ENGINEERED POWER DISTRIBUTION · CHINA

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MV Switchgear

HJ-MCS-12 Series Metal-Clad Switchgear

Name: HJ-MCS-12 Series Metal-Clad Switchgear
Brand: HJATIS

The HJ-MCS-12 Series is a 12 kV air-insulated, metal-clad withdrawable switchgear for 3-phase AC 50/60 Hz systems. It is designed for power receiving, distribution, and grid protection in power plants, substations, heavy industry, mining, petrochemical, commercial buildings, data centers, and renewable energy integration.

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HJATIS

PUBLISHED PRODUCT DATA

Catalogue ratings and configurations.

The project data sheet should state the selected rating, options and site conditions.

Technical Specifications

Technical Specifications
System & Power Parameters
Rated Voltage (Ur)	12 kV
Rated Frequency (fr)	50 Hz / 60 Hz
Rated Main Busbar Current	630A / 1250A / 1600A / 2000A / 2500A / 3150A / (Custom up to 4000A with forced cooling)
Withstand & Protection Ratings
Short-Circuit Breaking Current	20kA / 25kA / 31.5kA / 40kA / (Custom up to 50kA)
Short-Time Withstand Current (4s)	20kA / 25kA / 31.5kA / 40kA / (Custom up to 50kA)
Peak Withstand Current (Ip)	50kA / 63kA / 80kA / 100kA / (Custom up to 125kA)
Power Frequency Withstand	42 kV (1 min)
Lightning Impulse Withstand (BIL)	75 kV
Protection Degree	Enclosure IP4X / Compartment IP2X / (Custom IP5X available)

CONFIGURATION

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ParameterCatalogue indicationProject input required

01Rated Voltage12 kVSystem voltage

02Rated Frequency50 Hz / 60 HzSystem frequency

03Rated Main Busbar Current630A / 1250A / 1600A / 2000A / 2500A / 3150A / (Custom up to 4000A with forced cooling)Required busbar current

04Short-Circuit Breaking Current20kA / 25kA / 31.5kA / 40kA / (Custom up to 50kA)Required breaking capacity

05Protection DegreeEnclosure IP4X / Compartment IP2X / (Custom IP5X available)Required IP rating

STANDARDS & REPORTS

Standards and product documents.

Applicable references: GB/T 3906 and IEC 62271-200. Ask for the edition and reports covering the model offered; a standard number alone does not confirm product compliance.

PRODUCT DOCUMENTSProduct documents available

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Compare GB and IEC references ↗Your StandardBridge inputs and results are not attached to a sales enquiry automatically.

APPLICATIONS

Questions for your application.

Utility and industrial distribution

What are the feeder rating and fault level at the installation point? Send the protection scheme with the enquiry.

Renewable-energy collection networks

Will the device switch cables, transformers or other plant loads? State the switching duty and required control signals.

TECHNICAL LIBRARY

Product documents

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All documents

User manualRev B · September 2026

HJ-MCS-12 — User manual

Reported model KYN28A-12/1250-31.5

12 kV · 1250 A · 31.5 kA

Installation, operation, maintenance and transport for the stated model and ratings.

43 pages·8.6 MB·English

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Test report2017

HJ-MCS-12 — Test report

Reported model KYN28A-12/1250-31.5

12 kV / 1250 A / 31.5 kA

Report no.: 17Q2392-S
Test basis: GB 3906-2006 · GB 1984-2014

Type tests for the stated configuration. No internal-arc classification is established by this report.

60 pages·46.5 MB·English guide + Chinese original

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The English guide is prepared by HJATIS; it is not a laboratory translation or an IEC certificate. Results apply to the tested sample and configuration. The original report and its stated standard editions govern.

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