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Honeywell - ML6421A1017 - AG - Dca; Nsr; 95 Sec Timing; 3/4In Stro

 Direct-coupled, linear-stroke Valve Actuator with 405 lbf rated force 24 volt



Honeywell ML6421A, B non-spring return electic linear valve actuators are used with low-voltage, single-pole, double-throw (SPDT), Series 60 two-position and floating controlling. They operatre standard Honeywell valves in HVAC applications.



  • Quick, easy installation on valves with 1 3/8-in. bonnet and 3/4-in. stroke, or with 1 7/8-in. bonnet and 1 1/2-in. stroke
  • No required separate linkage and no adjustments required on linkage
  • High force for VGF pressure-balanced valves
  • Standard conduit connector
  • Accurate valve positioning
  • Low power consumption and high close-off ratings
  • Force limiting end switches
  • Synchronous motor


Customer Rating: Not Rated Yet
Quick Order Number: 510
Manufacturer: Honeywell
Part Number: ML6421A1017
Weight: 7.00 lbs
Stocked Item*: Yes
Quantity Available*: 5
Price: $412.59

* If an order is placed where the item is a "Non-Stocked Item" or the quantity ordered is more than the quantity available, all items in stock will be shipped and the remainder of the items will be shipped as soon as we get the "backordered" items in.


Product Specifications


Product Specifications

Dimensions (in.)
10 3/8 in. high x 7 in. wide x 7 in. deep
Dimensions (mm)
264 mm high x 178 mm wide x 178 mm deep
1/2 in. conduit hub; 1/2 in. flexible conduit adapter
Weight (lb)
5.1 lb
Weight (kg)
2.3 kg
ABS Plastic
Directly on V5011/V5013 Globe Valves and VGF Flanged Globe Valves
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
Flammability Rating UL94V-5V
Approvals, Canadian Standards Association
Electrical Connections
Screw terminals
Operating Humidity Range (% RH)
5 to 95% RH
Supply Voltage
24 Vac +10%, -30%
Power Consumption
Driving-- 11 VA
Shipping and Storage Temperature Range (F)
-40 F to +158 F
Shipping and Storage Temperature Range (C)
-40 C to +70 C
Approvals, CE
Ambient Temperature Range (F)
14 F to 122 F
Ambient Temperature Range (C)
-10 C to +50 C
Environmental, Electrical or Ingress Protection Rating
IP54,Class I Insulation (24 Vac)
Internal Auxiliary Switch
Fluid Temperature (C)
150 C Maximum
Fluid Temperature (F)
300 F Maximum
Actuator Type
Control Signal
SPDT; Two position; Floating
Fail Safe Mode
Stays in place
Torque Rating (lb-in.)
405 lbf
Torque Rating (Nm)
1800 N
Stroke (in.)
3/4 in.
Stroke (mm)
20 mm
Two knockout holes for 1/2 in. conduit standard on actuator case
Timing, Nominal
Driving @ 60 Hz-- 95 sec
Manual operation


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