The Siemens 3VA1163-5GF42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 63 A continuous, with a TM240 thermal-magnetic overcurrent release. It's built for line protection in distribution panels where high fault current capacity is the deciding spec — 187 kA at 240 V AC, dropping to 121 kA at 415 V, then 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. The insulation voltage is rated 800 V, so it handles 480 V and 600 V class systems without issue. The TM240 release means the thermal element is calibrated for a 240 A frame — the breaker's continuous rating is set by the installed trip unit, here 63 A. That gives you a 63 A MCCB on a 240 A frame, which means the interrupting capacity is frame-limited, not trip-limited. The 187 kA at 240 V is the frame's maximum; you get that full capability at the 63 A setting.
Thermal derating and panel integration
This breaker holds full 63 A rating from 40 °C through 50 °C ambient. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. That's a shallow derating curve — only 5 A lost over a 20 °C rise above 50 °C — so it's forgiving in a tightly packed enclosure. The front face carries IP40 protection; the rest of the body is open to the panel interior. Mounts on a DIN rail or direct panel; dimensions are 130 mm high, 101.6 mm wide, 70 mm deep. The 70 mm depth means it clears most standard gland plates and backpan covers without interference.
What the breaking capacity curve means for your system
The 187 kA at 240 V is typical for a high-interrupting MCCB on a 240 V delta or 277/480 V wye system's line-to-neutral fault path. At 415 V (common 400 V class three-phase) the 121 kA still covers most industrial transformer secondary faults. At 500 V and 690 V the rating drops to 17 kA — still adequate for motor branch circuits on 600 V class systems where available fault current is usually under 10 kA. The 800 V insulation voltage gives headroom for 690 V systems without requiring a series-rated combination.