What the ratings mean
The 393570015: The 12 A per circuit rating is governed by the tin plating and the cage clamp's contact interface — the nickel-plated clamp body provides mechanical bite on the conductor, while the tin on the contact surface keeps first-mate resistance low. For a 16-28 AWG wire range this current ceiling is comfortable; the limiting factor in practice is thermal rise in the housing material, not the contact itself at rated current.
Where it is used
Eurostyle 39357 blocks appear in control cabinet DIN-rail sub-assemblies, PLC input/output modules, and industrial instrumentation front panels where a dense, board-referenced wire entry point is needed. The through-hole mount solders directly to the PCB and the horizontal orientation routes wire entry parallel to the board surface — a profile that fits recessed panel layouts without adding standoff height.
Field dressing note
The M3 screw at 0.31 Nm is the torque target for the cage clamp. Under-torque leaves the conductor loosely gripped; over-torque deforms the clamp spring on repeated re-entry. For field service the polyamide housing tolerates the operating temperature range, but long-term thermal cycling in a sealed enclosure will follow the -40°C to 105°C envelope — the nylon material does not add margin beyond that.