System protection MCCB with TM210 release
The Siemens 3VA4195-4ED54-0AA0 is a 1-pole SENTRON molded-case circuit breaker (MCCB) designed for system protection — meaning it protects cable and bus, not a specific motor or device. Its TM210 thermal-magnetic release combines a thermal bimetal for overload protection and a magnetic coil for short-circuit interruption. Rated 15 A at 40 °C, it derates to 13 A at 70 °C, so the actual ampacity in a warm panel is lower than the nameplate suggests — plan your load at the expected ambient, not the 40 °C reference. Interrupting capacity is 65 kA at 120 V AC, dropping to 25 kA at 277 V and 14 kA at 347 V. On a 415 V AC rated system, the available fault current must be coordinated with these numbers — if your panel SCCR exceeds 14 kA at 347 V, this breaker may not clear a bolted fault upstream. The 1-pole format fits a single-phase branch or a DC string (per the 3VA DC manual), but verify polarity and arc extinction for DC use.
Thermal derating and panel integration
Width is 50.8 mm (2 in) — a standard 2-module DIN-rail footprint that matches other SENTRON 3VA breakers. Depth of 75.1 mm means it clears most 100 mm-deep enclosures, but check gland-plate clearance if the breaker is mounted near the back wall. IP40 on the front face protects against tools and solid objects larger than 1 mm; the rear is open to the panel interior, so the enclosure IP rating governs overall ingress protection. Maximum power loss is 3.3 W — negligible for thermal budgeting in a single unit, but if you pack twenty of these in a row, that's 66 W of heat to vent. The TM210 release has no trip indicator and no undervoltage release, so a downstream contactor or shunt trip must handle remote opening. No ground-fault monitoring version is fitted; add an external GFCI module if ground-fault protection is required.