What this 63 A MCCB delivers in a panel
The Siemens SENTRON 3VA1163-5EF32-0AC0 is a 3-pole molded case circuit breaker rated for line protection, carrying 63 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It sits in a 76.2 mm wide, 130 mm tall, 70 mm deep footprint — a standard three-module width on DIN rail, so it occupies the same slot as most 63 A frame MCCBs. The interrupting capacity is what sets this part apart: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a bolted fault on a high-capacity transformer secondary without the arc flashing upstream — critical for main or tie-breaker positions where fault current is highest. The 63 A rating holds flat from 40 °C through 50 °C, then derates to 60.48 A at 55 °C and 56.7 A at 70 °C; if your panel ambient pushes past 50 °C, size the load at the derated value, not the nameplate.
What the auxiliary switch complement means for integration
The breaker ships with 2 auxiliary switches configured as HQ (high-quantity) contacts — these are built-in, not field-added. That gives you two independent signal paths for status feedback to a PLC or a panel lamp without needing an external aux block. No undervoltage release, no shunt trip, no ground-fault monitoring module on this variant; those are separate order codes in the 3VA family. The TM240 release is fixed thermal and magnetic — no adjustable trip curve, no electronic trip unit. That makes it a straightforward fit for standard motor branch circuits or feeder protection where you don't need coordination tweaking.
Environmental limits and storage
Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The IP40 front protection means it's sealed against tools and wires larger than 1 mm from the front face, but it's not rated for washdown or outdoor exposure — keep it inside the enclosure. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin.