ESS TERMINAL CX 300A RED

ESS TERMINAL CX 300A RED

The ESS TERMINAL CX 300A RED is a high-current panel terminal designed for battery energy-storage and DC power-distribution assemblies where a clearly identified positive connection point is required. The CX-300A designation identifies the 300A current class, while the red insulated housing provides an immediate polarity cue during battery-cabinet, inverter, UPS and ESS wiring. This type of terminal is commonly used as the interface between an internal busbar or cable lug and an external high-current cable connection, helping keep heavy conductors mechanically organized at an enclosure or panel boundary.

A high-current terminal is only one part of the complete power path. Real system performance depends on conductor cross-section, lug quality, crimping, mating surface condition, bolt torque, busbar design, airflow and operating temperature. A nominal 300A terminal rating should therefore be treated as a component rating rather than a guarantee that every installation can carry 300A continuously. The entire cable-to-busbar path must be engineered for the intended continuous current, peak current and duty cycle.

The CX-300A red terminal is identified as a 300A high-current power terminal with a copper-based conductive connection and an insulated polymer housing. The red housing is conventionally used on the positive side of a DC battery system, helping technicians distinguish polarity during assembly and service. Panel-style mounting allows the terminal to be fixed to an ESS enclosure, battery cabinet or DC distribution panel so the external cable connection remains accessible while the internal conductor is protected inside the equipment.

Contact resistance is especially important at high current. Even a small increase in resistance can create significant heat at hundreds of amps. Cable lugs should therefore be correctly sized, clean, flat and securely tightened. Where a busbar is connected behind the panel, its material, thickness and contact area must also match the current requirement. Protective covers, spacing and enclosure clearances should prevent accidental contact with adjacent conductive parts.

Select this terminal by matching the required current class, polarity identification, mating hardware, cable-lug size, panel thickness and available mounting space. Do not assume that all CX-style terminals use identical hole spacing, stud dimensions or mating components. For new builds, confirm the mechanical drawing or measure the physical stock before cutting a panel. For replacement work, compare the original terminal footprint and internal connection method as well as the 300A label.

Applications

• Battery energy-storage system cabinets and wall-mounted ESS assemblies.

• Solar inverter battery connections and high-current DC distribution panels.

• Li-ion and LiFePO4 battery racks requiring an external positive power terminal.

• UPS, backup-power and industrial DC systems with heavy cable connections.

• EV battery, charger and workshop test systems where a robust panel feedthrough is required.

Installation Guide

Isolate all DC sources before installation. Mount the terminal on a rigid, non-conductive or correctly insulated panel section, maintaining adequate clearance from the opposite-polarity terminal and grounded metalwork. Use a correctly sized cable lug or busbar, tighten the connection with the appropriate hardware, and protect against loosening from vibration. After assembly, check polarity, inspect the connection for exposed conductive areas and verify that the terminal remains cool during a controlled commissioning test before applying the full system load.

Why Choose ARB Accessories?

ARB Accessories focuses on lithium-battery, EV, energy-storage and battery-pack assembly components for professional workshops, OEM projects, service businesses and system integrators. The catalog brings together battery-management electronics, active balancers, connectors, insulation materials, enclosures, wiring, terminals, fuses, testing equipment and assembly tools. Buying related components from one specialist source can simplify specification matching and procurement. Final suitability should always be confirmed against the exact electrical design, mechanical layout, equipment interface and safety requirements of the application before installation.