What this MCCB is and what it carries
The Siemens 3VA1163-3EF36-0CA0 is a SENTRON molded case circuit breaker (MCCB) built for line protection. It's a 3-pole unit rated for 63 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release — that's the fixed trip curve for overload and short-circuit protection, not an electronic adjustable one. The part also ships with an undervoltage release (UVR) built in, so if your control voltage drops, this breaker trips without a separate shunt-trip module to wire in.
Interrupting capacity — what it clears and where
This MCCB's interrupting capacity varies with system voltage, and that's the number you need for your fault study. At 240 V it clears 75.6 kA; at 415 V it's rated 52.5 kA; at 440 V it drops to 32 kA; and at 500 V or 690 V it holds at 11.9 kA. That means it's suited for high-fault-capacity 240 V panels — think large commercial or light industrial services — but you'll need to check your available fault current at the higher voltages. The rated insulation voltage is 800 V, so the breaker's internal clearance is fine for 690 V systems, but the interrupting rating is what governs the installation.
Thermal performance and panel fit
Current rating holds flat at 63 A from 40 °C up through 50 °C — no derating needed in a warm enclosure at those temps. At 55 °C it's 62 A, at 60 °C it's 61 A, and at 65 °C it's 60 A, with the floor at 58 A at 70 °C. Ambient operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Physical footprint: 130 mm tall, 76.2 mm wide, 70 mm deep — that's a standard MCCB form factor for a 3-pole 63 A frame. The 19.8 W maximum power loss at rated load is heat you'll need to account for in a dense panel, but it's not unusual for this class.