What this MCCB is and what the ratings mean
The Siemens 3VA2140-5MP32-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, with a continuous current rating of 40 A that holds flat from 40 °C up to 70 °C — no derating needed across that range, which simplifies panel thermal budgeting. Its interrupting ratings climb to 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — the 187 kA figure at 240 V means it can clear a fault at that level without upstream coordination issues, which matters for high-capacity transformer-fed panels. The adjustable trip class (10A, 10/10E, 20/20E, 30/30E) lets you match the overload curve to the motor start profile — a 10E setting for quick-start pumps, a 30E for high-inertia loads like centrifuges. Built-in phase failure detection and a communication function allow this breaker to report status back to a PLC or BMS, which saves a trip to the panel when you need to confirm the breaker hasn't opened on a lost phase.
Sourcing and lifecycle
The 86 mm depth, 105 mm width, and 181 mm height (–) fit the standard 3VA panel footprint; if you're swapping in a panel originally built around the 5SQ2370-2YA05 series, check the mounting hole pattern and bus-bar spacing — the 3VA uses a different lug arrangement and may require adapter brackets.
Panel integration notes
Rated insulation voltage of 800 V covers 480Y/277 V and 600 V systems with headroom; the 1.6 W maximum power loss is low enough that adjacent breakers in a multi-unit lineup won't need forced-air cooling. Operating temperature range of -25 °C to 70 °C and storage range of -40 °C to 80 °C suit unheated warehouses and outdoor enclosures in temperate climates. No undervoltage release, no ground-fault monitoring, and no trip indicator — this is a bare motor-protection breaker; add external modules if those functions are required.