What it is and what it does
The Siemens 3VA1132-4EF32-0CC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 3-pole unit rated at 32 A continuous current, with an insulation voltage of 800 V, so it handles standard 400 V and 480 V distribution without derating the insulation.
Interrupting capacity — what the ratings mean
The interrupting capacity tells you the maximum fault current this MCCB can safely clear. At 240 V it's rated 121 kA, at 415 V it's 75.6 kA, at 440 V it's 52.5 kA, and at 500 V and 690 V it holds at 11.9 kA. That's a high-interrupting-capacity (HIC) device — suitable for main or tie breakers in panels with high available fault current, not just branch feeders.
Thermal derating — real-world current
The breaker is rated 32 A from 40 °C up to 50 °C ambient. At 55 °C and 60 °C it derates to 31 A, and at 65 °C and 70 °C it's 30 A. That means in a warm panel — say 55 °C — you lose 1 A of headroom. If you're loading it near 32 A continuous in a hot enclosure, factor that 31 A limit into your design.
Built-in auxiliary devices
This MCCB ships with two factory-fitted auxiliary switches (HQ design) and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops below a threshold — common for emergency-stop circuits or undervoltage protection on motor feeders. The auxiliary switches give status feedback to a PLC or indicator lamp without adding external relays.
Panel fit and dimensions
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 3-inch width is standard for a 3-pole MCCB in a SENTRON panel — it clips onto the DIN rail and occupies one 3-pole position. No special adapter needed for a standard Siemens distribution board.