What this MCCB is and where it fits
The Siemens 3VA1216-5MH32-0AD0 is a SENTRON molded case circuit breaker (MCCB) configured as a starter protection device — meaning it combines motor branch-circuit protection with switching capability, not just cable protection. It carries a rated continuous current Iu of 160 A and uses a TM120M thermal-magnetic release, so the thermal element handles overloads and the magnetic element clears short-circuits without external trip units. The 3-pole design fits three-phase motor loads up to 55 W operating power at AC-3 duty at 400 V, which is the standard motor-switching category per IEC 60947-4-1. Panel builders will note the 105 mm width, 158 mm height, and 70 mm depth — it occupies a standard SENTRON 3VA mounting footprint on a DIN rail or base plate.
Breaking capacity — what the numbers mean for your fault level
This MCCB's interrupting rating varies sharply with system voltage: 187 kA at 240 V AC, 121 kA at 415 V, 30 kA at 440 V, and 17 kA at 690 V. The 187 kA figure at 240 V is exceptionally high — it handles faults on low-voltage secondary sides of large transformers without needing a current-limiting fuse upstream. At 415 V the 121 kA rating still covers most industrial distribution panels. At 690 V the 17 kA rating is adequate for typical 690 V motor control centers but not for high-fault utility tie points. The key takeaway: verify your available fault current at the installation point against the rating at your actual line voltage — using the 415 V rating at a 440 V supply would overstate the breaker's capability.
Thermal derating — don't lose capacity to heat
The 160 A continuous rating holds flat from 40 °C through 50 °C ambient. Above that it derates: 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C. If this breaker lives in a non-ventilated enclosure near other heat sources, use the 60 °C or 65 °C column for your actual load calculation — the 160 A nameplate only applies when the surrounding air stays at or below 50 °C. The operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Auxiliary contacts and protection class
The breaker ships with 3 auxiliary switches (HQ type) — these are factory-installed, not field-added. They provide status feedback (open/closed/tripped) to a PLC or indication lamp without external interposing relays. The front face carries IP40 protection, meaning tools or fingers won't contact live parts, but the body is not sealed against water ingress — mount it inside a panel, not in a washdown zone.