The Belimo LMB24-10P-HM is a compact non-spring-return damper actuator delivering 45 in-lb [5 Nm] of torque with on/off (two-position) control on AC/DC 24 V power. It direct-couples to round or square damper shafts from 1/4 in. to 5/8 in. (up to 3/4 in. with an accessory clamp) and is non-fail-safe, with no spring return, making it a proven member of the LMB platform for small to mid-size commercial HVAC dampers. A built-in 10 kΩ feedback potentiometer reports damper position. It is a drop-in retrofit for legacy Belimo LM24-M and LM24-10P-M actuators.
Specifications sourced from the official Belimo LMB24-10P-HM technical data sheet (rev 2025-10-06).
Overview
Belimo LM-Series actuators are compact non-spring-return drives for small and mid-size commercial HVAC dampers — they position the damper under power and have no spring-return fail-safe function. The LMB24-10P-HM produces 45 in-lb [5 Nm] and mounts directly to round or square damper shafts from 1/4 in. to 5/8 in. (up to 3/4 in. with an accessory clamp). A built-in 10 kΩ potentiometer provides position feedback. Two-position on/off control positions the damper from a controller, relay or switch.
Best for
- Compact non-spring-return damper control where fail-safe return is not required
- Small to mid-size damper and louver positioning (45 in-lb)
- Direct shaft mount, 1/4-5/8 in. (to 3/4 in. with accessory clamp)
- Position feedback via built-in 10 kΩ potentiometer
- Drop-in retrofit of legacy LM24-M / LM24-10P-M
Key Features
Non-Spring-Return Design
No fail-safe spring return. Belimo does not publish a defined position on loss of power for this model; specify a spring-return actuator where a fail-safe position is required.
45 in-lb Torque
Sized for small and mid-size dampers; direct-couples to round or square damper shafts from 1/4 in. to 5/8 in. (up to 3/4 in. with an accessory clamp).
Two-Position On/Off Control
Accepts two-position on/off control from a controller, relay or switch.
Built-In 10 kΩ Potentiometer
An integrated 10 kΩ feedback potentiometer reports damper position back to the control system.
LM24-M Retrofit
A direct drop-in replacement for legacy Belimo LM24-M and LM24-10P-M actuators — matching mounting and wiring.
cULus Listed & Quiet
cULus listed, ISO 9001 built, UL 2043 plenum-rated for long, maintenance-free service.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Belimo |
| Part Number | LMB24-10P-HM |
| Actuator Type | Non-Spring-Return (Non Fail-Safe) Damper Actuator |
| Nominal Voltage | AC/DC 24 V |
| Nominal Frequency | 50/60 Hz |
| Power Consumption (Running) | 1.5 W |
| Transformer Sizing | 2 VA |
| Torque | 45 in-lb [5 Nm] |
| Control Signal | On/Off (two-position) — per the SKU summary specification; the reused Typical Specification paragraph in the same datasheet also mentions floating point. Confirm with Belimo before specifying 3-wire floating control |
| Built-In Feedback Potentiometer | 10 kΩ (position feedback) |
| Shaft Range | 1/4 in. to 5/8 in. (to 3/4 in. with accessory clamp) |
| Angle of Rotation | Max. 95° (adjustable mechanical stop) |
| Running Time (Motor) | 95 s / 90° |
| Running Time Note | constant, independent of load |
| Sound Power Level (Motor) | 35 dB(A) |
| Behavior on Power Loss | Non fail-safe — no fail-safe spring return function |
| Manual Override | External push button |
| Direction of Motion | Selectable with 0/1 switch |
| Electrical Connection | 18 AWG plenum cable, 3 ft [1 m], 1/2 in. NPT conduit connector |
| Overload Protection | Electronic, full 0-95° rotation |
| Power Source | UL Class 2 Supply |
| Enclosure Rating | NEMA 2 / UL Type 2 / IP20 |
| Ingress Protection Note | The IEC/EN device rating is IP20, while the electrical-connection specification on the same datasheet states NEMA 2 / IP54 for the cable and conduit connector. Confirm with Belimo for installations where ingress protection is critical |
| Ambient Temperature | -22 to 122°F [-30 to 50°C] |
| Agency Listing | cULus (UL60730-1A / -2-14, CAN/CSA) |
| Quality Standard | ISO 9001 |
| Plenum Rated | UL 2043 (suitable for air plenums) |
| Weight | 1.3 lb [0.58 kg] |
| Warranty | 5 Years |
Documentation
Related Products
Accessories & Mounting
Common Belimo accessories for mounting, linkage, signaling and powering the LMB24-10P-HM, drawn from the actuator datasheet. All are stocked by ZOT Supply as an authorized Belimo distributor.
Mounting & Linkage
Electrical Add-Ons
Enclosures & Weather Shields
Frequently Asked Questions
What is the Belimo LMB24-10P-HM?
The Belimo LMB24-10P-HM is a compact non-spring-return (non-fail-safe) damper actuator for commercial HVAC. It produces 45 in-lb [5 Nm] of torque, uses on/off (two-position) control on AC/DC 24 V power. It is non-fail-safe: Belimo does not publish a defined position on loss of power for this model. Its housing is rated NEMA 2.
Is the LMB24-10P-HM a spring-return (fail-safe) actuator?
No. The LMB24-10P-HM is non-spring-return: it has no fail-safe spring, so it will not drive to a predetermined position when power is lost. Where a defined position on power loss is required, select a spring-return actuator sized to the damper manufacturer's specifications.
What happens to the LMB24-10P-HM when power is lost?
There is no spring return, so the actuator does not drive itself to a fail-safe position. Belimo's datasheet for this model does not publish a defined power-loss position; if your sequence depends on a specific position during a power failure, specify a spring-return actuator.
What shaft sizes does the LMB24-10P-HM fit?
It direct-couples to round or square damper shafts from 1/4 in. to 5/8 in. (up to 3/4 in. with an accessory clamp) using its universal clamp.
What control signal does the LMB24-10P-HM use?
It uses two-position on/off control, driven from a controller, relay or switch. Belimo's summary specification for this model lists On/Off only; the reused Typical Specification paragraph in the same datasheet also mentions floating point, so confirm with Belimo before specifying 3-wire floating control.
What is the running time of the LMB24-10P-HM?
Motor running time is 95 s / 90°.
Does the LMB24-10P-HM provide position feedback?
Yes. It has a built-in 10 kΩ feedback potentiometer that reports the damper's position back to the control system.
What does -HM mean on the LMB24-10P-HM?
The -HM models are designed as drop-in retrofits for legacy Belimo LM24-M and LM24-10P-M actuators, matching their mounting and wiring so older units can be replaced directly.
Is the Belimo LMB24-10P-HM available from an authorized Belimo distributor?
Yes. ZOT Supply is an authorized Belimo distributor and carries the LMB24-10P-HM. Every unit ships factory new with Belimo's full 5-year warranty and application support.
- Actuator Type:
- Non-Fail-Safe
- Torque:
- 45 in-lb
- Control Signal:
- On/Off
- Voltage:
- 24 VAC/DC
- Auxiliary Switch:
- No
- Series:
- LM
- Feedback Potentiometer:
- 10 k
