SENTRON 3VA1050-2ED42-0CH0 — 50 A MCCB for Line Protection
The Siemens SENTRON 3VA1050-2ED42-0CH0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 50 A rated current at 40 °C and delivers a 52.5 kA breaking capacity at 240 V AC — the figure that governs its fault-interruption capability at common low-voltage supply points. The 800 V rated insulation voltage tells you the buswork and internal clearances are sized for 690 V systems, so it slots into 400 V or 480 V panels with headroom.
Breaking Capacity Across Voltage Levels
The interrupting rating drops as system voltage rises: 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V (–). For a 480 V delta panel, the 13.6 kA figure is the one to coordinate with — verify it exceeds the available fault current at the point of installation. The 52.5 kA at 240 V covers high-fault scenarios on split-phase or 240 V line-to-line feeds.
Thermal Derating and Power Loss
Rated current holds at 50 A from 40 °C through 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C (–). If the breaker lives in a crowded enclosure with ambient above 50 °C, the 45–49 A range is your real continuous capacity. Maximum power loss is 17.1 W — negligible for most panels but worth checking if multiple breakers sit in a sealed, uncooled compartment.
Auxiliary and Release Configuration
This variant includes an undervoltage release (UVR) and is equipped with 2 auxiliary switches plus 1 trip alarm switch (HQ). The UVR drops the breaker on loss of control voltage — standard for safety circuits where a downstream contactor or safety relay must not re-energize until voltage is restored. The trip alarm switch signals the breaker's thermal-magnetic trip separately from manual open, useful for remote fault annunciation.
Physical Fit and Environmental Range
Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm high (–). The 101.6 mm width is a standard 4-inch footprint for a 4-pole MCCB — it occupies one full modular position in a SENTRON distribution panel or any DIN-rail adapter. Operating temperature spans -25 °C to 70 °C, storage from -40 °C to 80 °C. The operating range covers most indoor industrial enclosures; the storage range accommodates unheated warehouses.