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.

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Why JST?

  • Premier Customer Service
  • Detailed Engineering and Technical Support
  • Short Lead Times
  • Fast Response
  • Flexible Outdoor Solutions
  • Dedicated Project Managers

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Air Insulated Switchgear – AIS

JST’s medium voltage air-insulated switchgear provides safe, reliable switching and fault protection. JST’s air-insulated switchgear is proudly manufactured in 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 below:

Features
  • 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
Advantages
  • Built in Racking Mechanism
  • Built into cubicle vs on truck (lighter weight breaker)
  • Allows for easy addition of electric racking solution
  • Easier replacement or movement of breakers
  • TOC Switch Aux Contacts
  • 8/16 pole contacts
  • Positive Pole indication
  • Tilt out CPT/PT Compartment (with closed or racking)
Benefits
  • 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
Value Basis
  • Longer life/higher reliability
  • Removes failure points from truck assembly
  • Upgrades are easy to retrofit
  • Higher up times for your customers
  • System design flexibility
  • Safer & easier inspection leads to lower maintenance costs and improved personnel safety

Gas-Insulated Switchgear – GIS

JST’s 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 medium voltage gas-insulated switchgear is tested according to the following standards:

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

Parameters Unit J20X J10X J10X J10N J10S J10SI
C-GIS RMU Nitrogen RMU Solid-Insulated RMU Semi-Insulated RMU
Insulating Medium SF6 SF6 SF6 N2 Solid Resin SF6 and Air
Lightning Impulse Withstand (BIL) kV 150 150 95/125 95 95 95
Rated Voltage kV up to 40.5kV up to 40.5kV up to 24kV up to 12kV up to 12kV up to 12kV
Rated Current A up to 2500A up to 1250A up to 630A up to 630A up to 630A up to 630A
Rated Short circuit breaking current kA up to 31.5kA up to 25kA up to 25kA up to 20kA up to 25kA up to 20kA
Dimensions (WxDxH) mm 600-800 x 1600 x 2400 450 x 1000 x 1700 350 x 800 x 1450 440 x 800 x 1450 440 x 898 x 1800 375 x 915 x 1800
in 24″-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″
Applications Primary distribution, Step-up power station, Tramcar, Transformer, Substation Wind energy, Power Distribution of large industrial and mining enterprises Secondary power distribution Secondary Power Distribution sub-section post, Power Distribution room of newly built housing estate Power Distribution room of newly built housing estate

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:

  • 5kV / 1,250-2,500A / 31.5kA
  • 12-24kV / 1,250-2,500A / 25-31.5kA

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:

  • 5kV / 630A / 25kA
  • 12-24kV / 630-1,250A / 20-25kA

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

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

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

Company

Phone Number

844-631-9046 (Toll Free)
+1-407-632-4050