Medium-voltage vacuum roll-in replacement circuit breakers

Medium-voltage replacement circuit breakers

5-38 kV
  • 250-1,500 MVA

  • 1,200-3,000 A

Find out how much you could save with Siemens replacement circuit breakers

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Vacuum roll-in replacement circuit breakers provide a cost effective way to upgrade your system capabilities while saving you from costly maintenance and lost productivity.

Whether your original air-magnetic switchgear was made by Allis-Chalmers, Westinghouse, GE, Federal Pacific, ITE, McGraw Edison, or another manufacturer, we will assist you to evaluate the Siemens vacuum replacement, retrofit, or retrofill option that best meets your needs.

 

Why replacement circuit breakers?

  • Increased reliability and performance

  • Reduced operating and maintenance expenditures

  • Reduced downtime and minimal changeover time during power switchgear modification or conversion

  • Preserved investment in existing cubicles

  • Improved employee and environmental safety.

 

Why Siemens?

  • Superior performance and longer service life

  • Standard 3AH operator on all Siemens replacement medium-voltage distribution and outdoor vacuum circuit breakers

  • MOC-Saver™ provides reliable operation of existing MOC system (applicable models)

  • Extensive replacement circuit breaker and retrofit experience with more than 800 projects since 1983

  • Nuclear 1E rated

  • Testing per ANSI, IEEE C37.59 - 2007

  • Full range of service capabilities by skilled factory-trained engineers and technicians.

 

Watch the videos below to learn more about medium-voltage replacement circuit breakers.

The following circuit breakers are available as pre-engineered designs.  Other manufacturers, models, and ratings can be engineered by Siemens.

Live-tank circuit breaker support capabilities

Siemens has replacement circuit breaker designs for most Allis-Chalmers designs including the MA, MB, MC, MCV (Siemens MSV), FA, FB, FC, FCV (FSV), and AM (AMR). Siemens also has many designs for the GE Magneblast, Westinghouse DH/DHP, ITE HV/HK, Federal Pacific DST2, and McGraw Edison PSD.

Manufacturer
Original model
Siemens replacement model
kV
Ratings MVA
AMP
Allis-Chalmers
AM
4.76
150
1200, 2000
Allis-Chalmers
AM
4.76
250
1200, 2000
Allis-Chalmers
MB/MBV
8.25
250
1200, 2000
Allis-Chalmers
MB/MBV
8.25
500
1200, 2000
Allis-Chalmers
MC/MCV
15
150
1200
Allis-Chalmers
MC/MCV
15
250
1200, 2000
Allis-Chalmers
MC/MCV
15
500
1200, 2000
Allis-Chalmers
MA
4.76
250
1200, 2000
Allis-Chalmers
MA
4.76
350
1200, 2000
Allis-Chalmers
FA
4.76
350
3000
Allis-Chalmers
FB
8.25
500
1200, 2000, 3000
Allis-Chalmers
FC/FCV
15
500
1200, 2000
Allis-Chalmers
FC/FCV
15
750
1200, 2000, 3000
Allis-Chalmers
FC/FCV
15
1000
1200, 2000, 3000
Siemens
3AF (2-High)
H2-3AF
4.76
250
1200, 2000
Siemens
3AF (2-High)
H2-3AF
4.76
350
1200, 2000, 3000
Siemens
3AF (2-High)
H2-3AF
8.25
500
1200, 2000, 3000
Siemens
3AF (2-High)
H2-3AF
15
500
1200, 2000
Siemens
3AF (2-High)
H2-3AF
15
750
1200, 2000
Siemens
3AF (2-High)
H2-3AF
15
1000
1200, 2000, 3000
Siemens
GMI
4.76
250
1200, 2000
Siemens
GMI
4.76
350
1200, 2000, 3000
Siemens
GMI
8.25
500
1200, 2000, 3000
Siemens
GMI
15
500
1200, 2000
Siemens
GMI
15
750
1200, 2000
Siemens
GMI
15
1000
1200, 2000, 3000
GE (All Air-Magnetic)
Magneblast (AMH)
GEHR
4.76
250
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AMH)
GEHR
4.76
350
1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
2.4
100
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
2.4
150
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
4.76
100
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
4.76
150
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
4.76
250
600, 1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
4.76
350
1200, 2000, 3000
GE (All Air-Magnetic)
Magneblast (AM)
8.25
500
1200, 2000, 3000
GE (All Air-Magnetic)
Magneblast (AM)
15
250
1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
15
500
1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
15
750
1200, 2000
GE (All Air-Magnetic)
Magneblast (AM)
15
1000
1200, 2000, 3000
Westinghouse
DH
4.76
150
1200, 2000
Westinghouse
DH
4.76
250
1200, 2000
Westinghouse
DH
4.76
350
3000
Westinghouse
DH
8.25
500
1200, 2000
Westinghouse
DH
15
500
1200, 2000
Westinghouse
DH
15
750
1200, 2000
Westinghouse
DH
15
1000
1200, 2000, 3000
Westinghouse
DHP
4.76
250
1200, 2000
Westinghouse
DHP
4.76
350
1200, 2000
Westinghouse
DHP
8.25
500
1200, 2000, 2500
Westinghouse
DHP
15
500
1200, 2000
Westinghouse
DHP
15
750, 750C
1200, 2000, 2500
Westinghouse
DHP
15
1000
1200, 2000, 2500
ITE
HV
4.76
100
600, 1200
ITE
HV
4.76
150
600, 1200
ITE
HV
4.76
250
600, 1200
ITE
HK
4.76
250
1200, 2000
ITE
HK
8.25
500
1200, 2000
ITE
HK
15
500
1200, 2000
ITE
HK
15
750
1200, 2000
ITE
HK
15
1000 (36" Cell)
1200, 2000
Federal Pacific
DST2
4.76
250
1200, 2000
Federal Pacific
DST2
8.25
500
1200, 2000
Federal Pacific
DST2
15
500
1200, 2000
Federal Pacific
DST2
15
750
1200, 2000
McGraw Edison
PSD
PSR
15
501
1200
McGraw Edison
PSD
PSR
15
502
2000
McGraw Edison
PSD
PSR
15
751
1200

