Siemens 3VA1220-4EF42-0CH0 SENTRON MCCB, 200 A, 4-Pole, 70 m

The 3VA1220-4EF42-0CH0: Rated current holds at 200 A from 40 °C through 50 °C, then derates linearly to 176 A at 70 °C. That thermal curve means the breaker can be loaded to nameplate in most ventilated enclosures; only tight-gland or high-ambient panels need the derated figure. Breaking capacity steps down with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. For a 480 V panel (common in North American industrial) the 52.5 kA at 440 V is the closest published figure — still well above typical 25–35 kA available fault currents. This variant includes an undervoltage release (UVR) and comes fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ type). The UVR drops the breaker on loss of control voltage — useful for emergency-stop circuits or undervoltage protection on motor feeds. No ground-fault monitoring or communication module on this build. Dimensions are 158 mm high, 140 mm wide, 70 mm deep — a standard SENTRON 3VA footprint that fits existing Siemens switchboard layouts and most DIN-rail adapters. Insulation voltage rated 800 V, so it's suitable for 690 V systems with margin. Maximum power loss at rated load is 44.5 W — factor that into enclosure thermal calculations.