What it is and what it does
The Siemens 3VA1220-5GF42-0DC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 4-pole unit rated at 200 A continuous, with a maximum power loss of 44.5 W at rated load. The 200 A rating holds flat from 40 °C up to 50 °C, then derates linearly to 176 A at 70 °C — so in a warm panel near the top of its 70 °C operating limit, you lose about 12% of the headline current.
Interrupting capacity — what the numbers mean
Interrupting ratings climb as system voltage drops: 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. At 415 V — common for industrial distribution in much of the world — the 121 kA rating covers high-fault scenarios like transformer secondaries or large motor banks. The rated insulation voltage is 800 V, so the breaker's internal clearance and creepage are sized for 690 V systems.
Built-in release and auxiliary switch configuration
This MCCB ships with an undervoltage release (UVR) fitted — when control voltage drops below the dropout threshold, the breaker trips. That's useful for emergency-stop circuits or undervoltage protection on motor feeders. It also carries two HQ auxiliary switches for remote status indication. The basic switch core is order code 3VA12205GF420AA0. No communication function, no ground-fault monitoring, no voltage-trigger option on this variant.
Panel fit and environment
Dimensions: 158 mm high, 140 mm wide, 70 mm deep — a standard 4-pole MCCB footprint for DIN-rail or screw-mount panel integration. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. No trip indicator on the front face, so fault indication relies on the auxiliary switches or a downstream annunciator.