What this breaker is and what the ratings mean
The Siemens 3VA1116-5ED42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker from the 3VA1 series, configured for line protection with a fixed thermal-magnetic trip (TM210, FTFM). The headline rating is Icu=55kA at 415 V — that is the ultimate short-circuit breaking capacity, meaning it safely interrupts faults up to 55,000 A without welding contacts or cascading upstream. That class M rating puts it in the middle of the 3VA1 breaking capacity range, suitable for industrial distribution panels where fault currents are high but not extreme. The continuous current rating is In=160A with overload protection fixed at Ir=160A and short-circuit pickup fixed at Ii=10 x In (1600 A instantaneous). The N conductor is unprotected — a deliberate choice for certain OEM lineups where the neutral is not expected to carry fault current. This variant includes a nut keeper kit and is specified for DC Power OEM applications in China.
Where it goes in the panel
This breaker mounts on a DIN rail or directly to a backplate in an industrial enclosure. The 4-pole configuration (3 phases + unprotected neutral) is common in three-phase distribution boards feeding downstream sub-distribution or directly powering equipment. The fixed thermal-magnetic trip means no adjustment dials — set it and forget it, which suits OEM builds where the load is known and consistent. The nut keeper kit simplifies panel wiring by retaining hardware during assembly. Rated for 55 kA at 415 V, it needs upstream coordination to ensure the fault current at its line side does not exceed that figure — standard selectivity practice for any MCCB.