What it is — and what the ratings mean for fit
The Siemens 3VA1116-5EF42-0CH0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Four poles, rated 160 A continuous at 40 °C — and it holds that same 160 A all the way up to 50 °C before it starts to derate (158 A at 55 °C, 155 A at 60 °C, 153 A at 65 °C, 150 A at 70 °C). That thermal curve means you don't lose headroom in a warm enclosure; the breaker is effectively flat-rated through most real-world panel ambient conditions. Breaking capacity is the headline number for fault duty: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 500 V and 690 V. That's a high-interrupting rating for a 160 A frame — it handles high available fault current at the lower voltages typical of North American 240/480 V panels, and still clears at 690 V for European or marine distribution. Insulation voltage rated 800 V, so the internal clearances are built for 690 V systems without derating the dielectric.
Panel integration — what the dimensions mean for the cutout
Width 101.6 mm (4 in), depth 70 mm (2.76 in), height 130 mm (5.12 in). That 70 mm depth is shallow enough to clear most standard gland plates and backpanel wiring troughs — no need to recess the breaker or use a deep enclosure just to fit it. The 4-pole width is fixed; if your panel was laid out for a 3-pole frame, you'll need the extra module space. DIN-rail or screw-mount, the footprint is the same across the 3VA family, so swapping between variants doesn't require re-drilling the backplate.
What's on the breaker — auxiliary and release configuration
Comes with 2 auxiliary switches plus 1 trip alarm switch (HQ type), and an undervoltage release (UVR) built in. The UVR means the breaker trips when control voltage drops — common for emergency-stop circuits or undervoltage protection on motor feeders. No ground-fault monitoring module on this variant (the 'Without' ground-fault version). Trip indicator is present, so you get a visual flag on the front after a fault trip. Power loss at full load is 40.5 W maximum — factor that into enclosure thermal calculations if you're packing multiple breakers in a small cabinet.