What this 3VA1 switch disconnector is — and isn't
The Siemens 3VA1225-1AA42-0HA0 is a SENTRON 3VA1 switch disconnector in an MCCB (molded case circuit breaker) physical design, but it is not a circuit breaker. It carries 250 A rated continuous current (Iu) across 4 poles, with no overload or short-circuit protection built in — that is the key distinction from a standard 3VA1 MCCB variant. It is sized for the IEC frame 250 footprint and terminates via busbar connection on the front terminals. The built-in shunt trip release (STL) operates on 12–30 V DC or 24 V AC 50/60 Hz, letting you remotely trip the switch from a control signal. No undervoltage release is fitted, and there are no auxiliary contacts onboard. Rated insulation voltage is 800 V, with a maximum AC operational voltage of 690 V at 50/60 Hz and DC operational voltage up to 600 V.
At 70 mm deep, 140 mm wide, and 158 mm tall, this 4-pole unit is wider than the 3-pole 3VA1 frame (typically 76.2 mm or 101.6 mm) — expect to account for the extra panel width in your layout. The busbar connection on the front terminals means it mates directly to a busbar system rather than lug terminals; verify your panel's busbar pitch matches the 3VA1 front-terminal pattern before ordering. The unit accepts an optional motor drive for remote switching.