Belimo SM24A-S Damper Actuator (20Nm, 24V, On/Off & 3-Point, Aux Switch)

Immediately available

Belimo SM24A-S Damper Actuator (20Nm, 24V, On/Off & 3-Point, Aux Switch)

Immediately available

Brand: Belimo

Product type: Damper Actuator

Operating Voltage: 24 VAC/DC

Force / Torque: 20 Nm

Control Signal: 2 Position3 Position

Belimo SM24A-S damper actuator for HVAC air dampers up to approx. 4 m²; AC/DC 24 V, open/close + 3-point, 20 Nm, IP54 / NEMA 2, 150 s/90°, with integrated adjustable auxiliary switch (1x SPDT, 0–100%) and lockable manual override.

Product information "Belimo SM24A-S Damper Actuator (20Nm, 24V, On/Off & 3-Point, Aux Switch)"

The Belimo SM24A-S is a robust rotary actuator designed to adjust HVAC air dampers in technical building installations. It supports standard open/close and 3-point (floating) control wiring and includes an integrated adjustable auxiliary switch for damper end-position signalling, fan interlocks, and status feedback to BMS/DDC panels

It is built for simple direct mounting on the damper shaft with a universal reversible shaft clamp and supplied anti-rotation mechanism. The actuator is overload protected, requires no limit switches, and automatically stops at the end stop. A lockable push-button manual override supports commissioning and maintenance.

Applications

AHU fresh/return/exhaust air dampers
Large dampers up to approx. 4 m² requiring 20 Nm torque
Fan enable interlock (damper proof) using the adjustable aux switch
BMS/DDC panels using 3-point floating sequences for damper positioning

Technical data

Specification	Value
Model	SM24A-S
Damper size	Up to approx. 4 m²
Supply	AC/DC 24 V, 50/60 Hz
Voltage range	AC 19.2–28.8 V / DC 19.2–28.8 V
Control	Open/Close, 3-Point
Torque	20 Nm
Running time	150 s / 90°
Rotation angle	Max 95° (adjustable end stops)
Direction	Selectable (switch 0 = ccw / 1 = cw)
Manual override	Push-button, lockable
Auxiliary switch	1x SPDT, adjustable 0–100%
Aux switch rating	1 mA–3 A (0.5 A inductive), DC 5 V–AC 250 V
Power (operation / rest)	2 W / 0.2 W
Wire sizing	4 VA
Supply/control cable	1 m, 3 × 0.75 mm²
Aux switch cable	1 m, 3 × 0.75 mm²
Protection	IP54; NEMA 2; UL Type 2
Safety	SELV (Protection Class III); UL Class 2 supply
Sound level	45 dB(A)
Shaft clamp	Universal reversible 10…20 mm
Ambient	-30…50°C; max 95% RH non-condensing
Storage	-40…80°C
Weight	1.0 kg
Hygiene	VDI 6022 Part 1 / SWKI VA 104-01
Approvals	CE (EMC & LVD); cULus (UL60730)