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:
- unmatched experience
- superior technical solutions
- multi-certified quality
- excellent lifetime support
- 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: |
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| 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: |
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| 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: |
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| 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 or 100 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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