What it is and what it does
The Siemens 3VA1220-5EF42-0HG0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Four poles, rated 200 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. That 187 kA rating means it can safely clear a fault current up to that level without rupturing — critical for high-fault locations like substation feeders or large motor control centers where available fault current is high.
Ratings and what they mean for fit
Rated 200 A at 40 °C, derated to 176 A at 70 °C — the thermal curve is linear, so if your panel ambient runs hot, the breaker's continuous current drops. Interrupting capacity steps down with voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. That voltage-dependent curve is typical for MCCBs; the 690 V rating is still high enough for most 480/277 V or 600 V industrial services. Insulation voltage rated 800 V, so it's suitable for 690 V systems with margin.
Panel integration and accessories
Dimensions: 140 mm wide, 158 mm tall, 70 mm deep — fits standard MCCB panel cutouts. Comes with one auxiliary switch and one trip alarm switch (HP design), plus a shunt trip release (STL) for remote tripping. No undervoltage release, no ground-fault monitoring, no communication module — it's a basic line-protection breaker with remote trip capability. The supplied basic switch is 3VA12205EF420AA0.