User Guide
F-27599-4       Copyright 2011 Schneider Electric All Rights Reserved.   1
M400A (VB), M800A (VB), M1500A (VB) 
Schneider Electric Non-Spring Return 
Forta Globe Valve 
Actuators and Assemblies
General Instructions
APPLICABLE LITERATURE
Forta/VB-7xxx Selection Guide, F-27490• 
Forta/VB-8xxx, VB-9xxx Selection Guide, F-27491• 
AV-800 Series Linkage Adapters for Competitors Valves, F-27470• 
AV-821 Linkage VB-7xxx, F-27701- U-Bolt Style Only• 
AV-822 Linkage VB-8xxx, VB-9xxx, F-27702 U-Bolt Style Only• 
APPLICATION
Forta M400A (VB) / M800A (VB) /M1500A (VB) series Non-Spring Re-
turn linear actuators are available in two styles, U-Bolt Mount style, 
mounts to Schneider Electric globe valves with AV-821 linkage kits 
for mounting to VB-7xxx valves or AV-822 for mounting to VB-8xxx, 
or VB-9313-0-5-xx valves. Screw Mount style, screws directly to the 
bonnet nut on VB-7xxx valves (no adapter required). 
Applications include chilled or hot water and steam. Field select-
able input signals include reverse and direct acting, Floating or 
Proportional 0-10, 2- 10 vdc or 4-20 ma with 500 ohm resistor 
(supplied) plus proportional sequencing input signal ranges.
 FEATURES
Two Mounting Styles, U-Bolt Mx00A or Screw Mx00A-VB • 
Floating con guration controlled by a SPDT  oating controllers• 
Proportional con guration 0-10, 2-10 vdc or 4-20 mA with the • 
addition of a 500 ohm resistor included
Direct/Reverse action switch selectable• 
90 lbf (400N) linear force• 
180 lbf (800N) linear force• 
337 lbf (1500N) linear force• 
24 Vac •  or 24 Vdc Powered
Die-cast housing with plenum rated plastic cover for NEMA 2 • 
(IP54 vertical mount only) applications
Manual override to allow positioning of valve• 
Electronic valve sequencing and Electronic  ow curve (equal • 
percentage or Linear) selection.
Torque overload protection throughout stroke• 
Easy “One Touch” input signal/stroke calibration• 
Screw Mount Style Forta (Left) and U-Bolt Style Forta (Right)
SPECIFICATIONS
U-bolt Style M400A M400A-S2 M800A M800A-S2 M1500A M1500A-S2
Screw Mount Style M400A-VB M400A-S2-VB M800A-VB M800A-S2-VB M1500A-VB M1500A-S2-VB
AC Power
24 Vac +- 10% 50-60 Hz
DC Power
20 - 29 Vdc 20 W 20 - 29 Vdc 30 W
Running VA
6
15
24
Transformer Size VA
30
50
50
Floating Control
Yes
Proportional Control
0 to 10 Vdc, 2 to 10 Vdc or 4 to 20mA with 500 ohm resistor
Feedback
2 to 10 Vdc
Force
90 lbf (400 N)
180 lbf (800 N)
337 lbf (1500 N)










