TF-120: Belimo Spring Return 120V

Submittal Form
SKU: Belimo TF-120 Category:


For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is On/Off from an auxiliary contact, or a manual switch. The actuator is mounted directly to a damper shaft from 1/4” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.

The TF series actuators provide true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The TF series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 90°. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. The actuator is double insulated so an electrical ground connection is not necessary. The TF120-S US versions are provided with 1 built-in auxiliary switch. This SPDT switch is provided for safety interfacing or signaling, for example, for fan startup. The switching function is adjustable between 0° and 95°.

Additional information

Power Supply (Nominal)

100 to 240 VAC, 50/60 Hz

Power Supply (Tolerance)

85 to 265 VAC, 50/60 Hz

Power Consumption (Running)

2.5 W

Power Consumption (Holding)

1.3 W

Transformer Sizing

5 VA (Class 2 Power Source)

Electrical Connection (-S Models Have 2 Cables)

3 ft, 18 ga. Appliance Cable
1/2" Conduit Connector

Overload Protection

Electronic Throughout 0 to 95° Rotation

Electrical Protection

Actuators are Double Insulated

Angle of Rotation

Max 95°, Adjust. with Mechanical Stop


min. 18 in-lb [2 Nm]

Direction of Rotation

Reversible with CW/CCW Mounting

Position Indication

Visual Indicator 0° to 95° (0° Spring Return Position)

Running Time (Motor)

< 75 sec (0 to 18 in-lb)

Running Time (Spring)

< 25 sec @-4°F to 122°F [-20°C to 50°C]
< 60 sec @-22°F [-30°C]


5 to 95% RH non-condensing

Ambient Temperature

-22°F to 122°F [-30°C to 50°C]

Storage Temperature

-40°F to 176°F [-40°C to 80°C]


NEMA type 2 / IP42, UL enclosure type 2

Housing Material


Angency Listings†

cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC (and 2006/95/EC for -S versions)

Noise Level (MAX) (RUNNING)

< 50 db (A)


62 dB (A)


Maintenance Free

Quality Standard

ISO 9001

Weight (TF120)

1.4 lbs (0.6 kg)

Weight (TF120-S)

1.5 lbs (0.7 kg)

Auxilary Switch

Auxiliary switch 1 x SPDT 3A (0.5A) @ 250 VAC, UL Approved
Adjustable 0° to 95°