Air-insulated switchgear (AIS)
Advantages of the OSZ product:
1. Safety and reliability: integrated medium and low voltage protection with comprehensive interlocks, visualized fault points, and high protection ratings.
2. Compact design: cost-effective cabinet design that saves both space and expenses.
3. Convenient operation: front-side operation and maintenance for flexible installation.
4. Stable performance: reliable short-circuit protection, compatible with heavy loads and harsh conditions.
5. Versatile applications: suitable for industry, infrastructure, distribution centers, and various scenarios.
Product Information of OSZ
1. Product Introduction
OSZ uses medium-voltagedistributionair-insulated UniGear ZS series equipment as the foundation and seamlessly integrates the PowerLine OS switch-fuse, forming a complete power distribution and protection system from 12–24 kV medium voltage to the low-voltage section of 0.4–0.69 kV.
The enclosure features metal cladding, five-compartment partitions, and a fully front-access system. The cabinet width can be as narrow as 500 mm and supports wall mounting.
The medium-voltage side is equipped with a VD4 vacuum circuit breaker with a full five-system interlock and internal arc protection; the low-voltage OS implements a dual function: isolation and fast fuse protection, with a visible break point and closed door to ensure maintenance safety.
2. Technical Parameters (Customizable)
Item |
Medium Voltage (UniGear ZS) |
Low Voltage (OS Switch and Fuse Unit) |
Remarks |
Rated voltage |
12 kV/24 kV (AC 50 Hz) |
400V/500V/690V AC; Optional DC |
MV, customized for each system; LV covers industrial standard levels |
Rated current |
Main bus: 630–4000A; Branch: 630–1250A |
32–1250A (depending on model) |
Temperature rated at 40°C, temperature rise complies with 1.1× test |
Short-circuit withstand |
25–31.5 kA/4s (12 kV); 31.5 kA/4s (24 kV) |
Up to 100 kA with HRC fuses |
MV: short-time; LV: breaking capacity |
Internal arc |
IAC AFLR 31.5kA/1s |
IP20 fuse cover, enclosure-level protection |
MV: internal arc protection; LV: touch protection |
Operating mechanism |
VD4 vacuum circuit breaker, mechanical service life ≥30,000 operations |
Manual (standard); Motorized OSM (optional) |
MV can be taken out of service; LV supports remote control |
Pole configuration |
3-pole (optional earthing switch) |
1/2/3/4-pole, optional neutral pole |
LV suitable for single-phase and three-phase with N-line |
Standards |
IEC 62271-200, GB 3906, DL 404 |
IEC 60947-3, GB 14048.3, UL/CSA |
Global compliance, full CE/UL certifications |
Cabinet dimensions |
Width 500/650/800 mm, wall-mounted installation |
Modular built-in enclosure, front operation depth ≤800 mm |
MV volume reduced by over 25% compared to traditional |
3. Main Features
Full-link closed safety loop
MV five-fold interlock + internal arc protection; LV visible break point + closed interlock + double-insulated handle, padlockable. Graded fault clearing prevents cascading trips, ensuring personnel and equipment safety.
Ultra-compact and space-saving
ZS enclosure width from 500 mm; Compact modular OS design, dual-cable connection reduces busbar usage. Full front operation requires no rear access, areasubstationsReduced by more than 25%, lowering construction costs.
Efficient installation and operation
High interchangeability of the removable MV trolley; LV fuse replacement from the front, telescopic shaft without cutting. Top/side mounting adjustable for upgrades. Motorized and digital modules optionally available for remote control and condition monitoring.
Durable and weather-resistant
The MV VD4 circuit breaker supports 30 full-power interruptions; the cabinet passes condensation and vibration tests. The LV OS meets heavy-duty AC23A category, resistant to high temperatures and dust, suitable for metallurgy, mining, marine, and harsh environments.
Flexible full scenario compatibility
MV — single/dual busbar and double-layer layout optional; LV compatible with DIN/BS/UL HRC fuses, covering motors, inverters, capacitor compensation, and DC circuits, supporting custom expansion.
4. Application scenarios
Industrial core power supply: MV incoming/feeder for metallurgy, chemicals, mining, ports; LV main switch for inverters/soft starters, suitable for heavy and strong short circuits.
Data centers and infrastructure: dual power distribution for data centers, hospitals, railway transportation, compact space with high reliability and fast protection of critical loads.
Commercial and residential buildings: substations in offices, shopping malls, high-end communities; Narrow cabinet with 500 mm width for dense layout, front access reduces operational complexity.
New energy storage and energy systems: MV bus/feeder for photovoltaic, wind, ESS stations; LV PCS and auxiliary converter circuits, compatible with AC and DC protection.
Special conditions: offshore platforms, ships, nuclear power plants, high-altitude areas; Certified for seismic resistance, tilt, humidity, and thermal stability to comply with stringent operating conditions.
