Box-Type AC Metal-Enclosed Switchgear | FZN-12/630 Load Switch

Overview

This box-type AC metal-enclosed switchgear is built around the FZN-12/630 type vacuum load switch. The ring main unit equipped with this switch meets the corresponding technical requirements of the FZN-12/630 vacuum load switch.

Two cabinet schemes are available so the switchgear can serve either end of a feeder. The ingoing cabinet scheme provides one FZN-12/630 vacuum load switch with an isolating knife and an optional grounding knife, all mounted on a single frame and interlocked with each other, so the operations for connecting the busbar, isolation and earthing can be carried out in sequence.

The outgoing cabinet scheme provides one FZN-12/630 vacuum load switch together with a fuse with striker, which acts as a disconnecting switch, and a grounding knife, which also allows three-position operation. Current and voltage transformers and YH series surge arresters can be installed flexibly inside the cabinet, and in some arrangements the metering cabinet can be omitted.

Key Features

• FZN-12/630 vacuum load switch — the main circuit of both the ingoing and outgoing cabinet schemes is built around one FZN-12/630 type vacuum load switch.
• Single-frame interlocked assembly — in the ingoing scheme the load switch, isolating knife and optional grounding knife are mounted on a single frame and interlocked with each other.
• Busbar, isolation and earthing operations — the ingoing cabinet arrangement allows busbar connection, isolation and earthing to be performed.
• Three-position operation in the outgoing cabinet — the outgoing scheme combines the load switch, a fuse with striker acting as a disconnecting switch, and a grounding knife for three-position operation.
• Flexible CT and PT installation — current and voltage transformers can be installed flexibly inside the cabinet, and in some arrangements the metering cabinet can be omitted.
• YH series surge arresters — YH series surge arresters can be fitted in the outgoing cabinet.
• Insulated protective baffles and mechanical interlocking — both ingoing and outgoing cabinets are equipped with insulated protective baffles linked to the grounding switch, with mechanical interlocking between each switch, the baffle and the cabinet door.

Technical Specifications

Applications

• Ring main distribution networks — incoming and outgoing feeder positions in medium voltage ring networks.
• Industrial facilities — medium voltage distribution inside factories and industrial sites.
• Residential and commercial distribution — distribution substations serving housing and commercial developments.
• Compact switchrooms — installations where a box-type arrangement is preferred over a full switchgear line-up.

Installation Conditions

• The switchgear is designed for indoor installation in a distribution room or switchroom.
• The outgoing cabinet can be arranged without a separate metering cabinet in some configurations, which reduces the space required.
• Insulated protective baffles are linked to the grounding switch, so the earthing position must be established correctly during commissioning for the interlocking to work as intended.
• Mechanical interlocking is provided between each switch, the baffle and the cabinet door, so the operating sequence must follow the interlock logic.

How to Select

• Whether an ingoing cabinet scheme or an outgoing cabinet scheme is required.
• Whether the optional grounding knife is needed in the ingoing cabinet.
• Whether a metering cabinet is required, or whether it can be omitted.
• Current transformer and voltage transformer functions required inside the cabinet.
• Whether YH series surge arresters are required in the outgoing cabinet.
• Rated voltage, rated current and short-circuit withstand level of the network.

FAQ

Request Quote