Parameters Code Segment Parameter English Description Explanation 266 Series / Type 3-Level Feed-Through Terminal Block Indicates a modular terminal with three independent connection levels (layers): input, an intermediate potential distribution layer, and output. HSHHS Function / Configuration With Test Sockets and Bridging Points Defines the electrical layout. H = connection point with a test socket/jack. S = connection point for screw-type bridging/jumpering. The sequence H-S-H-H-S describes a complex configuration for potential distribution and measurement, commonly used in Current Transformer (CT) circuits or control circuits requiring isolation and test points. B7 Marking / Color Write-on Marking Strip, Color Code (e.g., Black/Grey) B = equipped with a write-on marking area. 7 = specific color (often black or dark grey) for housing or marker. EZL Connection Technology Spring Clamp Connection (EZ), Side Entry EZ = ABB's "Easy" spring-loaded clamp, tool-operated. L = Lateral (side) cable entry direction. ST Conductor Type For Solid or Stranded Conductors Suitable for both solid core and stranded wires without needing wire-end ferrules (unless specified by local regulations). B Mounting Snap-on Mounting for 35mm Top-Hat DIN Rail Can be snapped directly onto a standard EN 60715 35mm x 7.5mm or 35mm x 15mm DIN rail.