SPECIFICATIONS
Actuator Inputs
Connections: Coded screw terminals.
Control Circuit: Two-wire.
Power Input: See Table-1.
Actuator Outputs
Torque: See Table-1.
Shaft Rotation:
MA-305, MA-405, MA6-305, MA6-405, CW 180° when power is applied.
MA-318, MA-41x, MAx-318, MAx-41x, CW 180° when power is applied.
Spring Return: CCW to the original position when the actuator is de-energized.
Auxiliary Switch (-500 Models): SPDT makes (or breaks) the circuit at the powered end of
stroke.
Environment
Ambient Temperature Limits:
Shipping & Storage, -40 to 136 °F (-40 to 58 °C).
Operating, -40 to 136 °F (-40 to 58 °C).
Humidity: 5 to 95% RH, non-condensing.
Location: NEMA Type 4 when used with the gasket (provided) and water-tight conduit
connectors (not provided), optional hazardous location models.
Agency Listings:
US Standard UL 873, Underwriters Laboratories (File #E9429 XAPX, Temperature
Indicating and Regulating Equipment).
Candadian Standard C22.2 No. 24: Underwriters Laboratories (File #E429 Category
XAPX7, Temperature Indicating and Regulating Equipment).
Hazardous Location Models, UL file #E29291. Designed for use in hazardous locations
N.E.C., Class 1, Groups C and D, and Class 2, Groups E, F, and G. Temperature code T6 for
hazardous housing.
Table-1 Model Chart.
Part Number
Power
Supply Auxiliary
Switch
a
Input
Watts
VA Rated
Torque
lb-in. (N-m)
No Load
Timing in
Seconds at
75 °F (24 °C)
b
Mounting Application
Vac Hz Running Holding
MA-305
24
60
No
25
56 56
16 (1.8)
20
Any Position
(Horizontal
Output Shaft
Position
Preferred)
Damper
Actuators
MA-305-500 Yes
MA-405
120
No
48 48
MA-405-500 Yes
MA-318
24
No
70
Running
25
Holding
92 32
60 (6.8)
Output Shaft
Must Be
Horizontal
Damper
and Valve
Actuators
MA-318-500 Yes
MA-416
208
60
No
104 38
MA-416-500 Yes
MA-418
120
No
108 42
MA-418-500 Yes
MA-419
240
No
120 39
MA-419-500 Yes
MA5-419
50
No
MA5-419-500 Yes
a 4.4 FLA, 26.4 LRA @ 24 or 120 Vac; 2.4 FLA, 13.2 LRA @ 240 Vac.
b Spring return timing with full load opposing spring is approximately 60 sec.
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