The Siemens 3VA1220-5EF32-0AA0-ZD00 is a 3-pole IEC frame 250 circuit breaker with a 200 A continuous rating (In=200 A) and a breaking capacity class M — Icu=55 kA at 415 V AC. The TM240 thermal-magnetic trip unit gives adjustable overload protection (Ir=140 A to 200 A) and fixed short-circuit protection (Ii=5 to 10 × In), so you set the Ir to match the conductor or load ampacity, not the frame size.
Deployment context
The nut keeper kit included is specific to DC Power OEM builds in China — it secures the breaker against vibration in transport or high-vibration line-side applications. The 3-pole form factor handles three-phase loads; the 200 A frame and 55 kA SCCR suit it for main or feeder protection in industrial switchboards where fault currents run high.