Medium-voltage replacement circuit breaker sample specifications

Medium-voltage vacuum replacement circuit breakers should operate identically to the original circuit breakers including, but not limited to, operation of all Mechanism-Operated Control (MOC) auxiliary switches, Truck-Operated Control (TOC) auxiliary switches, test position operation, and all safety related functions.

 

Sample Replacement Specification

 

I. SCOPE

 

A. This Specification covers requirements for the replacement of air magnetic or oil circuit breakers to vacuum circuit breakers.

 

B. It is the intent of this Specification that the new circuit breaker operates identically to the original received breakers to include, but not limited, operation of all Mechanism-Operated Control (MOC) auxiliary switches, Truck-Operated Control (TOC) auxiliary switches, test position operation, and safety related functions. Siemens MOC-Saver system shall be used for reliable MOC operation.

 

C. It is the intent of this Specification that the new circuit breaker’s capabilities meet performance levels defined in published standards.

 

D. All equipment and parts shall meet the requirements of the latest applicable published standards of IEEE, NEMA, and ANSI including ANSI C37.09.

 

E. In all instances throughout this Specification, the term “Bidder” shall refer to a company submitting a proposal to fulfill the requirements of this Specification.  The term “Seller” shall refer to the successful Bidder who is awarded the purchase order and who has accepted the overall responsibility for filling the requirements of this Specification.

 

F. Whenever equipment proposed by the Bidder cannot satisfactorily meet the intent of this Specification in any respect, such exceptions shall be clearly stated by the Bidder.

 

G. The Seller shall have full responsibility for compliance with the requirements of this specification.  Review and/or approval of drawings or data does not constitute acceptance of any designs, materials, or equipment that will not fulfill the functional or performance requirements established herein.

 

H. The circuit breakers will be replaced over a period of ____________ days / months / years.

 

I. Each bid shall include the following:

1. The price of each circuit breaker replacement.

2. A proposed schedule detailing the sequence of breaker replacements and their required durations as described in the Specification.

 

II. TYPICAL BREAKER DATA

 

A. Air Magnetic circuit breakers to be replaced:

1. Manufacturer:

2. Type:

3. Voltage:

4.  Continuous Current Rating:

5.  Interrupting Class:

 

III. OUTLINE OF WORK

 

The work under this section consists of furnishing all labor, material, and equipment necessary to complete the work described.  All new materials used shall be first quality and the best of each class and shall meet with the recommendations and standards of the various engineering and manufacturing associations.  The replacement shall be in accordance with the most recent draft of the ANSI Standard C37.09 in all regards except required testing that is described in Section IV of this Specification.

 

A. The replacement circuit breaker shall be completely new.  No used material will be allowed.

 

B. All breakers shall have Siemens vacuum interrupters.

 

C. A new, complete vacuum circuit breaker assembly (type Siemens 3AH) shall be used.

 

D. The breaker closing springs are to automatically discharge upon moving the breaker into the disconnect position.

 

E. Breaker open and close semaphore shall be red for close and green for open.

 

F. Manual trip and close handles shall be identified as “trip” and “close.”

 

G. The vacuum breaker assembly’s secondary control terminals and auxiliary terminals shall be wired to the secondary disconnect contacts the same as existing breaker to form a control circuit that is identical in all respects to the original received control circuits.  All control wiring shall be a minimum of #16 AWG stranded, tinned type SIS wire and shall terminate with crimp-type lugs (Burndy Type VAV or approved equal).  All contact ratings shall be greater than or equal to the original manufacturer’s nominal ratings.  Nominal voltage of all related devices is.

