It uses a rising cage clamp termination — the screw pushes a clamp plate down onto the stripped wire, giving a gas-tight connection across the 12-30 AWG range without requiring a ferrule.
The M3 screw has a specified torque of 0.79 Nm (7.0 Lb-In), which means the installer needs a calibrated screwdriver; under-tightening leaves a high-resistance joint, over-tightening strips the brass threads. The green housing is polyamide 6/6, a standard flame-retardant material for inside-enclosure use.
Interlocking Side Feature for Multi-Block Assemblies
The interlocking (side) feature lets you snap multiple 282857-5 blocks together into a longer strip — 10, 15, 20 positions — without needing separate jumper bars for the common rail. The blocks key together mechanically, so the assembly stays aligned during soldering and in service. This is a practical detail for panel builders who need a custom position count from a standard 5-position building block.