Line protection MCCB with ETU320 — 63 A frame, 3-pole, shunt trip
The Siemens 3VA2063-6HL32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection duty, carrying a continuous current Iu of 63 A across its full 40 °C to 50 °C ambient range, with a slight thermal derating to 60.6 A at 55 °C and 53.6 A at 70 °C.
Breaking capacity — what the voltage-dependent ratings mean for panel coordination
This breaker delivers 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V. At 415/440 V the 187 kA rating still exceeds what most distribution transformers behind a typical 2000 kVA unit can deliver, so selectivity with downstream breakers is achievable without oversizing the main.
Dimensions are 181 mm height, 105 mm width, 86 mm depth — a standard SENTRON 3VA2 frame footprint. The 105 mm width across three poles matches the typical 35 mm per-pole spacing on DIN-rail or backplate layouts. Maximum power loss is 5.4 W, so no forced cooling is required in a standard IP30 enclosure but adjacent devices should not be thermally blanketed.