What this MCCB is and where it fits
The Siemens SENTRON 3VA1163-5EF36-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, configured for line protection — meaning it protects cables and busbars from overload and short-circuit, not motor loads. The TM240 overcurrent release gives a fixed thermal-magnetic trip curve. It carries an undervoltage release (UVR) that drops the breaker when control voltage falls below a threshold, which is useful for emergency-stop circuits or undervoltage protection on a panel feed. Breaking capacity hits 187 kA at 240 V and 121 kA at 415 V, so it handles high-fault-current points like main distribution boards or transformer secondaries.
Ratings that decide fit
The 63 A rating holds flat from 40 °C to 50 °C, then begins to derate: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel ambient runs above 50 °C, the effective continuous current drops — size the breaker for the derated value, not the nameplate 63 A. The 800 V rated insulation voltage (Ui) means it can be used on 480 V or 600 V systems without de-rating for voltage. The front face is IP40, so the breaker is protected against tools and small wires but not against water spray — keep it inside a sealed enclosure if washdown is present.
Panel integration notes
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or screw-mount panel layouts. No auxiliary contact is included; if you need a status feedback signal, order the auxiliary contact block separately. The undervoltage release is wired to a separate control circuit; verify the coil voltage matches your control supply before energizing.