MCCB for line protection with ground-fault monitoring
The Siemens SENTRON 3VA2063-6KQ36-0AA0 is a 3-pole molded case circuit breaker designed for line protection, rated 63 A continuous current at 40 °C and carrying a full-scale value of 63 A. Its interrupting capacity reaches 242 kA at 240 V and 187 kA at 415 V — figures that cover most industrial fault-current scenarios downstream of a transformer. The breaker includes a ground-fault monitoring function using summation current formation on the L-conductor, which detects leakage without a separate core-balance transformer. Rated insulation voltage is 800 V, and maximum power loss sits at 5.4 W, so thermal management in a crowded panel is straightforward.
Interrupting capacity across voltage levels
This MCCB's interrupting capacity is not a single number — it varies with system voltage. At 240 V it clears 242 kA; at 415 V and 440 V it holds at 187 kA; at 500 V it drops to 121 kA; and at 690 V it is rated 3 kA. The 690 V figure is low enough that this breaker should not be the sole short-circuit protection on a 690 V line unless the available fault current is confirmed below that threshold. The 63 A continuous rating is derated across the full temperature range from 40 °C to 70 °C without reduction — the same 63 A holds at 70 °C, which is unusual and simplifies panel sizing in warm environments.
Panel fit and mounting dimensions
The breaker measures 86 mm depth, 105 mm width, and 181 mm height. It mounts on a DIN rail or can be screw-fixed to a backplate. The 105 mm width is standard for a 3-pole MCCB in this frame size, so it drops into existing SENTRON or third-party panel layouts without re-drilling. The 86 mm depth leaves clearance for rear-connected busbars or a cable duct behind the mounting plane.
Communication and monitoring capability
This variant includes a communication function and an other measurement function, which typically means it can interface with a bus system (PROFIBUS or PROFINET via a communication module) for remote trip indication, current metering, and parameterization. The ground-fault monitoring version uses summation current formation on the L-conductor, so it detects residual currents without a separate neutral CT — useful on 3-phase loads where a neutral is not run. No undervoltage release or trip indicator is fitted on this order code; those are separate accessories.