On-Load Tap-Changers

We invented the on-load tap-changer, and pioneering innovations are still coming to us all the time

Beginning with OILTAP® technology, we were the world market leader in transformer tap-change operations.

Our VACUTAP® technology revolutionized the on-load tap-changer yet again. Because the tap-change operation happens in a vacuum, our products are generally maintenance-free, which allows the life cycle costs of our customers to be drastically reduced.

Today, our wide product range includes vacuum switches for all types of transformers and applications, from network transformers to special applications.

Quality and reliability

Quality and reliability

And of course, with all MR on-load tap-changers you benefit from the well-known MR quality and reliability.

Five reasons why you should choose MR on-load tap-changers:

  1. unmatched experience
  2. superior technical solutions
  3. multi-certified quality
  4. excellent lifetime support
  5. full system capability

Endurance test for on-load tap-changers at MR Test Center Regensburg - unique in the world

VACUTAP® VVS® VV® VM® VR® VT® AVT RMV-II
Max. rated through-current (1-phase) - 400 A 1500 A 1800 resp. 2600 A * 500 A - 2500 A
Max. rated through-current (3-phase) 400 A 600 A 650 A 1300 A 500 A 170 A 2500 A
Max. rated step voltage 1300 V 2000 V 3300 V 6000 V 900 V 500 V 1000 V
Max. rated switching capacity (1-/3-phase) 400 kVA 700 kVA 3500 / 1625 kVA 6000 kVA 250 kVA 75 kVA 2500 kVA
Highest voltage for equipment Um 40 - 76 kV 40 - 145 kV 72,5 - 300 kV 72,5 - 420 kV 40,5 kV 11,5 kV 70 kV

Application at neutral point (3-phase) or at any selectable winding position:
Operating positions without change-over selector - max. 12 max. 22 max. 18 max. 9 max. 9 max. 17
Operating positions with change-over selector max. 19 max. 23 max. 35 max. 35 - - max. 33

 

* with enforced current splitting of the transformer winding

ECOTAP® VPD® I VPD® III
Number of phases 1 3
Max. rated through-current 30 A 30 A / 100 A
Max. rated step voltage 825 V 825 V
Max. rated switching capacity 24,75 kVA 82,5 kVA
Highest voltage for equipment Um 36 kV 36 kV / 40,5 kV

Application at neutral point or at any selectable winding position:
Operating positions without change-over selector max. 9 max. 9
Operating positions with change-over selector - max. 17

 

OILTAP® V R G
Max. rated through-current (1-/3-phase) 200 / 400 A 3000 / 1200 A 4500 / 2000A
Max. rated step voltage 1500 V 4000 V 5000 V
Max. rated switching capacity (1-/3-phase) 525 kVA 6000 / 3000 kVA 6500 / 5000 kVA
Highest voltage for equipment Um 40 - 123 kV 72,5 - 362 kV 72,5 - 362 kV

Application at neutral point (3-phase) or at any selectable winding position:
Operating positions without change-over selector max. 14 max. 18 max. 18
Operating positions with change-over selector max. 27 max. 35 max. 35

 

VACUTAP® VV®

Compact on-load tap-changer in vacuum technology for transformers of the medium power range. VACUTAP® VV® is the professional for network…
+ Um: 40 - 145 kV
+ Ir (1-/3-phase): 400 / 600 A
+ Uir: 2000 V

VACUTAP® VVS®

The most compact on-load tap-changer in vacuum design for use in small and medium network transformers. VACUTAP® VVS® impresses with a combination of…
+ Um: 40 - 76 kV
+ Ir (1-/3-phase): - / 400 A
+ Uir: 1300 V

VACUTAP® VM®

Universal on-load tap-changer in vacuum design for transformers of the medium power range. VACUTAP® VM® is the product for all familiar applications…
+ Um: 72,5 - 300 kV
+ Ir (1-/3-phase): 650 / 1500 A
+ Uir: 3300 V

VACUTAP® VR®

Universal on-load tap-changer in vacuum technology for transformers with special power requirements. VACUTAP® VR® is the most powerful on-load…
+ Um: 72,5 - 420 kV
+ Ir (1-/3-phase): 1300 / 1800 A
+ Uir: 6000 V

VACUTAP® RMV-II

Our first reactor-type on-load tap-changer with vacuum interrupters, developed in the 1980s specially for use in North America. VACUTAP® RMV impresses…
+ Um: 70 kV
+ Ir (1-/3-phase): 2500 A
+ Uir: 1000 V

VACUTAP® VBO®

VACUTAP® VBO® is the first resistor-type, bolt-on on-load tap-changer (OLTC) in vacuum technology offering all advantages of this established…
+ VACUTAP® technology offers nearly maintenance-free on-load tap-changers for all electrical energy supply applications
+ State of the art intelligent direct drive offers maximum flexibility
+ 1:1 retrofit of corresponding AT-type OLTCs possible

VACUTAP® VT®

Air-insulated on-load tap-changer in vacuum technology for controllable, cast-resin-insulated distribution transformers in the medium and high power…
+ Um: 40,5 kV
+ Ir (1-/3-phase): 500 A
+ Uir: 900 V

VACUTAP® AVT

Air-insulated on-load tap-changer in vacuum technology with integrated drive and automatic voltage regulator for small to medium controllable,…
+ Um: 11,5 kV
+ Ir (1-/3-phase): - / 170A
+ Uir: 500 V

OILTAP® V

The most compact on-load tap-changer in oil design for use in small and medium network transformers.
+ Um: 40 - 123 kV
+ Ir (1-/3-phase): 200 / 400 A
+ Uir: 1500 V

OILTAP® R

Universal on-load tap-changer in oil technology for transformers with special power requirements
+ Um: 72,5 - 362 kV
+ Ir (1-/3-phase): 3000 / 1200 A
+ Uir: 4000 V

OILTAP® G

Universal on-load tap-changer in oil technology for high-power transformers. OILTAP® G is the most powerful on-load tap-changer in oil technology. It…
+ Um: 72,5 - 362 kV
+ Ir (1-/3-phase): 4500 / 2000A
+ Uir: 5000 V

Oil Filter Unit

During every tap-change operation, the optional OF 100 oil filter unit cleans and dries the insulating fluid of an on-load tap-changer, thus…
+ Safe operation of OILTAP® due to continuous cleaning and drying of the tap-changer oil
+ Reduction of maintenance work with OILTAP®

ECOTAP® VPD® I

The smallest high-speed resistance type tap-changer in the world, made for single-phase applications. The ECOTAP® VPD® can be easily integrated in…
+ Also for all pole-mounted transformers starting at 10 kVA and higher
+ Principle of the high-speed resistor-type tap-changer used for decades in power transformers
+ Low investment costs. Maintenance-free for the life of the transformer

ECOTAP® VPD® III

ECOTAP® VPD® is the solution for all operators who have to maintain stable voltage in public, industrial and private distribution grids. Compact and…
+ Large regulating range with up to 17 operating positions. Simple replacement.
+ Low investment costs. Maintenance-free for the life of the transformer
+ One standard for all grid types and applications

TAPMOTION® ED

The motor-drive type TAPMOTION® ED is used exclusively for operating on-load tap-changers and de-energized tap-changers in regulating transformers as…
+ Has a transparent and modular design (swing frame) frame)
+ Incorporates decades of experience

TAPMOTION® MD-III

+ The product is designed in modules which allows an easy extension, even on site.
+ Easy extension of a voltage regulator TAPCON® 250 with direct connection of the tap position signal.
+ Major components are implemented from the motor-drive unit TAPMOTION® ED and the well approved MD-I and MD-II.
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