High-Current Terminal Block

Application

High-current terminal blocks are used at the power inlet and main distribution points of large control panels and distribution boards:

• Main panel incoming feed — connection of incoming mains cable (35–185 mm²) to panel busbars or main breaker
• Motor control center busbars — horizontal busbar feed distribution to vertical MCC sections
• Large motor branch circuits — direct connection of 90–250 kW motor supply cables to contactor and overload terminals
• Generator paralleling panels — main incoming terminal for generator output cables before the paralleling breaker
• Transformer secondary terminals — LV winding output connection in dry-type and oil transformer secondary cabinets
• Solar inverter DC input — main PV array cable termination at inverter DC input terminal block (up to 1,000 V DC)
• Battery energy storage systems — main DC bus cable connection between battery racks and the inverter/BMS

Advantage

• High current on standard DIN rail — carries up to 400 A without busbars or specialized enclosures — keeps panel design simple and uniform
• Silver-plated contacts — silver plating maintains low contact resistance over years of thermal cycling, preventing hot spots at high current density
• 1,000 V AC and DC rated — single product family covers both AC industrial panels and DC solar/battery systems
• Knife-disconnect option — optional built-in isolating blade allows single-pole isolation of main cables during maintenance without fully de-energizing the panel
• Hex-socket bolt clamping — high-torque hex socket bolt (30 N·m on largest size) provides far better clamping reliability than standard slotted or cross-head screws on large conductors
• Batch current tested — every production batch is tested at 2× rated current for 1 hour — thermal and contact resistance verified before shipment