The Siemens 3VM1225-5GD42-0AA0 is a 4-pole circuit breaker on the 3VM1 IEC frame, rated 250 A with a breaking capacity class M — Icu of 55 kA at 415 V. It uses a TM210 thermal-magnetic trip unit, fixed at Ir = 250 A for overload and Ii = 10 × In (2500 A) for short-circuit protection, with 100 % N-conductor protection. The FTFM (Fixed Thermal, Fixed Magnetic) trip means neither overload nor short-circuit pickup is field-adjustable — what you order is what protects the feeder. This is a line-protection breaker, not a motor-protection device; the fixed magnetic trip at 10× In is sized for cable and busbar protection, not for starting inrush.
Note the product class C designation: this unit is manufactured or produced to order, which means it cannot be reused, re-utilized, or returned for credit. Confirm the order code and ratings before committing the PO — once produced, it is dedicated to that order. RoHS compliance is confirmed since 01-06-12. REACH Article 33 information is available on request.
Packaged dimensions are 175 × 160 × 123 mm (L × W × H). The fixed-trip design means no adjustment knobs to accommodate on the panel face — just the handle and the nameplate.