MV Switchgear

KYN28-12 Indoor Metal-Clad Withdrawable Switchgear

KYN28-12 metal-clad withdrawable switchgear provides power distribution, circuit control, protection and monitoring for indoor 12 kV systems. A withdrawable circuit-breaker truck and four-compartment construction organise the primary equipment into separate sections for operation and maintenance access.

The listed configuration covers 630 to 3,150 A, with short-circuit breaking options of 25, 31.5 or 40 kA. Overhead incoming and cable incoming or outgoing arrangements support different substation layouts. Protection, metering and cable terminations follow the project single-line diagram.

Technical Specifications

Rated Voltage	12 kV
Rated Frequency	50 Hz
Rated Current	630 ~ 3150 A
Short-Circuit Breaking Current	25 / 31.5 / 40 kA
Power-Frequency Withstand Voltage	42 kV (1 min)
Lightning Impulse Withstand Voltage	75 kV
Breaker Type	Withdrawable vacuum circuit breaker
Enclosure IP Rating	IP4X; IP2X with breaker door open
Standards	GB 3906

Key Features

Withdrawable circuit-breaker truck and four-compartment construction.
IP4X enclosure; IP2X between compartments and with the breaker door open.
Supports overhead incoming and cable incoming/outgoing schemes.
Front access supports wall-adjacent, back-to-back or double-row layouts.

Typical Applications

Power stations
Factory and mining-site substations
Large medium-voltage motors

Installation & Aftercare

Prepare the site, plan routine checks and keep service records.

What needs to be ready before installation?

For the listed configuration, the catalogue specifies indoor ambient −15 to +40 °C and altitude up to 3000 m; declare site conditions when ordering.
Reserve front space for the breaker truck and handling equipment, plus cable bending and termination access.
Control condensation in the switchroom and cable trench; keep the specified pressure-relief route and operating aisles unobstructed.

What should operators check during routine rounds?

Record breaker operations, fault trips and protection alarms; observe fitted moisture-control equipment and external indications during rounds.

What is covered during planned maintenance?

During planned isolation, qualified personnel inspect truck contacts, shutters, interlocks, earthing connections and the breaker mechanism.
After a fault interruption or abnormal mechanism behaviour, assess the breaker before reuse; service timing follows duty and the installed breaker manual.

Customization Options

Define the electrical configuration and the details needed for your site.

Switchboard lineup: Incoming, outgoing, bus-coupler and metering panels to the approved single-line diagram.
Breaker & busbar duty: Select rated current and fault-breaking duty within the published series range.
Protection & measurement: Relay functions, CT/VT ratios, meter requirements and secondary circuit diagrams.
Cable & installation: Cable quantity and size, entry direction, panel interfaces and the required maintenance aisle.
Controls & signalling: Auxiliary supply voltage, local/remote control and requested alarm or communication interfaces.

Project-specific options and accessories are confirmed in the quotation and approved drawings.