The Siemens 3VA2110-5HN42-0BA0 is a 4-pole molded case circuit breaker from the 3VA2 series, IEC frame 160, with a 55 kA breaking capacity at 415 V (class M). It's fitted with an ETU350 electronic trip unit configured for LSI protection — long-time (overload), short-time, and instantaneous — with a rated current In of 100 A and an adjustable overload protection range Ir from 40 A to 100 A.
What the ratings mean for the panel
The 55 kA Icu at 415 V is the maximum fault current this breaker can safely interrupt without damage — critical for high-fault installations like large motor control centers or transformer-fed switchboards where available fault current can exceed 25 kA. The ETU350 LSI trip unit gives you adjustable short-time pickup (Isd = 1.5–10 × Ir) and a fixed instantaneous pickup (Ii = 12 × In), so you can coordinate downstream breakers and limit arc-flash energy. The neutral conductor protection is adjustable (OFF, 50%, 100%), which is useful when you're feeding a mix of single-phase and three-phase loads and need to avoid nuisance tripping on unbalanced return current. The nut keeper kit is included — that's a small thing, but it saves time on the panel assembly line.
Deployment context
The 3VA2 frame mounts in standard panel cutouts and accepts plug-in or fixed connections — common in IEC switchgear assemblies, MCCs, and distribution boards. The 4-pole configuration suits three-phase systems with a fully rated neutral, typical in European and Asian 400/415 V networks.