Line protection breaker, 50 A frame, 4-pole
The Siemens SENTRON 3VA1050-2ED42-0AH0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection, rated 50 A at 40 °C with a TM210 thermal-magnetic release. It carries a breaking capacity of 52.5 kA at 240 V AC, derating to 32 kA at 415 V and 13.6 kA at 440 V — figures that govern its fault-clearing capability in a given installation voltage.
What the ratings mean for panel fit
The 50 A rating holds flat from 40 °C through 50 °C ambient, then derates to 49 A at 55 °C and 45 A at 70 °C. In a sealed enclosure with internal heat rise, that derating curve is the number that decides whether the breaker holds a continuous 48 A load without nuisance tripping. Width is 101.6 mm (4 in), depth 70 mm (2.76 in), height 130 mm (5.12 in) — fits a standard 4-pole MCCB footprint on DIN rail or panel-mount base. The 4-pole construction means it switches all three phases plus neutral, typical for TN or TT systems where the neutral must be switched and protected. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems (where its breaking capacity is 7.5 kA) without additional series protection for the insulation withstand.
Release and auxiliary switch configuration
Fitted with a TM210 thermal-magnetic overcurrent release — the '210' indicates the release type within the SENTRON 3VA platform, providing fixed thermal and magnetic trip settings for line protection. No undervoltage release, no ground-fault monitoring, no communication module on this variant. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving remote status indication of the main contact position and a separate signal for fault tripping. Maximum power loss is 14.6 W — relevant for thermal budgeting inside a compact panel.