What the ratings mean for fit
The Siemens SENTRON 3VA2116-5JQ32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 160 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal calculations. The interrupting capacity at 240 V is 187 kA, dropping to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a fault of that magnitude without upstream cascading — critical for high-fault service entrances or transformer secondaries. The minimum adjustable trip is 240 A; the maximum is 1 600 A, giving a wide band for coordination studies. The breaker includes an undervoltage release (UVR) and two auxiliary switches (HQ type) — the UVR drops the load if supply voltage falls below a set threshold, protecting motors or sensitive downstream equipment from brownout conditions. The communication function (Ethernet or fieldbus via an optional module) allows remote trip indication and status monitoring, which is useful for a line-down diagnostic or SCADA integration. The supplied basic switch is order code 3VA21165JQ320AA0.
Panel integration and environment
Dimensions are 86 mm deep, 105 mm wide, 181 mm high — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 28 W, which should be factored into enclosure ventilation if the breaker is in a sealed cabinet with other heat sources.