What this MCCB does in your panel
The Siemens 3VA2340-6JQ42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 400 A continuous current, designed for line protection in distribution panels. Its 242 kA interrupting capacity at 240 V (187 kA at 415 V) gives you headroom for high-fault installations — think transformer secondaries or large motor control centers where SCCR requirements push past typical 65 kA breakers.
Temperature derating and real-world current
Full 400 A rating holds up to 50 °C ambient. Above that, it derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel runs hot — near a furnace line or in a sealed enclosure — size the breaker for the actual operating temperature, not the nameplate 400 A.
Breaking capacity by voltage level
Interrupting rating drops as voltage climbs: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. At 690 V the 7.5 kA figure is the limiting factor — verify your available fault current at that voltage before specifying.
Dimensions and panel fit
Mounts in a 184 mm wide, 248 mm tall, 110 mm deep footprint. Four-pole frame means it occupies the width of two standard single-pole MCCB positions. Check gland-plate clearance for the 110 mm depth — it fits most 200 mm deep enclosures but verify against your backpanel layout.
Ground-fault and communications
Includes summation current ground-fault monitoring on L+N conductors. Communication function is built in — no external module needed for basic signaling. Undervoltage release is not fitted on this variant. Trip indicator is absent, so fault diagnosis relies on the communication channel or external annunciation.
Lifecycle and sourcing posture
Listed as current production — no end-of-life notice. Sourced through independent distribution; quoted to order against an RFQ. Volume pricing and availability confirmed at quote time. No official second-source cross-reference, but the 5SQ2670-2YA06 series shares the same SENTRON platform and similar ratings — verify footprint and accessory compatibility before substituting.