Siemens 3VA2340-5KP32-0DH0 — SENTRON MCCB, 400 A, Line Protection with Communication
The Siemens SENTRON 3VA2340-5KP32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with an adjustable thermal-magnetic trip unit covering 600 A to 4000 A — meaning the same breaker body can be dialled in for a 600 A feeder or a 4000 A main, depending on the load study. At 240 V it interrupts 187 kA; at 415 V / 440 V it holds 121 kA, and at 690 V the interrupting rating drops to 7.5 kA, so the available fault current at the installation point must be verified against the voltage-specific curve. The line-protection design targets main incomers and large feeders, not branch motor circuits. Built-in communication and other measurement functions allow integration into a plant monitoring system — the exact protocol is set by the plug-in communication module (not included in this base order code).
Temperature Derating & Continuous Current
The 400 A rating holds up to 50 °C ambient. Above that the breaker must be derated: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C (–). If the panel ambient runs hot — say a non-climate-controlled enclosure near a furnace line — use the 55 °C or 60 °C column to size the load. The maximum operating temperature is 70 °C; storage range is -40 °C to 80 °C (–).
Auxiliary Switches & Undervoltage Release
This variant ships with two auxiliary switches plus one trip alarm switch (HQ type) — enough for remote status and alarm annunciation without an external relay. It also includes an undervoltage release (UVR) that trips the breaker when control voltage drops below a threshold, standard for safety interlocks or emergency-stop chains. The basic switch assembly is order code 3VA2340-5KP32-0AA0; the UVR and aux switches are factory-integrated, not field-addable on this SKU.
Dimensions & Panel Fit
Footprint: 138 mm wide × 248 mm high × 110 mm deep (–). That 110 mm depth (4.33 in) is shallow for a 400 A frame — fits in a 250 mm deep enclosure with room for rear cable lugs. Width of 138 mm (5.43 in) means a 3-pole unit occupies about 5.5 module spaces on a DIN rail; plan the backpanel layout accordingly.