The enclosure is welded from stainless steel, and all sheet-metal joints feature a waterproof sealing design, achieving an IP55 protection rating.
Optional fully insulated SF6 load switch solution, equipped with touchable shielded T-type cable accessories and surge arresters. Each ring network line can be fitted with a load switch, allowing any branch circuit to be freely disconnected or put into operation without affecting other ring network circuits.
UN3W-12, 24, and 40.5kV outdoor switchgear cabinets (cable tap boxes) are a new type of modular, multi-functional, highly reliable, compact, and maintenance-free switchgear cabinet (cable tap box). They are suitable for power supply lines with voltage levels of 40.5kV and below, and serve the functions of cable tapping, disconnection, control, and protection.
Altitude: ≤5000m (When the operating altitude of the equipment exceeds 2000m, this must be specifically noted);
Ambient temperature: Maximum temperature +50℃, minimum temperature -50℃, average value within 24 hours ≤35℃;
Environmental humidity: Average relative humidity over 24 hours ≤ 95%; average monthly relative humidity ≤ 90%.
Electromagnetic interference: The amplitude of electromagnetic interference induced in the secondary system ≤ 1.6 kV;
Installation environment: The surrounding air contains neither explosive nor corrosive gases, and the installation location is free from frequent, severe vibrations or impacts.
Note: If the operating environment conditions exceed those specified above, please consult our company to discuss custom solutions.
GB/T 3906-2020 3.6kV~40.5kV AC Metal-Enclosed Switchgear and Control Equipment
GB/T11022-2020 — Common Technical Requirements for High-Voltage Switchgear and Control Equipment (IEC 62271-1:2007 MOD)
JB/T10840-2019 3.6 kV ~ 40.5 kV High-Voltage AC Metal-Enclosed Cable Tap Switchgear
GB11033.2-1989 Basic Technical Requirements for Power Cable Accessories Rated 26/35 kV and Below GB/T17467-2020 Prefabricated Substations for High-Voltage/Low-Voltage Applications
Qian Gu Electric is committed to environmental protection. Its products have been certified under the 15014001 international environmental management system and strictly adhere to this standard.
Recycling and Disposal
The design and manufacture of UN3W switchgear (branch boxes) comply with the requirements of the national standard GB/T10840. At the end of the product’s lifecycle, they will be recycled and reused in accordance with relevant standards.
Sustainable development
During the manufacturing process, the UN3W switchgear (branching box) continuously reduces the use of 5F6, and no 5F6 gas is used during installation.
All products are made from 100% recyclable materials.
Provide self-powered relays and devices to avoid additional energy consumption.
| Operating continuity levels defined in GB/T17467 | |||||
| Other high-voltage compartments or functional units remain energized. | LSC 1: Lower service continuity | LSC1 LSC 2 | |||
| LSC 2: Higher Service Continuity | ● | ||||
| Partition between compartments | PI: Insulating partition | PI PM | |||
| PM: Metal Grounding Baffle | ● | ||||
| Insulation level 12 | 24 | 40.5 | |||
| Rated voltage | kV | 12 | 24 | 40.5 | |
| Rated frequency | Hertz | 50 | 50 | 50 | |
|
Rated insulation level |
Power-frequency withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter) | kV | 42 | 65 | 95 |
| Power-frequency withstand voltage (isolated break) | kV | 48 | 79 | 118 | |
| Power-frequency withstand voltage (auxiliary and control circuits) | kV | 2 | 2 | 2 | |
| Lightning impulse withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter) | kV | 75 | 125 | 185 | |
| Lightning Impulse Withstand Voltage (Isolation Break) | kV | 85 | 145 | 215 | |
| Current level 12 | 24 | 40.5 | |||
| Rated current—busbar | A | 630 | 630 | 630 | |
| Rated short-circuit breaking current | kA | 25 | 25 | 25 | |
| Rated short-circuit making current (main switch/grounding switch) | kA | 63/63 | 63/63 | 63/63 | |
| Short-time withstand current and duration (main circuit + earthing switch, earthing connection) | kA/s | 25/17.6 | 25/17.6 | 25/17.6 | |
| Rated peak withstand current (main circuit + earthing switch, earthing connection) | kA | 63/54 | 63/54 | 63/54 | |
| Internal arc fault withstand capability | |||||
| Grade B | B FLR front side and rear | kA | 20 | ||
| Duration | S | 1 | |||
| Enclosure protection class | |||||
|
Enclosure protection conforming to GB/T 4208 standard |
An energized electrical box | IP67 | |||
| Cable Room | IP43 | ||||
| Institutional Room | IP4X | ||||
| Low-pressure room | IP4X | ||||
| Mechanical impact protection rating | |||||
| Grade compliant with GB/T 20138 | IK07 | ||||
| Other features | |||||
| Expected service life | Year | 30 | |||
| Busbar/Grounding busbar (copper bar) | 120 mm² | ||||