 

H. All mechanical and electrical interlocks shall be the same as the existing circuit breaker.  The replacement breaker shall not alter the operating characteristics of the existing mechanical and electrical interlocks.  Bus connections between the vacuum breaker assembly shall be insulated phase-to-phase and phase-to-ground to maintain the original BIL or greater.

 

I. The operating mechanism shall be mounted to the front of the breaker frame assembly for ease of access and maintainability.  All mechanism functions such as stored energy control and breaker tripping and closing shall be accessible from the front.

 

J. An operation counter shall be provided to register one count for each trip operation.  It shall be visible from the front of the breaker.

 

K. The circuit breaker shall be completely assembled and wired in preparation for inspection and testing.

 

L. The completed replacement breaker shall be identical in electrical and physical functions to the received breakers except where enhanced safety interlocking is indicated.

 

M. The Seller shall provide a factory representative who, with the assistance of the Purchaser’s personnel, shall be responsible for the circuit breaker installation to include any required adjustments.

 

N. At the time of installation, the Seller shall train the Purchaser’s personnel on the converted breaker’s operation and maintenance.

 

IV. TESTING

 

Testing shall be in accordance with the latest ANSI Standards and the most recent draft of the ANSI Standard C37.09 in regards to the tests described in this section.

 

The Purchaser reserves the right to witness factory tests and is to be notified at least 10 days prior to these tests.

 

A. Vacuum Breaker Retrofit Elements

The vacuum breaker elements shall be design tested and certified to meet the latest applicable ANSI, NEMA, and IEEE standards.  Certified design tests shall be submitted in accordance with Section 6 of this Specification.  Each breaker element shall be of current manufacture and be fully production tested in accordance with ANSI C37.09, Section 5.

 

B. Completed Vacuum Circuit Breaker Replacement

1. Required Design Tests

 

Complete set of IEEE design tests are to be performed on a completed prototype unit.  The prototype unit shall pass these tests before any additional breakers are built.  If these tests have already been performed on an identical unit, certified copies of these test reports shall be submitted.  This includes but is not limited to:

 

a. Rated Full Wave Impulse Withstand Voltage Test as per ANSI C37.09, Paragraph 4.5.4.

b. Low Frequency Withstand per ANSI C37.09, Paragraph 4.5.3.1

c. Mechanical Endurance Test as per ANSI C37.20.2.  The Seller shall not perform this test except at the direction of the Purchaser.

d. Rated Continuous Current Test as per ANSI C37.09, Paragraph 4.4

e. Close and Latch as per ANSI C37.09, Paragraph 4.6.2.4 and ANSI C37.06 - Table 1

 

2. Production Tests:  The following production tests shall be performed on all replacement units:

a. AC High Potential (HI POT) test to test the breaker’s dielectric strength.  The HI POT test voltage will be supplied by the Purchaser prior to the test.  High voltage insulation will be checked phase-to-phase, phase-to-ground, and line-to-load.

b. Mechanical Operating Test as described in C37.09, Paragraph 5.11, to include the verification of all mechanical and electrical interlocks.

c. Measure and submit the primary circuit path resistance for each pole of the breaker.

 

IV. DOCUMENTATION

 

A. Four (4) copies of the complete inspection report with all test results and data sheets shall be provided for the breakers.

 

B. Four (4) complete sets of breaker schematic wiring drawings shall be provided which show the secondary control block, the close and trip coils, the various breaker switches and contacts, and other electrical components of the breaker.

 

C. Four (4) complete sets of instruction manuals shall be provided with the breaker.

 

D. One (1) copy of documentation shall be shipped with the shipment of replacement breaker(s).

 

V. WARRANTY

 

The Seller shall warrant that the equipment and all parts shall be free from defects in design, manufacturing, and material.  The warranty shall extend for a minimum of one (1) year after commercial operation or eighteen (18) months from delivery.  If, during the warranty period, modifications or repairs of the subject equipment are necessary, the warranty period shall be extended for a minimum of one (1) year from the date of the completion of repair or modification.

Remote racking solutions

Siemens provides cost effective remote circuit breaker racking solutions to keep operators clear of the arc flash zone during circuit breaker racking.

Closed door racking for Allis-Chalmers D and F gear

In order to improve operator safety, Siemens offers a cost effective field modification to convert type D and F switchgear to a closed-door, remote rack design. This modification provides a cost effective solution to keep operators clear of the arc flash zone during breaker racking. 

