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GK Series (360 in-lb)
EFS, NEMA 4H, 360in-lb, On/Off/Float, 24V
Unit of Measure


Product Type

N/A Damper Actuator

Actuator Type

N/A Electronic Fail-Safe

Object name

N/A GKB24-3-T N4H



Application Type

N/A Air


N/A Electronic Fail-Safe


N/A minimum 360 in·lbminimum 40 N·m

Control Type

N/A On/Off, Floating Point

Control Input

N/A On/Off, Floating Point

Input Impedance

N/A 1000 Ω

Position Feedback

N/A No Feedback

Running Time (Motor)

N/A 150 seconds constant, independent of load

Running Time (Fail-Safe)

N/A 35 seconds

Power Supply

N/A 24 VAC ±20%, 50/60 Hz

Power Consumption

N/A running: 12 W, holding: 3.0 W, heater: 21 W

Transformer Sizing

N/A 21 VA (class 2 power source) / heater 21 VA

Electrical Connection

N/A screw terminal (for 26 to 14 GA wire), 1/2" conduit connector

Overload Protection

N/A Electronic throughout 0º to 95º rotation

Shaft Diameter

N/A Standard: 1/2" to 1.05" round, centers on 3/4" with insert, 1.05 without insert

Angle of Rotation

N/A max. 95º, adjustable with mechanical stop

Direction of Rotation (Motor)

N/A reversible with switch

Direction of Rotation (Fail-Safe)

N/A Reversible with switch

Position Indication

N/A Reflective visual indicator (snap on)

Manual Override

N/A External push button


N/A 100% condensing

Ambient Temperature

N/A -40 to +122 ºF-40 to +50 ºC

Ambient Temperature (safety)

N/A -40 to 122 ºF-40 to 50 ºC

Storage Temperature

N/A -40 to +176 ºF-40 to +80 ºC

Noise Level

N/A max. 45 dB (A)


N/A NEMA 4, IP66, UL Enclosure type 4

Agency Listing

N/A cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EEC and 2006/95/EC


N/A Maintenance Free

Quality Standards

N/A ISO 9001


N/A 9.1 lb4.30 kg


N/A For on/off and floating point control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer's specifications.
The actuator is mounted directly to a damper shaft up to 1.05" in diameter by a universal clamp, self-centered default.