The M9220-Xxx-3 Actuators Are Direct-Mount, Spring-Return Electric Actuators That Operate With These Available Power Options: Ac 24 V At 50/60 Hz Or Dc 24 V, (Agx, Bgx, Ggx, Hgx), Ac 120 V At 60 Hz (Bax) And Ac 230 V At 50/60 Hz (Bdx). These Bidirectional Actuators Do Not Require A Damper Linkage, And Are Easily Installed On Dampers With 1/2 To 3/4 In. Or 12 To 19 Mm Round Shafts, Or 3/8 And 1/2 In. Or 10, 12, And 14 Mm Square Shafts Using The Standard Shaft Clamp Included With The Actuator. An Optional M9220-600 Jackshaft Coupler Kit Is Available For 3/4 To 1-1/16 In. Or 19 To 27 Mm Round Shafts, Or 5/8 And 3/4 In. Or 16, 18, And 19 Mm Square Shafts. Made in United States. Manufactured by Johnson Controls.