What this breaker is and what the ratings mean
The Siemens 3VA1040-4ED42-0AA0-ZD00 is a 4-pole IEC frame 100 circuit breaker from the 3VA1 series, built for line protection in distribution panels. Its headline rating is a 36 kA breaking capacity at 415 V (class S), which means it can safely interrupt fault currents up to that level without upstream cascading — critical for selective coordination in a plant's main or sub-distribution board. The thermal-magnetic trip unit is a TM210 with fixed overload protection set at Ir = 40 A and fixed short-circuit protection at Ii = 10 × In (400 A). That fixed setting simplifies ordering: no adjustment dials to mis-set on site, but also no field flexibility — the breaker is locked to its 40 A rating, so the load must match exactly. The N conductor is unprotected (solid neutral), and the breaker includes a nut keeper kit — a detail that speeds DIN-rail or mounting-plate installation in OEM panel builds, especially for the DC Power OEM channel in China this variant targets.
Lifecycle and sourcing posture
For a BOM line that requires this exact variant — 40 A, 4-pole, TM210, N unprotected, with the nut keeper kit — the part is sourced and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time through independent distribution.
Where it fits in the panel
As an IEC frame 100 breaker, it mounts on a standard DIN rail or directly to a mounting plate. The 4-pole format occupies four module widths; plan for adequate heat dissipation if grouping multiple breakers in a sealed enclosure — the TM210 trip curve assumes free-air ambient at 40 °C.