The Siemens SENTRON 3VA2140-7KQ46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in distribution panels. Its 330 kA interrupting capacity at 240 V means it can safely clear a fault of that magnitude without the arc flashing over to adjacent buswork — critical for high-fault locations like transformer secondaries or large motor control centers. The 4-pole configuration handles three-phase plus neutral, common in IT or TN-S systems where the neutral needs overcurrent protection.
Breaking capacity across voltages
This MCCB delivers 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V is typical of air-break designs — the arc extinguishes less efficiently at higher voltage. For a 690 V line, the 3.7 kA rating still covers most motor branch circuits, but verify your available fault current before specifying.
Thermal performance and ground-fault monitoring
Rated current holds flat at 40 A from 40 °C through 70 °C ambient — no derating needed in a warm enclosure. The ground-fault monitoring uses summation current formation on L+N conductors, meaning it measures the vector sum of phase and neutral currents to detect leakage. Communication function is onboard, so it can report trip events and status to a PLC or BMS over the panel bus.
Panel fit and dimensions
At 181 mm high, 140 mm wide, and 86 mm deep, it mounts on a DIN rail or directly to a backplate via the screw terminals. The 86 mm depth leaves clearance for wiring gutters in a standard 200 mm deep enclosure. Four poles mean the breaker occupies the full width of a 4-module DIN-rail space — plan your busbar takeoffs accordingly.