What the ratings mean for fit
The Siemens SENTRON 3VA1163-5EF36-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 63 A continuously at 40 °C ambient without derating. The TM240 thermal-magnetic release handles overload and short-circuit trips; the thermal element tracks load current, the magnetic element clears fast on high faults. Breaking capacity is the headline number here: 187 kA at 240 V AC, dropping to 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That means this MCCB can interrupt fault currents up to 187 kA at the lower voltage — critical for high-fault-capacity panels near large transformers or utility feeds. At 690 V the 17 kA figure still covers most industrial motor branch circuits. Rated insulation voltage is 800 V, so the internal clearances and creepage are sized for 690 V systems with margin. The breaker is rated for operation from -25 °C to 70 °C ambient, with storage from -40 °C to 80 °C.
Thermal derating and power loss
The 63 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. Maximum power loss is 17.3 W per pole — worth accounting for in a tightly packed panel with limited airflow.
Auxiliary switch configuration
Factory-fitted with one auxiliary switch and one trip alarm switch (HP type). The auxiliary signals the open/closed state of the breaker; the trip alarm signals that the breaker tripped on fault, not manual operation. No undervoltage release or ground-fault monitoring version is included — those would be separate add-on modules.