What this MCCB is and what it does
The Siemens SENTRON 3VA2163-5JQ32-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a full-scale current of 63 A with an adjustable thermal-magnetic trip that can be set anywhere from 16 A to 63 A — so you dial it to match the load, not the other way around. The trip indicator gives you a clear visual when it's opened on fault, which saves chasing ghosts on a panel. Breaking capacity is the headline number that tells you whether this breaker can handle a worst-case short where it's installed. At 240 V it's rated 187 kA, at 415 V and 440 V it holds at 121 kA, at 500 V it's 75.6 kA, and at 690 V it drops to 3.7 kA. That 187 kA figure at 240 V means it can interrupt a fault current up to that level without welding its contacts or bursting — critical for high-fault panels near large transformers or utility feeds. Thermal performance is flat across the board: it carries the full 63 A continuously from 40 °C all the way up to 70 °C ambient. No derating needed in a hot panel or near a motor starter — that's a real advantage when you're packing breakers into a crowded enclosure.
Integration and panel fit
The 3VA2163-5JQ32-0BL0 measures 105 mm wide, 181 mm tall, and 86 mm deep. That 86 mm depth is the dimension you care about for enclosure depth clearance — it's shallow enough for most standard wall-mount panels, but verify your deadfront clearance if you're using a deep rotary handle. It includes an undervoltage release (UVR) that will trip the breaker if control voltage drops below a set threshold — useful for preventing automatic restart after a power dip. The auxiliary switch complement is 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch, giving you feedback to a PLC or annunciator panel. A communication function is built in, so this breaker can talk to a higher-level system for monitoring and remote trip — no separate comm module needed for basic integration.