ETFZX Low-Voltage Enclosed Busbar System

Model and meaning

Product Description

The ETFZX series of enclosed busbars system is specifically designed for low-voltage cable branch box systems, providing an integrated solution for cable branching, connection, power distribution, and transmission. It meets the demands of modern power grids for high efficiency and compact design, in accordance with GB/T 7251.1-2023.

The ETFZX enclosed busbar system features a high-temperature-resistant, flame-retardant engineering plastic housing that fully encloses the branch box busbars, ensuring complete phase-to-phase isolation between switches. It offers high protection ratings and excellent safety performance. This busbar system supports both top-entry and bottom-entry installation configurations. In particular, the use of integrated busbar technology reduces the system’s footprint, minimizes busbar connections, and lowers busbar internal resistance, offering the advantages of low temperature rise and a compact structure. This allows the cable branch box to perform at its best, ensuring the stability and safety of power transmission.

Product Features

Core Structural Design (Safety and Reliability)

• Fully Enclosed Protection System: Busbars are encased in V-1 grade ffame-retardant,material (self-extinguishing), with a continuous temperature resistance of ≥ 120° C. The protection rating is upgraded to IP33 (protection against solid foreign objects ≥ 2.5 mm), isolating external dust from affecting phase-to-phase insulation.

• Modular Assembly Design: Branch circuits can be conffgured as needed (standard modules: 4–7 circuits).

• Compact Integrated Structure: Utilizes a monolithic busbar structure, reducing busbar connection points by over 60% and lowering contact resistance by 30%–40%, resulting in low temperature rise (temperature rise ≤ 70K) and making it suitable for space-constrained environments.

• Phase-to-Phase Safety Isolation: Achieves complete isolation between phases, eliminating the risk of phase-to-phase short circuits.

• Built-in zero-arcing device: Features a zero-arcing function to ensure operational safety and reduce the risk of interphase breakdown.

• Fence-style three-dimensional heat dissipation channels: Optimizes heat dissipation pathways to ensure the busbar’s continuous operating temperature rise remains ≤ 60K

 Installation and Maintenance (Efffcient and Convenient)

• All-scenario adaptability: Supports both top-entry and bottom-entry cable routing to accommodate various cable branch box layouts.

• Integrated modules: Modular, all-in-one installation for efffciency and convenience.

Materials and Performance (Long Service Life, Low Losses)

• Conductive System: Features T2 copper plates with tin-plated or silver-plated surfaces to reduce contact resistance (contact resistance ≤ 10 μΩ) and ensure a temperature rise of ≤ 70 K (under full load).

• Industrial-Grade Protective Housing: Impact-resistant, corrosion-resistant, and flame-retardant (V-1 rating), suitable for harsh environments such as high temperatures and high humidity.

Electrical Energy Transmission Efffciency

• Wide Current Carrying Capacity: Supports a current range of 400A to 800A, compatible with low-voltage three-phase/four-wire systems (0.4 kV), and meets the needs of various power consumption scenarios.

• High-Efficiency Power Transmission: Power transmission efficiency ≥ 99%. Through an integrated busbar design and low-impedance conductive busbars (contact resistance ≤ 10 μΩ), energy loss is signiffcantly reduced, optimizing power transmission performance.

Operational Stability and Temperature Control

• Low Temperature Rise Guarantee: A combination of a louvered exhaust channel and a high-temperature-resistant housing ensures efffcient heat dissipation, keeping the temperature rise at ≤ 70K even when the busway is operating at full load, thereby preventing insulation aging caused by overheating.

• Safety Protection Mechanism: A built-in zero-arc device ensures operational safety and reduces the risk of interphase breakdown.

Overall Dimension Diagram (mm)

ETFZX-630-(4-7)-3	ETFZX-630-(4-7)-4

ETFZX-630-(4-5)-3T	ETFZX-630-(4-7)-4S