160 A MCCB with TM240 Release — What the Ratings Mean for Your Panel
The Siemens SENTRON 3VA1116-6EF32-0DC0 is a 3-pole molded case circuit breaker rated for 160 A continuous current, fitted with a TM240 thermal-magnetic overcurrent release. That TM240 designation means the thermal pickup is fixed at 160 A (the frame rating), while the magnetic short-circuit trip is set at 240 A — so it protects a 160 A feeder against overloads and low-level faults, but lets short-duration inrush from motor loads or transformers pass without nuisance tripping. The 160 A rating holds steady from 40 °C up to 50 °C ambient; above that it derates in steps to 144 A at 70 °C, which matters if this breaker lands in a hot enclosure near other heat sources. Breaking capacity is where this breaker earns its keep in high-fault panels. At 240 V it interrupts 220 kA; at 415 V, 154 kA; at 440 V, 75.6 kA; and at 690 V, 17 kA. Those numbers cover everything from a 240 V lighting panel to a 690 V industrial motor center. The 220 kA at 240 V is serious — it can sit ahead of a transformer secondary or a distribution board fed from a large utility service without needing a current-limiting fuse upstream.
Built-In Undervoltage Release and Auxiliary Contacts
This version ships with an undervoltage release (UVR) — it trips the breaker when supply voltage drops below a threshold, which is standard for safety circuits where a machine must drop out on brownout or power loss. The UVR is designed into the breaker body, not a field-add-on, so the wiring plan needs to account for the release coil supply. Two HQ auxiliary switches are integrated for status feedback to a PLC or pilot light; they change state with the main contacts, not the UVR, so you get a reliable open/closed signal independent of the undervoltage condition. The breaker mounts with a 76.2 mm width and 130 mm height — standard SENTRON 3VA footprint for the 160 A frame. Depth is 70 mm from the mounting surface to the front of the handle. That 70 mm depth fits inside most 200 mm deep enclosures with room for wiring gutters. The front is rated IP40, so it's fine for a dry indoor panel but not washdown areas.
Does It Drop Into a Panel Built for the 3VA1112-5EF32-0CA0?
If you're swapping from the 3VA1112-5EF32-0CA0 (a 125 A frame with an ETU electronic trip), the 3VA1116-6EF32-0DC0 shares the same 76.2 mm width and 130 mm height — same mounting hole pattern, same bus-bar spacing for a 3-pole SENTRON. The depth is identical at 70 mm. No rewiring of the line or load lugs is needed; the physical footprint is a drop-in. What changes is the trip curve: the TM240 is thermal-magnetic, not electronic, so coordination studies and arc-flash labels need updating. The auxiliary contact count matches (2 HQ on both), and the UVR is present on both variants.
Line Protection — No Communication, No Ground Fault
This is a straight line-protection breaker — no communication module, no ground-fault monitoring, no phase-failure detection. It's a basic thermal-magnetic MCCB for feeder protection where you don't need remote trip indication or leakage monitoring. The integrated auxiliary trip (3VA9608-0BB25) is the only accessory release beyond the UVR; there's no shunt trip or voltage trigger on this variant. If your spec calls for ground-fault or Modbus, you'd step up to the 3VA1 ETU series.