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The SF Series actuator requires a 24 Vac, 120 Vac, 208 Vac, or 277 Vac Class-2 supply signal to control Siemens Zone Valves with a 1/10-inch (2.5 mm) stroke. 

For use in heating and cooling HVAC applications with Siemens 599 Series Zone Valves that need 24 lb (105N) nominal force. 

Features:

• UL listed for plenum installations
• Direct coupled installation without tools
• Manual override
• Visual position indication
• Spring return fail safe operation