The Siemens 3VA9467-0HA20 is a motorized operating mechanism (MO) from the SENTRON accessory line, designed to remotely open and close 3VA1 and 3VA2 molded-case circuit breakers in the 400 A and 630 A frame sizes. It accepts a dual-rated control supply of 110–230 V AC (at 60 Hz) or 110–250 V DC, drawing 250 VA apparent power during operation. Make time is 1.7 s typical, break time 1.3 s typical — fast enough for emergency switching but not for arc-flash mitigation duty (that requires a dedicated shunt trip or undervoltage release). This is a panel-mount accessory that bolts onto the breaker front; the 149 mm depth, 138 mm width, and 92 mm height mean it adds roughly the footprint of a second breaker to the enclosure depth. Plan the gland plate and wireway accordingly — the control wiring enters at the mechanism, not the breaker terminals.
Control supply and environmental limits
The control supply voltage range is wide — 110 V minimum to 230 V maximum at AC 60 Hz, and 110 V minimum to 250 V maximum at DC — so it works across standard North American and European control voltages without a separate transformer tap. The operating temperature span of -40 °C to 80 °C covers most indoor and outdoor enclosures; the -40 °C floor matters for cold-climate installations where a standard mechanism might stiffen or fail to engage. Stripped length for the control wires is 7 mm — a common dimension for spring-cage or screw terminals on the mechanism block. The 250 VA apparent power draw is the peak during the make/break stroke; steady-state holding current is lower, but the control transformer must be sized for the inrush.