UniGear ZS2 (formerly known as UniSafe 36) is a medium voltage, metal-clad air-insulated switchgear (AIS) suitable for indoor installations. It has a modular design and is built with robust and well-proven components.

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The functional units of the switchgear are guaranteed arc proof in accordance with the Standards, appendix AA, class A accessibility, criteria 1 to 5. All the installation, operation and maintenance operationscan be carried out from the front of the unit. The switchgear and the earthing switches are operated from the front with the door closed. The switchgear can be back to wall installed. Compartments Unit compartments: A-Circuit-breaker compartment; B-Busbar compartment; C-Cable compartment; D-Low voltage compartment; E-Compact gas duct channel Each switchgear unit consists of three power compartments: circuit-breaker [A], busbars [B] and cables [C]; please refer to figure 1. Each unit is fitted with a low voltage compartment [D], where all the auxiliary instruments are housed. Arc-proof switchgear is normally provided with a duct [E] for evacuation of the gases produced by an arc; different types of gas ducts are available.

All the compartments are accessible from the front and maintenance operations can correctly carried out with the switchgear installed up against a wall. The compartments are segregated from each other by metallic partitions. Main busbars The compartment contains the main busbar system connected to the upper isolating contacts of the circuitbreaker by means of branch connections.

The main busbars are made of electrolytic copper. For ratings up to 2500 A, the busbars are flat bars; while for currents between 3150 A and 4000 A, a special D-shape busbar is used.

The busbars are covered with insulating material. There is a single busbar compartment along the whole length of the switchgear up to 31,5 kA, which optionally can be divided into compartments.

For 40/50 kA these bushings are a standard feature. Cable connections The cable compartment contains the branch system for connection of the to the lower contacts of the circuit-breaker.

The feeder connections are made of electrolytic copper and they are flat busbars for the whole range of currents. For 17.5 and 24 kV they are covered with insulating material. Earthing switch Cable compartment can be fitted with an earthing switch for cable earthing. The same device can also be used to earth the busbar system (measurements and bus-tie units). It can also be installed directly on the main busbar system in a dedicated compartment (busbar applications). The earthing switch has short-circuit making capacity. Control of the earthing switch is from the front of the switchgear with manual operation, and, optionally, can also be motor operated.

The position of the earthing switch can be seen from the front of the switchgear by means of a mechanical coupled indicator. Earthing busbar The earthing busbar is made of electrolytic copper and it runs longitudinally throughout the switchgear, thereby guaranteeing maximum personnel and installation safety. Insulating bushings and shutters The insulating bushings in the circuit-breaker compartment contain the contacts for connection of the circuit-breaker with the busbar compartment and cable compartment respectively. The insulating bushings are of single-pole type and are made of epoxy resin. The shutters are metallic and are activated automatically during movement of the circuit-breaker from the racked-out position to the operation position and vice versa.