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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® VRL® VT® AVT RMV-II
Max. rated through-current (1-phase) - 400 A 1500 A 1600 resp. 2600 A * 3200 A 500 A - 2500 A
Max. rated through-current (3-phase) 400 A 600 A 650 A 1600 A - 500 A 170 A 2500 A
Max. rated step voltage 1300 V 2000 V 3300 V 6000 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 10000 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** 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. 18 max. 9 max. 9 max. 17
Operating positions with change-over selector max. 19 max. 23 max. 35 max. 35 max. 35 - - max. 33

* with enforced current splitting of the transformer winding
** variant dependent

ECOTAP® VPD® I VPD® III VI
Number of phases 1 3 3
Max. rated through-current 30 A 30 A / 100 A 400 A
Max. rated step voltage 825 V 825 V 1500 V
Max. rated switching capacity 24,75 kVA 82,5 kVA 600 kVA
Highest voltage for equipment Um 36 kV 36 kV / 40,5 kV 76 - 123 kV

Application at neutral point or at any selectable winding position:
Operating positions without change-over selector max. 9 max. 9 max. 14
Operating positions with change-over selector - max. 17 max. 27
OILTAP® V G
Max. rated through-current (1-/3-phase) 200 / 400 A 4500 / 2000 A
Max. rated step voltage 1500 V 5000 V
Max. rated switching capacity (1-/3-phase) 525 kVA 6500 / 5000 kVA
Highest voltage for equipment Um 40 - 123 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
Operating positions with change-over selector max. 27 max. 35

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…
+ Um: 36 kV
+ Ir (1-/3-phase): 30 A / -
+ Uir: 825 V

ECOTAP® VPD® III

ECOTAP® VPD® is the solution for all operators who have to maintain voltage in a defined and stable band in public, industrial and private…
+ Um: 36 kV / 40,5 kV
+ Ir (1-/3-phase): - / 30 A or 100 A
+ Uir: 825 V

ECOTAP® VI

The ECOTAP® VI is an innovative on-load tap-changer in vacuum technology that is used in small and medium-sized power transformers. It impresses with…
+ Um: 76 - 123 kV
+ Ir (1-/3-phase): - / 400 A
+ Uir: 1500 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® 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 A / 600 A
+ Uir: 2000 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): 2600 A* / 1600 A
+ Uir: 6000 V

VACUTAP® VRL®

The transformation of energy systems places enormous demands on system-critical network components such as power transformers. Our answer to this is…
+ Um: 72,5 - 420 kV
+ Ir (1-/3-phase): 3200 A / -
+ Uir: 6000 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): 1500 A / 650 A
+ Uir: 3300 V

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 / 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): - / 170 A
+ Uir: 500 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 / 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…
+ Um: 40 kV
+ Ir (1-/3-phase): - / 400 A
+ Uir: 850 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 A / 400 A
+ Uir: 1500 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 A / 2000 A
+ Uir: 5000 V
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