The Siemens 3VA9267-0HC35 is a SENTRON motorized operating mechanism with stored energy mechanism (SEO) designed as an accessory for 3VA2 molded case circuit breakers in the 100 A, 160 A, and 250 A frame sizes. It provides remote electrical switching capability — open and close commands — for breakers mounted in switchgear or panelboards where manual lever operation isn't practical or safe.
Control supply and operating characteristics
The mechanism accepts a wide control supply range: 110 V to 240 V AC at 60 Hz, and 110 V to 250 V DC. At 300 VA apparent power draw, it's sized for standard control transformer secondaries in industrial panels — verify the transformer VA rating can support the inrush during charging of the stored-energy spring. Make time and break time are both rated at 0.08 s typical, which means the mechanism closes or opens the breaker contacts in under one line cycle at 60 Hz. That consistent timing matters for coordination studies where breaker closing time affects arc-flash incident energy calculations.
Mounting dimensions and environmental limits
The unit measures 162.8 mm deep by 105 mm wide by 118.7 mm high. That depth is the critical dimension for enclosure selection — it must clear the back-of-panel wiring space plus the mechanism travel when the breaker is racked or bolted in. The 105 mm width matches the 3VA2 breaker profile, so it mounts directly on the breaker face without increasing the pole spacing. Stripped length for the control wiring terminations is 7 mm per the spec.