The Siemens 3VM1220-5ED42-0AA0 is a 4-pole molded case circuit breaker from the 3VM1 IEC frame 250 series, rated 200 A with a breaking capacity of 55 kA at 415 V (class M). The TM210 trip unit provides fixed thermal-magnetic overload protection set at Ir=200 A (non-adjustable) and a short-circuit pickup of Ii=10 × In, so it trips instantaneously at 2000 A. The N conductor is unprotected, which is standard for line-side protection where the neutral is bonded to ground.
Packaging dimensions are 175 × 160 × 123 mm — allow that envelope plus finger clearance per IEC 61439 for busbar and cable terminations. The 4-pole form factor fits standard Siemens 3VM1 accessory range (shunt trip, auxiliary contacts, motor operator) for remote or automated disconnection.