The Siemens 3VA1140-6EF42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker with a class H breaking capacity — meaning it can interrupt fault currents up to 70 kA at 415 V without self-destructing, which is the rating that governs selectivity coordination in a distribution board. That 70 kA Icu puts it in the high-capacity tier for IEC panels; it handles the worst-case bolted fault on a transformer-fed bus without needing an upstream current-limiting fuse. The TM240 thermal-magnetic trip unit is fixed at In=40 A with an adjustable overload band Ir=28…40 A and a short-circuit magnetic pickup Ii adjustable from 5 to 10 times In.
What the key ratings mean for fit
The 70 kA Icu at 415 V is the headline number that decides whether this breaker coordinates with downstream devices in a selective system. The TM240 trip unit is a thermal-magnetic design — the thermal bimetal handles overloads (Ir adjustable 28-40 A), the magnetic solenoid handles short-circuits (Ii adjustable 5-10 x In). The 4-pole configuration with unprotected N means the neutral pole is a switched-only pole — it opens and closes with the phases but has no overcurrent sensing. That is correct for a 3-phase + N system where the neutral is sized for unbalanced current only, not for a 4-wire feeder that must protect the neutral against a phase-to-neutral fault. If your code requires neutral protection, you need a 4-pole breaker with a protected neutral (typically a 3VA1 with a different order-code suffix).
Deployment context
Mounts in a standard IEC distribution board or motor control center on a DIN rail or bolted to a mounting plate via the frame's integral fixing points.