The 3VA1120-6GF46-0KF0 is a SENTRON molded case circuit breaker from Siemens, rated for 20 A continuous and built for line protection in distribution panels. Four poles, 70 mm deep, 101.6 mm wide — fits standard MCCB mounting footprints in switchgear. Breaking capacity hits 220 kA at 240 VAC, dropping to 154 kA at 415 V and 121 kA at 440 V, so it handles high-fault utility feeds without cascading upstream. Insulation voltage rated at 800 V, which gives headroom for 480/600 V systems.
Breaking capacity and coordination
At 240 V you get 220 kA SCCR — that's utility-grade fault handling for service entrance or large subfeeds. At 500 V and 690 V the rating drops to 17 kA, still enough for most motor branch circuits and downstream panels. The 4-pole design handles three-phase plus neutral, common in North American and European distribution. Thermal derating holds 20 A flat from 40 °C through 55 °C; at 70 °C it's still 19 A, so no panic in a warm enclosure.
Auxiliaries and releases
This variant ships with a shunt trip (STL) for remote tripping and one auxiliary switch plus one trip alarm switch (HQ configuration). The auxiliary switch tracks the breaker position; the trip alarm signals only on a fault trip, not manual open — useful for alarm annunciation in critical feeders. No undervoltage release fitted, no ground-fault monitoring, no communication module. The basic switch inside is order code 3VA11206GF460AA0, which is the replaceable core if the mechanism wears.