Air-insulated switchgear (AIS)
OSZ product advantages:
1. Safety and reliability: integrated medium and low voltage protection with comprehensive interlocks, visualized fault points and high protection rates.
2. Compact Design: Economical cabinet design that saves both space and cost.
3. Convenient operation: Operation and maintenance from the front for flexible installation.
4. Stable performance: Reliable short circuit protection, compatible with heavy loads and harsh environments.
5. Versatile Applications: Suitable for industry, infrastructure, distribution centers and various scenarios.
OSZ Product Information
1. Product introduction
OSZ uses medium voltagedistributiveThe UniGear ZS series of air-insulated equipment 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 part of 0.4–0.69 kV.
The cabinet features a metal cladding, five-compartment dividers, and a fully integrated front panel. The cabinet can be as narrow as 500 mm and is wall-mountable.
The medium-voltage side is equipped with a VD4 vacuum circuit breaker with a full five-point interlocking system and internal arc protection; the low-voltage side implements dual functions: isolation and fast fuse protection, with a visible braking point and a closed door for safe maintenance.
2. Technical parameters (customizable)
Item |
Medium Voltage (UniGear ZS) |
Low voltage (OS switch and fuse box) |
Notes |
Rated voltage |
12 kV/24 kV (AC 50 Hz) |
400V/500V/690V AC; DC optional |
MV customized for each system; LV covers industry standard levels |
Rated current |
Main Bus: 630–4000A; Branch: 630–1250A |
32–1250A (by model) |
The temperature is estimated at 40°C, the temperature increase corresponds to the test 1.1× |
Short circuit resistance |
25–31.5 kA/4 s (12 kV); 31.5 kA/4 s (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 |
Mechanism of operation |
Vacuum circuit breaker VD4, mechanical life ≥30,000 operations |
Manual (standard); Motorized OSM (optional) |
MV can be decommissioned; LV supports remote control |
Pole configuration |
3-pole (optional earthing) |
1/2/3/4-pole, optional neutral pole |
LV is 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 |
Case dimensions |
Width 500/650/800 mm, wall mounted |
Modular built-in housing, front working depth ≤800mm |
MV volume has been reduced by more than 25% compared to traditional |
3. Main features
Closed loop safety of the entire link
MV five-point locking + internal arc protection; LV visible braking point + closed locking + double insulated handle, padlockable. Gradual fault clearance prevents cascading trips, ensuring the safety of personnel and equipment.
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, areasubstationshas been reduced by more than 25%, which reduces 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 mount adjustable for upgrades. Motorized and digital modules are optionally available for remote control and status monitoring.
Durable and weather resistant
The MV VD4 circuit breaker supports 30 interruptions at full capacity; the cabinet is tested for condensation and vibration. The LV OS complies with heavy-duty vehicle category AC23A, is resistant to high temperatures and dust, and is suitable for metallurgy, mining, marine, and harsh environments.
Flexible, full script compatibility
MV - Single/dual busbar and double-layer arrangement optional; LV is compatible with DIN/BS/UL HRC fuses, covering motors, inverters, capacitor compensation and DC circuits, supporting customized expansion.
4. Application scenarios
Industrial power supply core: MV incoming/outgoing for metallurgy, chemistry, mining, ports; LV main switch for inverters/soft starters, suitable for heavy and strong short circuits.
Data Centers & Infrastructure: Dual power distribution for data centers, hospitals, and rail transport, offering compact footprint, high reliability, and fast protection for critical loads.
Commercial and residential buildings: substations in offices, shopping centers, and luxury communities; a narrow 500mm diameter enclosure for tight packaging, and front-facing access reduces operational complexity.
New energy and power storage systems: MV busbar/feeder for PV, wind, ESS plants; LV PCS and auxiliary circuits of converters compatible with AC and DC protection.
Special conditions: offshore platforms, ships, nuclear power plants, high-altitude areas; Certified for seismic, tilt, humidity, and thermal resistance to meet stringent operating conditions.
