What the breaking capacities mean for panel coordination
The Siemens 3VA1196-4EF32-0AB0 is a SENTRON molded case circuit breaker rated for line protection in three-phase distribution. Its 121 kA breaking capacity at 240 V AC and 75.6 kA at 415 V AC mean it can interrupt fault currents at those levels without upstream fuses blowing — critical for maintaining selectivity in a multi-level panel where a downstream fault must not take out the main feed. The 52.5 kA at 440 V and 11.9 kA at 690 V cover the higher-voltage end of industrial supplies, though the 690 V figure is notably lower, so check the available fault current at that voltage before committing the BOM line.
Thermal derating and the TM240 release
Rated continuous current Iu is 16 A, and the breaker holds that current from 40 °C up to 50 °C with no derating. Above 50 °C the curve drops: 15.36 A at 55 °C, 15.04 A at 60 °C, 14.72 A at 65 °C, 14.4 A at 70 °C. If the panel ambient runs hot — say inside a non-ventilated enclosure near transformers — plan for that 1.6 A loss at the top end. The TM240 overcurrent release is thermal-magnetic, adjustable with a maximum response time tr of 1 second, so it coordinates with downstream breakers on time-current curves.
Physical fit and panel integration
The 3VA1196-4EF32-0AB0 measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard three-pole MCCB footprint that drops into a SENTRON panelboard or onto a mounting plate without re-drilling. IP40 on the front means it is protected against tools and wires >1 mm, but not against water ingress; keep it inside the enclosure, not on a washdown wall. Two auxiliary switches (HP type) are built in for status feedback to a PLC or remote indication — no separate aux block to order.