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Simplified design and complete factory assembly and testing mean the Series 2000 Circuit-Switcher can be relied upon to function properly day in and day out. And S&C’s comprehensive, easy-to-follow inspection recommendations, keyed to typical transformer inspection schedules, ensure the Circuit-Switcher continues to perform properly. The Series 2000 Circuit-Switcher’s reliability is backed by S&C’s 5-year warranty!

Series 2000 Circuit-Switchers provide these important features and benefits:

  • A wide variety of mounting configurations. There’s a model to suit every substation layout and profile.
  • Pre-engineered modular construction plus complete factory-assembly and testing. Dramatically reduces installation time. No costly, time-consuming field adjustments are needed.
  • Superior reliability and economy. Series 2000 Circuit-Switcher’s simple, straightforward design means fewer parts — and lower initial and operating costs.
  • Hermetically sealed, no-maintenance SF6-gas-filled interrupters. Single-gap puffer-type interrupters maintain dielectric ratings when open.
  • Optional remote-gas-density monitor. Includes dual-level low-gas-density alarms and system status contact.

(On mobile, swipe left for remaining ratings information.)

Voltage and Continuous, Short-Time, and Fault-Closing Current Ratings

kVAmperes, RMS
Nom.MaxBILCont.Short-TimeFault-Closing,
Duty-Cycle,
One-Time
Mom.1-Second
69 72.5 350 1200/2000 64 000 40 000 40 000
115 121 550 1200/2000 64 000 40 000 40 000
138 145 650 1200/2000 64 000 40 000 40 000
161 169 750 1200 64 000 40 000 40 000
230 242 900 1200 64 000 40 000 40 000


Interrupting Current Ratings for Transformer Switching and Protection

ClassQualificationsMaximum Amperes,
Interrupting RMS
Symmetrical
Parallel Switching 1200/2000
Load Dropping 1200/2000
Fault Interrupting Primary Faults 69 kV through 138 kV 25 000/40 000
161 kV and 230 kV 20 000
Secondary Faults 4000
Internal faults — see both primary and secondary faults, above


Interrupting Current Ratings for Line Switching and Protection

ClassQualificationsMaximum Amperes,
Interrupting RMS
Symmetrical
Load Splitting (Parallel
or Loop Switching)
1200/2000
Load Dropping 1200/2000
Line Dropping 69 kV through 138 kV 400
161 kV 320


Interrupting Current Ratings for Cable Switching and Protection

ClassQualificationsMaximum Amperes,
Interrupting RMS
Symmetrical
Load Splitting (Parallel
or Loop Switching)
1200/2000
Load Dropping 1200/2000
Cable Dropping
(Charging Current)
69 kV through 138 kV 400
161 kV 320
Fault Interrupting 69 kV through 138 kV 25 000
161 kV 20 000


Interrupting Current Ratings for Single Shunt Capacitor Bank Switching and Protection

ClassQualificationsMaximum Amperes,
Interrupting RMS
Symmetrical
Bank Current Switching Grounded capacitor banks applied on solidly grounded systems only, through 138 kV 400
Ungrounded capacitor banks through 115 kV 400
Fault Interrupting 25 000


Interrupting Current Ratings for Shunt Reactor Switching and Protection

ClassQualificationsMaximum Amperes,
Interrupting RMS
Symmetrical
Reactor Current Switching Grounded reactors applied on solidly grounded systems only, through 138 kV 600
Ungrounded reactors, 69 kV only 600
Fault Interrupting 25 000


For Series Reactor Switching, contact your nearest S&C Sales Office.

For more detailed ratings and application information, see S&C Publication 716-31.

Series 2000 Model 2010 — Horizontal Interrupters and Vertical-Break Disconnect


The Model 2010 is ideal for low-profile substations where an integral disconnect is required. The disconnect is operated in sequence with the interrupters.


Series 2000 Model 2020 — Vertical Interrupters and Side-Break Disconnect


For substations where space is minimal and an integral disconnect is required, Model 2020 is an excellent solution. With its vertical-interrupter design, this model provides a low-cost means to include an integral disconnect because it uses shorter pole-unit bases and three fewer station-post insulators.


Series 2000 Model 2030 — Vertical Interrupters, Without Disconnect


The Model 2030’s vertical-interrupter “candlestick-style” design ensures it will fit in the tightest of spaces. In this application, a Model 2030 was “shoehorned” into an existing substation where the distance between the transformer radiator and the footings for the non-loadbreak disconnect structure measured only seven feet.


Series 2000 Model 2040 — Horizontal Interrupters, Without Disconnect


Model 2040 is the solution for low-profile substations where a separate disconnect is used.

Series 2000 Circuit-Switcher interrupters are driven by a single, stored-energy mechanism located at ground level. The operator directly drives the interrupters open and closed through a simple, high-speed power train. The power train leads from the top of the operator, through a horizontal interphase linkage enclosed in the steel-sheathed box-type base, to reciprocating-action insulated operating rods that pass through the hollow insulating support columns. The mechanism features instantaneous trip-free capability: if the Circuit-Switcher is inadvertently closed into a fault sensed by user-furnished relays, the mechanism will trip immediately.

Other features of the operator include:

  • Weatherproof, dustproof enclosure with front and side access doors.
  • Trip and close push buttons.
  • Non-reset electrical operation counter.
  • Charged and discharged indicators.
  • Manual-trip lever.
  • Optional position-indicating lamps provide local indication of trip-coil continuity as well as open/closed status of interrupters.

A Resource for Selecting a Substation Transformer Protective Device

One criterion in selecting a distribution substation transformer protective device is its ability to protect the transformer from secondary-side limited faults . . . or “through-faults.” These faults are difficult to detect by the overcurrent relay of the line-terminal circuit breaker, because the magnitude of the fault current is relatively low — being limited by the impedance of the transformer. These faults are a challenge to clear as well, because of their high transient recovery voltage.

Click here to use the Through-Fault Current Calculator.

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