Double-Level Terminal Block

Application

Double-level terminal blocks are the standard choice wherever panel height is fixed but wiring density must increase:

• Compact PLC and DCS marshalling panels — doubling I/O wiring density in the same rail length — critical for retrofits where the enclosure cannot be enlarged
• Machine tool control cabinets — organizing tool-change, coolant, and axis wiring in a compact servo cabinet
• Building automation field controllers — cramped DIN rail space on flush-mounted BMS controllers where a full-size panel is not possible
• Process analyzer cabinets — separating sample-line signal wiring from power wiring in a double-level arrangement on a single rail
• Aerospace ground support equipment — space-constrained avionics test rigs requiring high I/O density
• Elevator and lift control panels — safety circuit and drive wiring in the limited panel space of a traction machine room
• Rail vehicle wiring bays — high-density wiring in rolling stock underframe junction boxes

Advantage

• Double wiring density, same rail length — fits twice as many circuits in a given panel width — the most cost-effective way to address panel space constraints
• Full galvanic isolation between levels — upper and lower circuits share no electrical connection — can carry different voltages (e.g., 24 V DC upper, 230 V AC lower) on the same block
• Individual test points per level — each level has its own 4 mm test socket — both circuits are testable without disconnecting any wiring
• Individual labelling per level — upper and lower positions accept separate marker tags — IEC-compliant individual circuit documentation at half the space
• No cross-wiring risk — physical separation of upper and lower entries prevents the most common dense-panel wiring error — wrong-level insertion
• Spring-cage option for lower levels — lower-level spring-cage eliminates the need to reach past upper-level wiring to tighten a screw — significant time saving in dense panels