Neptronic VM060-500 : Spring Return Linear Actuator, 24 VAC/DC, 27 lbf, 2-10VDC (4-20mA) Proportional Control Input, Feedback, 120 Second Run Time, 60 Second Return Time, NEMA 3R Enclosure (Additional shipping or handling charges may apply. Contact sales@energycontrol.com for a quote.)