Key ratings and what they mean for fit
The Siemens 3VA1112-5GE46-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated 125 A continuous, with a TM220 thermal-magnetic trip unit — that is a fixed, non-interchangeable release designed for line protection in distribution panels. The 125 A rating holds flat from 40 °C up to 50 °C ambient; above that it derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C, so in a warm enclosure you need to account for the reduced capacity rather than rely on the nominal number. Interrupting capacity is the headline differentiator here: 187 kA at 240 VAC, 121 kA at 415 VAC, 75.6 kA at 440 VAC, and 17 kA at both 500 VAC and 690 VAC. Those figures mean this breaker can be applied on high-fault panels where a standard 25 kA or 36 kA MCCB would fail to clear a bolted fault — think large transformer secondaries, busway feeds, or main disconnects in industrial switchboards. The 800 V rated insulation voltage (Ui) supports use on 690 V systems with margin. Power loss is 28.1 W maximum at rated current — relevant for thermal budgeting inside a sealed enclosure. The front face carries IP40 protection (finger-safe, no water ingress), so it suits indoor panel mounting but not washdown environments. Dimensions are 101.6 mm wide (4 in), 130 mm high (5.12 in), 70 mm deep (2.76 in) — a 4-pole frame that fits standard SENTRON mounting patterns.
Integration and deployment context
Mounts on a DIN rail or panel-mount baseplate inside a standard industrial enclosure. The 4-pole configuration handles three-phase plus neutral switching, common for main or feeder breakers in 400 VAC distribution. No undervoltage release, no shunt trip, no communication module on this variant — it is a straight thermal-magnetic breaker with no auxiliary electronics, so commissioning is simple: torque the line and load lugs to the values in the terminal marking, verify the trip curve matches the downstream cable protection, and close the cover.