What this 3-pole MCCB delivers on the line side
The Siemens 3VA1063-2ED36-0CH0 is a SENTRON molded case circuit breaker rated 63 A continuous at 40 °C, holding that current all the way to 50 °C before it starts to derate — at 55 °C it's still good for 62 A, and at 70 °C it's 58 A. That's a tight thermal curve for a 3-pole unit, meaning you don't lose much headroom in a warm enclosure. Breaking capacity runs 52.5 kA at 240 V and 32 kA at 415 V, so it handles substantial fault current on a 400 V distribution board. Rated insulation voltage is 800 V, and the max power loss hits 19.8 W — figure that into your enclosure thermal calc if you're packing several breakers in a row.
Built-in auxiliaries and release
This breaker ships with 2 auxiliary switches plus a trip alarm switch (HQ), and an undervoltage release (UVR) is already integrated — no separate add-on module to order. That UVR means the breaker drops out if the control voltage falls below the release threshold, which is useful for emergency-stop circuits or safety isolation where you need the load disconnected on loss of control power. The trip indicator is present, so you get a mechanical flag showing the breaker tripped on fault vs. manually switched off — saves a multimeter check on a dark panel.
Physical fit and panel layout
At 70 mm deep, 76.2 mm wide (standard 3-inch footprint), and 130 mm tall, this MCCB fits a standard DIN-rail or panel-mount cutout without surprises. The 3-pole width matches the common 3-inch modular format, so swapping into an existing SENTRON or third-party busbar system is straightforward.
What it does and where it goes
This is a line-protection MCCB — designed to sit at the incoming feed of a distribution panel or as a branch-circuit protector feeding downstream loads. It's not a motor-protective breaker (no thermal-magnetic curve tuned for motor start), so use it for cable and busbar protection, not for direct motor starting duty.