What this breaker is and what the ratings mean
The Siemens SENTRON 3VA2216-7KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 160 A continuous current across the full ambient range from 40 °C to 70 °C, with no derating needed up to that ceiling. That flat thermal curve means the breaker holds its 160 A rating in a warm panel — a real advantage when the enclosure sits near a motor or in a non-conditioned electrical room. The interrupting capacity is the headline: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V. Those numbers mean it can clear a bolted fault on the secondary side of a large distribution transformer without the arc re-striking — the sort of fault current you'd see on a 2 MVA unit feeding a switchboard. The 4.5 kA at 690 V is the ceiling for that voltage class; if your system runs 690 V with higher available fault, you need a current-limiting fuse upstream. The ETU850 electronic trip unit handles the protection curve — adjustable long-time, short-time, instantaneous, and ground-fault (though this unit ships without ground-fault monitoring). The breaker includes a communication function, which lets a BMS or SCADA read trip status, load current, and breaker position without hardwiring aux contacts. Physical footprint: 140 mm wide, 181 mm tall, 86 mm deep. IP40 on the front — fine for a clean indoor panel, but not for washdown or outdoor exposure.
Integration notes for the panel builder
Mounts on a DIN rail or direct-panel mount via the standard 3VA lug kit. The 140 mm width occupies 8 TE (8 x 17.5 mm) on a DIN rail — plan the rail layout accordingly. The ETU850 draws its power from the internal current transformers, so no auxiliary supply needed for the trip unit. The communication module (ordered separately) plugs into the front slot and adds a second address on the fieldbus. If you're replacing a 3VA2116-5JP32-0AE0 in an existing panel, check the lug positions: the 7KP42 variant uses a different lug arrangement — the bus-bar drill pattern may not align without re-drilling the copper.
What the 160 A continuous rating means in practice
The 160 A rating is flat from 40 °C to 70 °C ambient — no thermal derating curve to calculate. The insulation voltage is rated 800 V, so the breaker can be used on 690 V systems without a voltage derating. The maximum power loss at rated current is 19.7 W.