Line protection breaker with a full interrupting curve
The Siemens 3VA2163-6HN32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C through 70 °C — no derating needed across that band. That's a solid 63 A all the way, so you don't have to oversize for a warm panel. It's a 3-pole unit designed for line protection, meaning it guards the feeder, not a specific motor or load. Interrupting capacity is the headline here: 242 kA at 240 VAC, 187 kA at 415/440 VAC, 121 kA at 500 VAC, and 3.7 kA at 690 VAC. That 242 kA figure at 240 V is high for a 63 A frame — it handles a stiff utility feed or a transformer secondary without needing a current-limiting fuse upstream. At 690 V the rating drops to 3.7 kA, which still covers most industrial motor circuits at that voltage.
Built-in undervoltage release and auxiliary switching
This breaker ships with an undervoltage release (UVR) factory-fitted — it trips the breaker if the control voltage drops below a set threshold, which is standard for safety circuits that need to drop power on loss of control supply. It also carries two auxiliary switches plus a separate trip alarm switch (HQ), so you get status feedback for open/closed and a dedicated signal for a fault trip. That's enough for a PLC input or a remote annunciator without adding external relays.
Panel fit and thermal management
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard 3-pole MCCB footprint for a 63 A frame. It mounts on a DIN rail or directly to a backplate via the screw terminals. Power loss is 6.5 W maximum at rated current, so heat buildup in a sealed enclosure is manageable; you won't need forced ventilation for a single unit. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.