What the ratings mean for fit
The Siemens SENTRON 3VA1110-5EE32-0DC0 is a 3-pole molded case circuit breaker rated for a continuous current Iu of 100 A at ambient temperatures up to 50 °C, with no derating needed in that band. Above 50 °C the thermal curve steps down: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. That means a panel running at 55 °C ambient loses 4 A of headroom — a detail the spec table alone doesn't flag, but one that matters for a BOM freeze in a warm enclosure. The TM220 thermal-magnetic release provides fixed thermal and magnetic trip thresholds; no voltage trigger or communication function is built in. Breaking capacity is rated per the evidence at 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. For a 400 V-class distribution board the 121 kA figure is the one that governs SCCR coordination — it safely interrupts faults up to that level without cascading upstream. The rated insulation voltage Ui is 800 V, which covers most industrial line-to-line systems up to 690 V with margin. The front face carries an IP40 rating, suitable for dry indoor panel environments. An undervoltage release (UVR) is fitted as standard, and the auxiliary contact block is a 2-switch HQ version (order code 3VA9608-0BB25 for the integrated auxiliary trip). No ground-fault monitoring or phase-failure detection is included.
Deployment context
This MCCB is designed for DIN-rail or panel-mount installation in a standard distribution board. The 76.2 mm width (roughly 3 inches) and 130 mm height fit a typical 3-pole MCCB footprint; the 70 mm depth leaves clearance for rear-connected busbars or cable ducts. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.