The Siemens SENTRON 3VA1040-3ED32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C, using a TM210 thermal-magnetic fixed-release. It carries a 75.6 kA interrupting rating at 240 V, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — so the SCCR headroom at common distribution voltages is substantial, and the 690 V figure confirms it can handle 600 V class systems with margin.
Ratings and what they mean for fit
The 40 A rating holds flat from 40 °C through 50 °C, then derates gradually to 36 A at 70 °C — useful if the breaker sits in a warm enclosure near other heat sources. The TM210 release is thermal-magnetic, fixed, no adjustable trip; the long-time delay is fixed at 10 s at 600% Iu. That makes it a line-protection breaker for feeder or branch circuits where coordination studies assume a fixed curve. Rated insulation voltage is 800 V, so it can be used in 480/277 V and 600 V panels without derating the insulation path. The IP40 front protection means it's sealed against tools and solid objects larger than 1 mm on the face; the rest of the breaker is open to the enclosure environment, so panel IP rating governs the overall assembly. Mechanical endurance is 15 000 operations — typical for a distribution-grade MCCB; not for frequent switching duty, but fine for protection where the breaker operates only on fault or maintenance isolation.
Construction and integration
Width is 76.2 mm (3-inch pitch, fits standard 3-pole MCCB mounting), depth 70 mm, height 130 mm. The auxiliary contact configuration is 1 auxiliary switch + 1 trip alarm switch (HQ type), wired separately from the main power circuit for remote status indication. No undervoltage release, no shunt trip, no ground-fault monitoring — this is a bare thermal-magnetic breaker; add-on accessories would be required for those functions.