The Siemens 3VA2116-5KP32-0AJ0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 160 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, plus a communication function for remote monitoring and settings. Interrupting capacity hits 187 kA at 240 V, 121 kA at 415/440 V, and still holds 75.6 kA at 500 V — high enough for most main feeder or large motor branch applications where fault current is substantial.
What the ratings mean for fit
The 160 A rating is the continuous current the breaker carries without tripping — it's the same at 40 °C and 70 °C, so you don't lose headroom in a hot panel. The interrupting ratings tell you the maximum fault current the breaker can safely clear at each voltage: 187 kA at 240 V is typical for a main on a large low-voltage transformer; 121 kA at 415 V covers most industrial distribution; the drop to 3.7 kA at 690 V means this frame is not intended for 690 V main service — it's a 480 V class device. The ETU850 trip unit gives you curve shaping (LSIG) and communication, so it's suited for selective coordination studies and remote trip diagnostics.
Panel integration
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep. Front IP40 protection means it's splash-protected on the face. The ETU850 supports communication, so plan for a communication cable route to the panel controller. The trip indicator is visible on the front.