Allis-Chalmers and later Siemens manufactured type D and F medium-voltage switchgear from 1958 through the late 1980s. This gear utilized air-magnetic circuit breakers that were typically manually racked via a lever while the cubicle panel door was open.

 

Before

 

Original floor-mounted lever racking, commonly used on type D and F switchgear, required the operator to stand in front of the circuit breaker with the panel door open.  The field modification consists of a floor-mounted screw racking device and breaker-mounted bracket to interface with the floor-mounted screw device. These additions allow end-users to either have closed-door manual racking or closed-door remote racking.

 

After

 

Following the field modification, the circuit breaker can be racked in and out while the operator stands outside of the arc flash zone. The closed-door remote racking option requires the above mentioned cell and circuit breaker additions, as well as a minor front panel modification to accept a torque-regulated motor. The motor can be moved from one position to the next, thus only one motor device is required.

Remote racking modification for Siemens 5-38 kV GM Switchgear

In order to improve operator safety, Siemens offers a field modification to convert 5-38kV type GM switchgear to a remote rack design. This modification provides a cost effective solution to keep operators clear of the arc flash zone during circuit breaker racking. Siemens began manufacturing GM medium-voltage switchgear in the late 1980s and still manufactures this equipment today. This gear utilizes vacuum circuit breakers that are manually racked via a hand crank while standing in front of the cubicle. The remote racking option requires a minor front panel modification to accept a torque-regulated motor. The motor can be moved from one cell position to the next, thus only one motor device is required.

 

Before 

 

Original hand crank racking, commonly used on GM switchgear, requires the operator to stand in front of the circuit breaker with the panel door open. 

 

After

 

Following the field modification, the circuit breaker can be racked in and out while the operator stands outside the arc flash zone. 

Siemens integrated electric-racking system (SIERS) for GMSG

Features and benefits

 

Siemens integrated electric-racking system (SIERS) provides additional personnel protection against arc-flash exposure for operators by providing a means of remotely racking the type GMSG drawout circuit breaker. SIERS reduces the need for personal protective equipment (P.P.E.) per the NFPA-70E® standard.

 

Standard features:

  • Maintain all of the safety interlocks as required by IEEE standard C37.20.2
  • Logic control module for control and circuit protection
  • Interference detection
  • Control pendant (hand-held controller)
  • High-torque, fixed-mounted dc motor
  • Available for 125 V dc external power supply
  • Factory installed and tested as a complete racking system.

Optional features:

  • Powered from 120 V ac sources in switchgear
  • Provision for external power source
  • Integrated into the switchgear secondary control circuits or with the protection relay to provide interface with local HMI or SCADA systems
  • Field retrofit for existing Siemens non-arc-resistant, medium-voltage switchgear.

Optional configurations:


Type SIERS device is available in three configurations:

  • Basic version
  • Local HMI version (Sm@rtGear™ power distribution solution)
  • Custom version (i.e., SCADA or other system).

Technology improvements

MOC Saver

Siemens patented MOC-Saver system addresses the various operational issues associated with replacing air-magnetic circuit breakers. The MOC-Saver system controls the velocity operating the original cubicle MOC system, thus mitigating the increased forces that would be applied to the cubicle MOC system. 

The MOC-Saver provides positive MOC switch actuation in the Open and Close directions. The MOC-Saver includes a bi-directional stored energy mechanism (snubber) and a bi-directional hydraulic velocity controller. Operation of the legacy MOC switches requires sufficient energy from the vacuum circuit breaker stored energy mechanism to reliability close the circuit breaker while not damaging the MOC system yet maintaining full interchangeability. 

52STA actuator

The 52STA actuator originally supplied with the legacy GE Magna-Blast switchgear was designed to absorb the output forces generated by the legacy circuit breakers stored energy mechanism and protect the MOC switches. Unfortunately, after years of use, the original 52STA actuator may develop a tendency to bind and not reset the MOC force that is generated in the stored energy mechanism of modern circuit breakers can be a problem for equipment owners. Fortunately, Siemens has developed replacement 52STA actuator mechanisms to prevent potential problems associated with these known issues and incorporated it in their replacement circuit breakers for legacy GE Magne-Blast switchgear in the US market.

TechTopics is a series of papers that discuss issues of interest to users or specifiers of electrical equipment. Whether your equipment was made by Allis-Chalmers, Westinghouse, GE, Federal Pacific, ITE, McGraw Edison, or another manufacturer, we will assist you to evaluate the Siemens medium-voltage vacuum replacement option which best meets your needs.

Mailing address

Siemens Industry, Inc.

7000 Siemens Road

Wendell, North Carolina 27591

United States