The Siemens 3VA1116-4EF32-0AA0-ZD00 is a 3-pole IEC frame 160 circuit breaker with breaking capacity class S, rated for 36 kA Icu at 415 V. It uses a TM240 thermal-magnetic trip unit — the thermal element adjustable from 112 A to 160 A (Ir), and the magnetic pickup fixed at 5 to 10 times In (800–1600 A). That means it's sized for a 160 A feeder or large motor branch circuit where you need selectivity headroom downstream.
Mounts on standard DIN rail or panel-mount via the 3VA1 frame's integral lugs. The nut keeper kit (included per the order-code suffix) is for DC Power OEM builds in China — keeps the terminal nuts captive during assembly, which saves time on a panel line. No special tooling needed beyond a torque screwdriver.