Product Overview

M9208-xxx-x Series Electric Spring Return Actuators Product Bulletin 13
M9208-Bxx-3 Series On/Off Electric Spring Return Actuators (Part 1 of 2)
Power
Requirements
-BGx Models AC 24 V (AC 18 V to 30 V) at 50/60 Hz: Class 2 (North America) or Safety
Extra-Low Voltage (SELV) (Europe), 6.1 VA Running, 1.2 VA Holding Position
DC 24 V (DC 21.6 V to 28.8 V): Class 2 (North America) or SELV (Europe),
3.5 W Running, 0.5 W Holding Position
Minimum Transformer Size: 7 VA per Actuator
-BAx Models AC 120 V (AC 102 V to 132 V) at 60 Hz: 0.05 A Running,
0.03 A Holding Position
-BDx Models AC 230 V (AC 198 V to 264 V) at 50/60 Hz: 0.04 A Running,
0.03 A Holding Position
Auxiliary Switch
Rating
-xxC Models Two Single-Pole, Double-Throw (SPDT), Double-Insulated Switches with
Gold over Silver Contacts:
AC 24 V, 50 VA Pilot Duty
AC 120 V, 5.8 A Resistive, 1/4 hp, 275 VA Pilot Duty
AC 240 V, 5.0 A Resistive, 1/4 hp, 275 VA Pilot Duty
Spring Return Direction Is Selectable with Mounting Position of Actuator:
Actuator Side A Is Away from Damper or Valve: CCW Spring Return
Actuator Side B Is Away from Damper or Valve: CW Spring Return
Rated Torque Power On
(Running)
70 lb·in. (8 N·m) All Operating Temperatures
Power Off
(Spring Returning)
70 lb·in. (8 N·m) at Standard Operating Temperatures
53 lb·in. (6 N·m) at Extended Operating Temperatures
Rotation Range Maximum Full Stroke: 95°
Adjustable Stop: 35 to 95°, Maximum Position
Rotation Time
for 90 Degrees of
Travel
Power On
(Running)
55 to 71 Seconds for 0 to 70 lb·in. (8 N·m) Load, at All Operating Conditions
60 Seconds Nominal at Full Rated Load (0.25 rpm)
Power Off
(Spring Returning)
13 to 26 Seconds for 0 to 70 lb·in. (8 N·m) Load, at Room Temperature
21 Seconds Nominal at Full Rated Load
39 Seconds Maximum with 70 lb·in. (8 N·m) Load at -4°F (-20°C)
108 Seconds Maximum with 53 lb·in. (6 N·m) Load at -40°F (-40°C)
Life Cycles 60,000 Full-Stroke Cycles with 70 lb·in. (8 N·m) Load
Audible Noise
Rating
Power On
(Running)
<47 dBA at 70 lb·in. (8 N·m) Load, at a Distance of 39-13/32 in. (1 m)
Power On
(Holding)
<20 dBA at a Distance of 39-13/32 in. (1 m)
Power Off
(Spring Returning)
<52 dBA at 70 lb·in. (8 N·m) Load, at a Distance of 39-13/32 in. (1 m)
Electrical
Connections
Actuator
(All Models)
48 in. (1.2 m) UL 758 Type AWM Halogen-Free Cable with 18 AWG
(0.85 mm²) Conductors and .25 in. (6 mm) Ferrule Ends
Auxiliary Switches
(-xxC Models)
48 in. (1.2 m) UL 758 Type AWM Halogen-Free Cable with 18 AWG
(0.85 mm²) Conductors and .25 in. (6 mm) Ferrule Ends
Conduit Connections Integral Connectors for 3/8 in. (10 mm) Flexible Metal Conduit
Mechanical
Connections
Round Shafts Range of Sizes: 5/16 to 5/8 in. (8 to 16 mm)
Square Shafts Range of Sizes: 1/4 to 1/2 in. (6 to 12 mm)
Enclosure Rating NEMA 2 (IP54) for All Mounting Orientations
Ambient
Conditions
Standard Operating -4 to 140°F (-20 to 60°C); 90% RH Maximum, Noncondensing
Extended Operating -40 to -4°F (-40 to -20°C); 90% RH Maximum, Noncondensing
Storage -40 to 185°F (-40 to 85°C); 95% RH Maximum, Noncondensing
Dimensions 6.33 x 3.90 x 2.26 in. (160.7 x 99 x 57.5 mm)