SENTRON 3VA1050-4ED42-0AA0 — 50 A MCCB for Line Protection
The Siemens SENTRON 3VA1050-4ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C ambient. Its TM210 thermal-magnetic overcurrent release handles overload and short-circuit trip curves without external control wiring — a straightforward drop-in for distribution panels where a fixed-trip breaker is specified. Breaking capacity reaches 121 kA at 240 VAC and 75.6 kA at 415 VAC, giving selectivity headroom for high-fault service-entrance or sub-distribution boards. The 800 V rated insulation voltage supports 690 V line-to-line systems common in European industrial networks. The TM210 release is a fixed thermal-magnetic type — no interchangeable trip units, no communication module, no ground-fault monitoring. This keeps the BOM simple and the panel wiring predictable: line in, load out, no auxiliary connections needed for basic overcurrent protection.
Panel Fit and Thermal Derating
Dimensions are 101.6 mm wide, 130 mm high, and 70 mm deep — a standard 4-pole MCCB footprint that fits SENTRON distribution boards and most DIN-rail or mounting-plate layouts. The front face carries an IP40 protection rating, meaning tools and fingers are kept out but the breaker is not sealed against washdown; install inside a panel enclosure. Thermal derating is gradual: the breaker holds 50 A from 40 °C through 50 °C, then drops to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C (–). In a crowded panel with multiple breakers side by side, expect to apply the 60 °C column for realistic continuous load — 48 A per pole, not the full 50 A nameplate. Maximum power loss is 14.6 W. In a multi-breaker enclosure, sum the losses to check internal temperature rise against the panel's dissipation rating.