High Voltage Metal-clad Switchboard
with Withdrawable Circuit Breaker

The KHMS-25A is a high voltage metal-clad switchboard commonly used for protection and switching of transformers, motors, generators, capacitors, buses, distribution feeder line and, in general, for protection of any high-voltage power circuit.

KHMS-25A’s high quality and compact design with easy installation at low cost, for new buildings, are important factors for ensuring complete customer satisfaction. We are dedicated to designing, manufacturing and marketing KHMS-25A for the safe and securing customer requirements.


Main characteristics

Main characteristics
Rated voltage (kV)   7.2
Rated voltage (kV) Rated insulation level 20
Lighting impulse withstand voltage 1.2/50 ㎲ (kV peak) 60
Nominal current and maximum short time withstand current Functional unit with circuit breaker 7.2
Short time withstand current lth max. (kA/3s) 25
Rated current lth max. busbar (A) 2000
ln CB (A) 630
Internal arc withstand (kA/1s) 25
Size(H x W x D) 2200x600x1700
  • Metal-clad construction
  • Horizontal isolation, horizontal draw-out
  • Mechanical interlock
  • Removable(drawout) circuit breaker
  • Fully compartmented construction
User Convenience
  • Adaptable solutions tailored to your specific requirements
  • Enhanced safety for your personnel and operations
  • Effective space utilization
  • Significantly reduced maintenance
  • Easy installation
Easy of use
  • Development of dedicated internal ARC handle mounted
  • Do not use a screw bolt
  • Convenient handle operation type


Benefits for you
  • Low installation cost
  • Type approved
  • Compact design
  • Technical support
  • Easy installation
  • Fastest engineering service worldwide

KHMS-25A switchboard with withdrawable circuit breaker meets or exceeds the latest standards of IEC and also provides a superior solution for increased worker safety, enhanced reliability and ease of use.

Tunnel closed architecture of the two ended

1 Tunnel closed at the two ends
  • No external ARC tunnel
  • Optimization of space
  • An outstanding durability to withstand high pressure by internal arc extinguishing
  • Protection of operators in the event of internal arcing

Tunnel closed architecture of the two ended

Internal Arcing Protection(Cubicles subjected to internal arcing tests)

  • In conformity with IEC 62271-200
  • 3 compartments tested (cables, CB, busbar)

Certifications(Certificate of Type tests with IEC 62271-200 standards)

  • Connected position

    1250A Incoming Panel

  • Connected position

    1250A Bus-Tie and
    Bus-Riser Panel

  • Connected position

    2000A Bus-Tie and
    Bus-Riser Panel

  • Connected position

    1250A Internal Arc

  • Connected position

    2000A Internal Arc

High voltage Starter (Auto Transformer)

General Solutions
  • Be equipped with auto transformer(IEC62271-200 TEST COMPLETED)
  • Direct molded Switchboard and possible individual starter
  • Draw-out metal-enclosed switchgear functional units
  • Air insulated cubicle(AIS)

General Solutions

Applied standard IEC62271-200
Rated voltage 7.2kV
Service voltage 6.6kV
Rating (kw) 3000KW
Rated current 400A
Rated frequency 50/60Hz
Internal Arc 25kA/1sec
Rated short-time withstand voltage 25KA/3sec
Rated peak withstand current 65kA/3sec
Degree of protection IP4X
Control voltage DC 110V
Maintenance access Front and Rear type
Size(H x W x D) 2200 x 2400 x 1700


Authorized Certificate

Complies with the following IEC standards
  • IEC 60694 : Common clauses for HV switchgear
  • IEC 62271-200 (60298) : AC metal-enclosed switchgear and
  • controlgear for rated voltages above 1kV and up to and including 52kV
  • IEC 62271-100 (60056) : HV AC circuit-breakers
  • IEC 60470 : HV AC contactors
  • IEC 60265-1 : HV switches
  • IEC 60282-2 : HV fuses
  • IEC 62271-102 (60129) : AC disconnector and earthing switch
  • IEC 60255 : Measurement relay and protection device
  • IEC 60044-1 : Current transformers
  • IEC 60044-2 : Voltage transformers
  • IEC 60044-8 : Electronic current transformers