What this MCCB does on a motor circuit
The Siemens 3VA2163-7MN36-0DL0 is a 3-pole SENTRON molded case circuit breaker rated for motor protection duty. It carries a continuous current of 63 A at 40 °C and delivers a 330 kA interrupting capacity at 240 V, which drops to 242 kA at 415 V and 440 V, then to 187 kA at 500 V, and 52.5 kA at 690 V. That interrupting curve means it can handle high-fault scenarios on a 480 V distribution bus without cascading upstream — a solid fit for a motor control center feeding pumps or conveyors. The built-in ETU350M electronic trip unit gives you adjustable overload and short-circuit protection plus phase failure detection — a common requirement on three-phase motor circuits where a lost phase can burn a winding before the thermal overload catches it. An undervoltage release (UVR) is fitted as standard, so the breaker drops out if line voltage sags below the release threshold. That is useful on machines that must auto-stop on a brownout rather than restart unexpectedly.
Panel fit and auxiliary wiring
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. Auxiliary contact configuration is 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. That gives you two form-C contacts for status feedback to a PLC, plus dedicated alarm contacts that signal a trip event separately — handy for a remote annunciator or safety circuit. Maximum power loss is 75 W at rated current. That is moderate for a 63 A frame; factor it into your enclosure ventilation if the panel is densely packed.
Thermal derating and ambient range
The breaker is rated for 63 A continuously from 40 °C up to 50 °C. Above that it derates: 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 hot, the 63 A nameplate current is only valid up to 50 °C — above that you need to down-rate the load or move up a frame size. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit governs handling and warehousing, not running conditions.