Siemens SENTRON 3VA2163-5KQ42-0AA0 — 63 A MCCB for Line Protection
The Siemens SENTRON 3VA2163-5KQ42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, designed specifically for line protection in distribution panels and switchboards. With a breaking capacity of 187 kA at 240 V and 121 kA at 415 V, this MCCB handles high-fault scenarios common in industrial mains and sub-distribution — the 187 kA rating at 240 V is the highest short-circuit current it can safely interrupt without upstream coordination. The overload setting is adjustable from 95 A to 756 A, giving the integrator flexibility to match the breaker to the actual load without swapping the frame.
Breaking Capacity Across Voltages
Breaking capacity drops with system voltage: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The 690 V figure is low — this breaker is not intended for 690 V main feeds; it's sized for 240–500 V distribution where the fault current is within its capability.
Thermal Performance and Derating
The 63 A continuous rating holds flat from 40 °C to 70 °C — no derating needed across that range, which simplifies panel layout in warm enclosures. Operating temperature range is -25 °C to +70 °C; storage range extends from -40 °C to +80 °C, covering most indoor and sheltered outdoor installations.
Communication and Monitoring
This MCCB includes a communication function and other measurement capability, plus ground-fault monitoring via summation current formation on L + N conductors — useful for remote status and leakage detection without an external relay.