampers and zone control. The UMB24Y-SR-L produces 9 in-lb [1 Nm] and rotates counter-clockwise (CCW) (a separate model covers the opposite direction). It mounts directly on a round damper shaft from 6 to 12.7 mm with its universal clamp. It holds the last commanded position when power is removed (there is no spring-return fail-safe), and connects via a locking Molex plug — the cable-side socket is not included, so order the matching Z-C24UM-SR connecting cable. A 2-10 VDC signal modulates the damper with 2-10 VDC position feedback. This product is sold as a factory multipack of 100 units (100 pcs.).
Best for
- Modulating small-damper control (2-10 VDC, 9 in-lb)
- Non-spring-return applications (no fail-safe required)
- Tight spaces needing a very compact rotary actuator
- Round damper shafts 1/4-1/2 in.
- Counter-clockwise (ccw) damper rotation
Key Features
Ultra-Compact 9 in-lb
One of Belimo's smallest rotary actuators — drives small dampers where space is tight, weighing under 6 oz.
Non-Spring-Return Design
Holds the last commanded position when power is removed (non-fail-safe), with a fast 22-second running time.
Modulating 2-10 VDC
Accepts a 2-10 VDC control signal with 2-10 VDC position feedback for proportional damper control.
CCW Rotation
Factory-set counter-clockwise (CCW) rotation. Choose the -R (CW) model for the opposite direction.
Universal Shaft Clamp
Mounts directly on round damper shafts from 1/4 in. to 1/2 in. with an anti-rotation clip.
Plug-In Molex Connection
A locking Molex plug speeds installation and allows parallel wiring. Order the Z-C24UM-SR cable (socket not included).
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Belimo |
| Part Number | UMB24Y-SR-L |
| Actuator Type | Non-Spring-Return (Non Fail-Safe) Rotary Damper Actuator |
| Nominal Voltage | AC/DC 24 V |
| Nominal Frequency | 50/60 Hz |
| Torque | 9 in-lb [1 Nm] (minimum) |
| Control Signal | Modulating |
| Operating Range (Y) | 2-10 VDC (also 0.5-10 V / variable) |
| Position Feedback (U) | 2-10 VDC (max. 0.5 mA) |
| Mechanical Interface | Universal clamp (1/4-1/2 in.) (round shaft 6-12.7 mm) |
| Angle of Rotation | 95° (adjustable end stops) |
| Direction of Rotation | counter-clockwise (CCW) — factory-set by model (L=CCW, R=CW) |
| Running Time (Motor) | 22 s / 90° (constant) |
| Behavior on Power Loss | Holds last position (non-spring-return) |
| Manual Override | None (gear-disengagement magnet Z-MA available) |
| Electrical Connection | Molex connector plug (locking) — cable-side socket NOT included; order Z-C24UM-SR cable |
| Electrical Protection | Double insulated (Class 2) |
| Enclosure Rating | IP20 / NEMA 1 (indoor) |
| Ambient Temperature | -22 to 122°F [-30 to 50°C] |
| Agency Listing | cULus (UL60730), CE |
| Quality Standard | ISO 9001 |
| Weight | 0.35 lb [0.16 kg] |
| Warranty | 5 Years |
Documentation
Related Products
Accessories & Cabling
The UMB24Y-SR-L connects through a Molex plug, so the matching connecting cable is required (the cable-side socket is not included). All UM accessories below are stocked by ZOT Supply as an authorized Belimo distributor.
Frequently Asked Questions
What is the Belimo UMB24Y-SR-L?
The Belimo UMB24Y-SR-L is a compact non-spring-return (non-fail-safe) rotary damper actuator for small commercial HVAC dampers. It produces 9 in-lb [1 Nm] of torque, uses modulating 2-10 VDC control on AC/DC 24 V power, rotates counter-clockwise (CCW), and holds its last position on power loss.
How many actuators are in this UMB24Y-SR-L pack?
This listing is a factory multipack containing 100 units (100 pcs.) of the Belimo UMB24Y-SR-L actuator. Pricing is for the full 100-unit pack — sized for OEM and high-volume projects.
Does the UMB24Y-SR-L need a separate cable?
Yes. The UMB24Y-SR-L terminates in a locking Molex plug and the cable-side socket is not included. Order the Z-C24UM-SR connecting cable (sold separately) to wire the actuator.
What do the -L and -R suffixes mean?
They set the factory direction of rotation: -L rotates counter-clockwise (CCW) and -R rotates clockwise (CW). The UMB24Y-SR-L is a CCW model; choose the opposite-suffix part for the other direction.
What shaft does the UMB24Y-SR-L fit?
It mounts on round damper shafts from 6 to 12.7 mm (about 1/4 to 1/2 in.) using its universal clamp and anti-rotation clip. For square 8x8 mm shafts, choose the -F (form-fit) model.
Is the UMB24Y-SR-L spring-return?
No. The UMB24Y-SR-L is non-spring-return: on power loss it holds its last position rather than driving to a fail-safe position. It has no manual override, though the Z-MA gear-disengagement magnet allows manual positioning.
Is the Belimo UMB24Y-SR-L available from an authorized Belimo distributor?
Yes. ZOT Supply is an authorized Belimo distributor and carries the UMB24Y-SR-L. Every unit ships factory new with Belimo's full 5-year warranty and application support.
- Actuator Type:
- Non-Spring-Return (Rotary)
- Torque:
- 9 in-lb
- Control Signal:
- Modulating
- Voltage:
- 24 VAC/DC
- Rotation:
- CCW (Left)
- Shaft Coupling:
- Universal Clamp
- Connection:
- Molex Plug
- Feedback Signal:
- 2-10 VDC
- Pack Quantity:
- 100 pcs
