Medium Voltage Switchgear

JST offers a wide range of medium voltage switchgear options suitable for supporting customers in industrial, commercial, and utility installations involving generators, motors, feeder circuits, transmission, and distribution lines. The portfolio includes solutions for secondary and primary distribution.

Why JST?

  • Premiere customer service
  • Detailed engineering and technical support
  • Short lead times
  • Fast response
  • Flexible outdoor solutions

Air Insulated Switchgear - AIS

JST’s metal-clad switchgear provides safe, reliable switching and fault protection. Manufactured in beautiful Lake Mary, FL.

JST Power Equipment type J100CLAD™ is an IEEE rated, non-arc-resistant, metal-clad switchgear product line with Type J3Mag vacuum circuit breakers. 

Product ratings and highlights are listed on below.

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IMG_3497
J100Clad_IMG_3477_Fixed_V3
  • Fully compliant to the latest standards (IEEE C37.20.2-2015 and ANSI C37.55-2020) for metal-clad switchgear construction
  • UL certified
  • Modular design and construction
  • Galvanized steel construction
  • Two-high construction
  • Top and bottom cable or bus duct entry
  • ISO 9001 certified manufacturing facilities
  • PT/Fuse compartment closed door racking
  • Closed-door racking
  • Front accessible circuit breaker operating mechanism for ease of maintenance
  • Single phase operation
  • Magnetically actuated breaker
  • Independent pole actuators
  • Longer life, lower operation costs
  • Safer design, easier access for service
  • (9)a (9)b Auxiliary Contacts
  • Having few moving parts eliminates lubrication requirements
  • Direct drive of push rods eliminates torque in breaker
  • Fully compliant to IEEE C37.04-2018 and IEEE C37.09-2018
  • Fast reclose duty qualified
  • Consistent operating time over life of unit
  • Chain driven mechanism
  • Standard five-year warranty
  • Improve SAIFI/SAIDI scores

Gas Insulated Switchgear - GIS

Medium voltage gas-insulated switchgear offering consists of fixed-mounted vacuum circuit breakers that are connected to the main bus through three-position switches.

JST’s Gas-insulated medium voltage switchgear is tested against the following standards:

IEC 62271-200, IEC 62271-103, IEC 62271-105, IEC 62271-102, IEC 62271-100, IEC 480, GB11023, GB12022 and GB11033

ParametersUnitJ20XJ10XJ10NJ10SJ10SI
C-GISRMUNitrogen RMUSolid-Insulated RMUSemi-Insulated RMU
Insulating MediumSF6SF6SF6N2Solid ResinSF6 and Air
Lightning Impulse Withstand (BIL)kV15015095/125959595
Rated VoltagekVup to 40.5kVup to 40.5kVup to 24kVup to 12kVup to 12kVup to 12kV
Rated CurrentAup to 2500Aup to 1250Aup to 630Aup to 630Aup to 630Aup to 630A
Rated Short circuit breaking currentkAup to 31.5kAup to 25kAup to 25kAup to 20kAup to 25kAup to 20kA
Dimensions (WxDxH)mm600-800 x 1600 x 2400450 x 1000 x 1700350 x 800 x 1450440 x 800 x 1450440 x 898 x 1800375 x 915 x 1800
in24"-32" x 63" x 94.5"14" x 32" x 57"14" x 32" x 57"17.5" x 32" x 57"17.5" x 35.5" x 71"15" x 36" x 71"
ApplicationsPrimary distribution, Step-up power station, Tramcar, Transformer, SubstationWind energy, Power Distribution of large industrial and mining enterprisesSecondary power distributionSecondary Power Distribution sub-section post, Power Distribution room of newly built housing estatePower Distribution room of newly built housing estate

C-GIS 

A robust medium voltage solution utilizing SG6 gas as an insulating medium.  C-GIS is offered in a wide range of ratings designed for use in primary distribution applications.  We offer a variety of panel configurations at the following ratings:

  • 40.5kV / 1,250-2,500A / 31.5kA
  • 12-24kV / 1,250-2,500A / 25-31.5kA

Ring Main Unit (SF6)

Ring Main Unit is a medium voltage solution utilizing SF6 gas as an insulating medium.  RMU is offered in a range of ratings designed for use on secondary distribution applications.  We offer a variety of panel configurations to suit all the required needs at the following ratings:

  • 40.5kV / 630A / 25kA
  • 12-24kV / 630-1,250A / 20-25kA

Ring Main Unit (Nitrogen)

An eco-friendly ring main unit used on medium voltage applications utilizing N2 gas as an insulating medium.  For use in lighter duty secondary distribution applications, we offer a variety of panel designs at the standard ratings:

  • 12kV / 630A / 20kA

Ring Main Unit (Solid-Insulated)

For use on medium voltage applications utilizing an epoxy resin composite as an insulating medium.  For use on secondary distribution applications, we offer a variety of panel designs at the standard ratings:

  • 12kV / 630A / 25kA

Ring Main Unit (Semi-Insulating)

Medium voltage applications using SF6 gas and Air as an insulating medium.  For use on lighter duty secondary distribution applications, we offer a variety of panel designs at the standard ratings:

  • 12kV / 630A / 20kA

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