What this breaker is and what the ratings mean
The Siemens 3VA2163-5KP32-0DH0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 63 A continuous current (Iu) across a 3-pole configuration, fitted with an ETU850 electronic trip unit for line protection duty. The 187 kA breaking capacity at 240 V is the headline number, but the real-world fit depends on the voltage on your bus: at 415 V and 440 V it still interrupts 121 kA, dropping to 79 kA at 500 V and 4.25 kA at 690 V. That 4.25 kA at 690 V is the limiting case — if your system runs 690 V with available fault current above that, this breaker is not the right choice. The ETU850 is a programmable electronic trip with communication capability, so it integrates into a monitored distribution system rather than being a passive thermal-magnetic device.
Thermal derating and panel integration
The 63 A rating holds flat from 40 °C through 50 °C ambient — no derating needed in a typical 40 °C panel. At 55 °C it drops to 60.6 A, at 60 °C to 58.3 A, and at 70 °C to 53.6 A. If your enclosure runs hot (stacked drives, poor airflow), size the upstream conductor and downstream load for the derated value at your actual ambient. The breaker measures 105 mm wide × 181 mm high × 86 mm deep — standard 3-pole MCCB footprint for a 160 A frame, so it fits existing SENTRON mounting bases and busbar systems without panel rework.
Auxiliaries and releases
This variant ships with an undervoltage release (UVR) built in — the supplied basic switch is 3VA2163-5KP32-0AA0 and the integrated auxiliary trip is 3VA9608-0BB25. The auxiliary contact block provides 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), giving status feedback for PLC or SCADA monitoring. Maximum power loss is 6.5 W, negligible for panel thermal budgeting. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.