32 A MCCB with 187 kA interrupt rating — the line-protection variant
The Siemens SENTRON 3VA1132-5GD42-0AA0 is a 4-pole molded case circuit breaker (MCCB) carrying a permanent rated current Iu of 32 A at 40 °C, with the TM210 thermal-magnetic release tuned for line protection rather than motor or generator duty. The TM210 designation means the thermal pickup is fixed at 1.0 × In and the magnetic short-circuit trip is set at 10 × In — a standard distribution profile that avoids nuisance tripping on transformer inrush or capacitor banks. Breaking capacity hits 187 kA at 240 V AC and still delivers 121 kA at 415 V and 75.6 kA at 440 V, tapering to 17 kA at 500 V and 690 V. Those figures place it comfortably above typical utility fault levels for North American 480Y/277 V and European 400 V panels — the SCCR headroom means it can be installed without cascading an upstream current-limiting fuse for most industrial service entrances. Panel footprint is 130 mm high × 101.6 mm wide × 70 mm deep, with IP40 protection on the front face. The 100 % N-conductor protection design means the neutral pole is fully rated — no derating needed when feeding single-phase loads from a 4-pole breaker in a three-phase-plus-neutral system.
Thermal derating and operating envelope
Rated current holds at 32 A from 40 °C through 50 °C ambient, then gently tapers to 31 A at 55–60 °C and 30 A at 65–70 °C. The maximum operating temperature is 70 °C, with a minimum of −25 °C; storage range extends from −40 °C to 80 °C. Power loss at rated load is 10.6 W maximum — negligible for panel thermal budgeting but worth checking if the breaker is tightly ganged in a multi-unit enclosure. Rated insulation voltage Ui is 800 V, and the maximum rated operational voltage Ue in DC circuits is 600 V. The IP40 front protection means the breaker face is sealed against tools and small solids but not against water ingress — appropriate for dry indoor panelboards, not washdown zones.
Lifecycle and sourcing posture
The breaker accepts an optional motor drive, which is relevant for remote-tripping or generator-paralleling schemes. No communication function is built in — this is a standalone thermal-magnetic MCCB, not a communicating power breaker. Ground-fault monitoring is not included; a separate GF module or upstream RCD would be needed for personnel protection.
Integration and panel fit
The 101.6 mm width matches the standard 4-inch MCCB pole spacing for North American panelboards — a direct swap into existing SENTRON 3VA1 or competitive 4-pole breaker slots without bus-bar rework. Depth of 70 mm keeps the breaker inside typical 6-inch deep enclosures without door interference. Reference code per IEC 81346-2 is Q (switching device). The front face carries IP40 protection, which is adequate for most IEC 61439 switchboard assemblies where the breaker is behind a door or cover.