What the ratings mean for fit
The 3VA1110-4EF42-0AA0-ZD00 is a Siemens 3VA1 molded-case circuit breaker on the IEC frame 160 platform, rated breaking capacity class S with an Icu of 36 kA at 415 V AC. That 36 kA interrupting rating at 415 V means it can safely clear a fault up to that level without upstream coordination issues in a 400/415 V distribution panel — the class S designation places it between standard and high-breaking variants in the 3VA1 family. It is a 4-pole unit with the neutral conductor unprotected, configured for line protection with a TM240 thermal-magnetic trip unit. The overload protection (Ir) is adjustable from 70 A to 100 A, and the short-circuit protection (Ii) is fixed at 5 to 10 times In — so at the 100 A setting, instantaneous trip is between 500 A and 1000 A. This makes it a fit for feeder circuits or downstream sub-distribution where you need a 100 A rated breaker with adjustable thermal pickup and a wide magnetic band. The suffix ZD00 indicates a special version that includes a nut keeper kit for DC Power OEM applications in China. That detail matters for BOM traceability: if your panel is built to a Chinese OEM spec requiring that hardware, the standard 3VA1110-4EF42-0AA0 will not match the kit content.
Deployment context
The 3VA1 frame 160 is a panel-mount MCCB designed for DIN-rail or screw-mount installation in low-voltage switchgear and distribution boards. The 4-pole configuration with unprotected neutral suits TN or TT systems where the neutral is not switched. The nut keeper kit included with this ZD00 variant simplifies assembly for OEMs building DC power distribution equipment — the kit keeps the mounting hardware captive during panel wiring.