KH-LF | Belimo | Actuators & Dampers

LF crankarm (with 1/2 diameter shaft pass through).




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Availability: 5 In Stock
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product specifications

Actuator Series

Mechanical Accessory

Application Type



Crank Arm

Unit of Measure


product series specifications

    Input Impedance:
  • -SR Models 100 k‚Ѷ @ 0/2-10 VDC; 500‚Ѷ @ 4-20 mA
  • -MFT Models 100 k‚Ѷ @ 0/2-10 VDC; 500‚Ѷ @ 4-20 mA; 1500‚Ѷ @ PWM, float, on/off
  • Brushless DC
    Manual Override:
  • Manual crank (except TF)
  • TFB,LF 3' (0.9 m) cable, 18 AWG, plenum rated (modulating models)
  • 3' (0.9 m) appliance cable (on/off, MFT, -S models)
  • NFB, AFB, EFB 3' (0.9 m) appliance cable, 18 AWG
  • NEMA 4 Terminal blocks inside housing
    Conduit Connection:
  • w/Cables 1/2‚Ä= NPT
  • NEMA 4 Four knockouts for waterproof conduit fittings
  • 2-10 VDC (-SR and -MFT models only)
    Auxiliary Switch:
  • TFB, LF (-S) 1 SPDT, 3A @ 250V
  • NFB, AFB, EFB (-S) 2 SPDT, 3A @ 250V
  • 2-Position CW/CCW reversible mounting
  • Float/Prop. DA/RA switch, CW/CCW rev. mt.
    Spring Return Time:
  • <60 seconds
  • 95°
  • TFB, LF, NFB <62 db
  • AFB <45 db
  • EFB <71.4 db
  • 100 steps
    Life Expectancy:
  • 2-Position 60,000 cycles
  • Float/Prop. 60,000 cycles; 500,000 repositions
    Operating Temperature:
  • -22° to 122°F (-30° to 50°C); NEMA 4 models with heater option can go down to -40‚Ñâ (-40‚ÑÉ)
    Operating Humidity:
  • 5 to 95% RH
    Enclosure Rating:
  • TFB NEMA 2 (IP42)
  • LF, NFB, AFB, EFB NEMA 2 (IP54)
  • NEMA 4 NEMA 4 (IP66)
  • cULus, CE, RoHS
  • 5 years

product series features

  • Symmetrical, reversible rotation design for installation flexibility
  • ISO 9001 manufacturing facility assures high quality
  • NEMA 4 Enclosure Rating for outdoor locations available on AFB, EFB and NFB models
  • Low power consumption for high efficiency and smaller transformer sizing
  • MFT models offer flexibility to customize and adapt a single actuator to various controllers and applications

more information & related documents

Series Description

The Belimo TFB, Belimo LF, Belimo NFB, Belimo AFB, and Belimo EFB Series direct-coupled air damper actuators provide control of dampers and valves for spring return applications. The damper actuators come in two-position, tri-state, proportional, and Multi-Function Technology (MFT) models. All include spring return to drive the damper or valve to a normal position when power is lost. Unique universal power supply models work with 24 Volt AC to 240 Volt AC or 24 Volt DC to 125 Volt DC. The new EFB Series is true spring return with a high 270 in-lb torque output and most models are available with optional NEMA 4 housing. It is possible to dual-mount EF actuators on one shaft, for a total of 540 in-lb. This actuator series is indispensable for Building Automation System BAS and HVAC applications.

Kele Description