63 A MCCB with 187 kA interrupting — what that means for your panel
The Siemens SENTRON 3VA1110-4EE36-0AF0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) across the 40–50 °C ambient range, with only a 2 A derating by 65 °C. That 63 A holds steady through most panel environments — you don't lose headroom until the cabinet runs hot. The interrupting rating is the standout: 187 kA at 240 V, 121 kA at 415 V, still 76 kA at 440 V. That puts it in high-fault territory — suitable for main or tie breakers in large distribution boards where available fault current is serious. At 500 V and 690 V it drops to 17 kA, still enough for most motor branch circuits at those voltages. The TM220 thermal-magnetic trip unit gives fixed thermal and magnetic settings — no adjustment dials, which means less to go wrong and no risk of mis-setting in the field. The auxiliary contact package is 1 NO/NC auxiliary switch plus 1 separate trip-alarm switch (HQ type), so you get both status and fault indication without adding external relays.
Panel fit — 130 mm tall, 3 in wide, IP40 front
At 130 mm height and 3-inch width, this breaker fits the standard SENTRON 3VA footprint. Front IP40 means it's protected against tools and wires >1 mm — fine for enclosed panels, but not for washdown environments. Rated insulation voltage is 800 V (Ui), so it's comfortable in 480/277 V and 600 V systems with margin. Storage range is -40 to 80 °C; operating range is -25 to 70 °C. The 15 000 mechanical endurance cycles (latching) cover most industrial switching duty without premature wear.