SENTRON 3VA2 MCCB — 63 A, 187 kA at 240 V
The Siemens 3VA2063-5HN32-0JA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a 3-pole configuration and an ETU350 electronic trip unit. Its interrupting capacity reaches 187 kA at 240 V AC, derating to 121 kA at 415/440 V, 79 kA at 500 V, and 3.4 kA at 690 V — a curve that governs selectivity coordination downstream. The breaker carries a shunt trip (STL) auxiliary release and is built for line protection duty in distribution panels.
Breaking capacity and thermal derating
At 240 V this breaker clears 187 kA — enough for high-fault utility feeds. At 415/440 V it holds 121 kA, dropping to 79 kA at 500 V and 3.4 kA at 690 V. The 63 A rating is flat from 40 °C to 50 °C; above that it derates linearly to 53.55 A at 70 °C. That derating curve is what governs real panel loading when ambient climbs near the upper operating limit of 70 °C.
Integration and panel fit
The breaker occupies 105 mm width × 181 mm height × 86 mm depth on the DIN rail or mounting plate. The ETU350 trip unit is field-adjustable; the shunt trip (STL) auxiliary release is factory-integrated. No auxiliary contact block or communication module is included — the order code specifies a bare line-protection breaker with undervoltage trigger capability.