Siemens SENTRON 3VA2340-5JP32-0JH0 — 400 A MCCB for Line Protection
The Siemens SENTRON 3VA2340-5JP32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, designed for line protection in industrial distribution panels. It carries a maximum breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — the SCCR headroom at lower voltages is substantial, meaning this breaker can handle high-fault utility feeds or transformer secondaries without cascading upstream. The 400 A rating holds flat from 40 °C through 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel that runs warm — say 55 °C ambient inside the enclosure — the breaker is good for 375 A continuous, not the full 400 A. That derating curve is the spec to check before committing the BOM line.
Panel Fit and Internal Accessories
Footprint is 138 mm wide by 248 mm tall by 110 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or panel-mount backplates. The 110 mm depth leaves clearance for rear-connected busbars or cable ladders behind the breaker. Factory-fitted with a shunt trip (STL) release and an auxiliary switch block carrying 2 auxiliary switches plus 1 trip alarm switch (HQ). The base switch is order code 3VA2340-5JP32-0AA0. No undervoltage release or ground-fault monitoring is included — those are separate add-on options if the protection scheme requires them.
Operating Conditions and Power Loss
Rated for operation from -25 °C to 70 °C ambient; storage range is -40 °C to 80 °C. Maximum power dissipation at rated current is 96 W — factor that into the enclosure thermal budget if the panel is tightly packed.