Outdoor Substation Breaker


The First Medium Voltage Single-Phase Capable Distribution Circuit Breaker

In today’s challenging market, the OD3Mag™ Substation Breaker offers improved system reliability, faster restoration times and better customer satisfaction.

OD3Mag Design Advantages
  • Position Indicators for each pole
  • Operation counter can be viewed from outside
  • Minimum enclosure penetrations prevent water intrusion
  • The welded roof design transfers weight of bushings and CTs to the cabinet side panels thereby reducing roof deflection and reducing water leakage issues
  • Innovative gasket system ensures sealing around bushing entrance points under moments of flex from external forces
  • Stainless steel door hanger on high voltage cabinet creates automatic grounding point and increases safety during removal and replacement of the door
  • Optional Forklift provisions allow more convenient handling and installation of the breaker on site
  • Helps utilities improve their SAIDI and SAIFI scores
  • Robust cabinet design requires no visual inspections outside of 5 year recommended maintenance cycle
Advantages of Magnetic Actuation
  • No lubrication or regular maintenance requirements on the actuator
  • Direct drive of push rods eliminates structural torquing of break drive components
  • Consistent operating time of the mechanism across entire rated temperature range and min/max operating voltages of the breaker
  • Rare earth magnets lose <1 % of flux density over time, requiring no adjustments throughout breaker lifetime
  • Actuator controls are self-monitoring and report breaker status at all times
  • Quieter actuation compared to traditional spring-spring mechanism
JST ODB Freestanding

OD3Mag™ Outdoor Substation Breaker

The OD3Mag™ is the first MV Substation Breaker that allows the choice of 1-phase or 3-phase operation.

This feature allows you the performance and ratings of a circuit breaker and the functionality of a recloser. By tripping individual phases in distribution systems, utilities are able to improve their SAIDI and SAIFI scores and enhance the resiliency of their network.

Standard Features
  • Up to 15KV, 2000A, 31.5kA
  • Magnetically Actuated Breaker
  • Single-Phase Capability with Independent Pole Actuators
  • Extra Creep Bushings
  • Overhead Lift Standard
  • Padlock Provision
  • Lift-out Breaker for Easier Upgrades/Repairs
  • LV Control Instrument Panel Swing Door
  • Adjustable Leg Heights
  • Minimal Number of Enclosure Penetrations Prevents Leaks
  • Lift Off Doors
Optional Features
  • Single-Phase or 3-Phase Operation and Lockout
  • Instrumental Door Provision for Relay Controls
  • Forklift Lifting Provision
  • Lift Out Breaker Feature
  • Left or Right Door Swing
  • Manual Trip Lever and Mechanical Lockout (69 Switch)
  • CT and Ragowski Coil Options
    • Up To 2 Sets Per Bushing
    • Single and Multi Ratio CTs Available
Maximum voltage 15.5 kV RMS
Continuous current 1250A / 2000A RMS
Number of poles 3
Voltage range factor K 1
Power frequency 60 Hz
Power Frequency Withstand (dry/wet) 50 kV / 45 kV
BIL 125 kV
Standard operating duty O-0.3s-CO-15s-CO
Short-circuit current 31.5 kA RMS
Peak withstand current 82 kA Peak
Duration of short-circuit 2 s
Short-circuit making current 82 kA
Symmetrical interrupting capability 31.5 kA RMS
Asymmetrical interrupting capability 43 kA RMS
Interrupting time 3 cycle
Transient recovery voltage 34.2 kV
Control voltage 48Vdc, 125Vdc, 120Vac
Class S2
Maximum voltage 15.5 kV RMS
Number of poles 3
Rated over headline current 100 A
Rated capacitor bank current (back-to-back) 600 A
Rated peak inrush 6 kA
Rated inrush frequency 1.2 kHz
Class C2
Operation 10,000 ops
Maintenance Period 10,000 ops
Rated Minimum Operational Temperature -40° F (-40˚ C)
Rated Maximum Operational Temperature 131˚ F (50° C)
Rated IP IP55, IK10
Enclosure Rating NEMA 4
JST Pad Mount

OD3Mag™ Dimensional Info

With the OD3Mag™ breaker, JST combines field proven magnetic actuation with independent pole operation to achieve the first ever single-phase capable substation circuit breaker.

The OD3Mag™ Breaker is designed to help improve utility SAIDI and SAIFI scores. With magnetic actuation, the breaker will reduce O&M requirements, improve performance, and provide consistent, reliable operation across it’s lifetime.

Lifting Provisions
  • 1.06” diameter holes
  • 4 lifting locations points welded to the roof
  • 15.5kV, 125kV BIL, Porcelain
  • Extra Creep: 25.2″ Top, 18.3″ Bottom
  • 1250A: 1 1/4″ – 12 threaded stud
  • 2000A: 2 1/4″ – 12 threaded stud
NEMA 2-Hole Ground Pads
  • 6 exterior grounding locations
  • Roof: Welded, Aluminum
  • Enclosure: Welded, Stainless Steel
Instrument Panel (Optional)
  • Swing open from left or right side

  • 34.25” x 28.00”

We Will Never Force A Solution. We Will Engineer The Answer.

We continually work to create products with higher efficiencies and better value. Each year we make substantial investments in the research & development of new products and manufacturing techniques.

We regularly innovate on behalf of our customers, collaborating with them to find solutions to their specific challenges.

Get Started

Premier Customer Service

Detailed Engineering & Technical Support

Industry Leading Lead Times

Fast Response

Flexible Solutions

Dedicated Project Managers


Meet The Experts

“The OD3MagTM breaker is the most exciting apparatus to enter the Smart Grid ecosystem in years.  The interchangeability between single phase and three phase operating modes makes this a no-brainer for utilities making efforts to modernize their distribution network all the way back to the substation.”

Erin B.


“Our quality is your peace of mind. This promise extends from the initial delivery to when our products are in service. Feel free to send us any after sales service request you may have. We are here to help.”

David D.


“Engineered to value – this is reflected in the concise level of detail of our proposals and in the quality of our finished product.”

Juan E.


“We offer expert and end-to-end-support from the moment we receive your request until your switchgear is delivered.”

Rebeca C.


“Our switchgear is designed and tested according to industry standards, while reflecting best practices and learnings we have gathered as a manufacturer.”

Valeria G.


“Are you looking for a quality response on your transformer and switchgear needs? JST is here for you: with our team of experts, proven track record and industry insight.”

Jonathan W.


Have questions? Contact our team.

Contact Form

Office Headquarters

30 Skyline Drive
Lake Mary, FL 32746



Contact Us

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