The Siemens 3VA1140-5ED42-0AA0-ZD00 is a 3VA1 IEC frame 160 molded-case circuit breaker with a class M breaking capacity of Icu=55kA at 415 V, configured as a 4-pole unit. It carries a TM210 thermal-magnetic trip block set for fixed overload protection at Ir=40 A and fixed short-circuit protection at Ii=10 x In, with the N conductor left unprotected. The ZD00 suffix signals a variant configured with a nut keeper kit for DC Power OEM applications in China.
Breaking capacity and coordination
The 55 kA Icu at 415 V places this breaker in the medium-high interrupting range for IEC applications — the class M designation means it can clear a bolted fault at that level without welding its contacts or venting an arc. In a distribution panel, that SCCR headroom allows it to be installed upstream of downstream breakers with lower interrupting ratings, provided the selectivity tables in the Siemens selectivity manual are followed. For a 40 A feeder on a 400 V line, the margin between the fault rating and the load current is wide enough that coordination with a downstream 25 A or 32 A MCB is straightforward.