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
Technical data at a glance
The following tables provide key technical data for our on-load tap changers.
You can also download the overview as a PDF file.
Download nowVacuum type
| Assembly | In-tank | Dry type | Bolt-on | |||||||
| Switching principle | Resistor-type | Reactor-type | ||||||||
| Type | VACUTAP® VI | VACUTAP® VV® | VACUTAP® VVS | VACUTAP® VM® | VACUTAP® VR® | VACUTAP® VRL® | VACUTAP® AVT | VACUTAP® VT® | VACUTAP® VBO® | VACUTAP® RMV-II |
| Max. rated through-current (1 phase) | – | 400 A* | – | 1500 A | 1600 A / 2600 A* | 3200 A | – | 500 A | – | – |
| Max. rated through-current (3 phase) | 400 A | 600 A | 400 A | 650 A | 1600 A | – | 170 A | 500 A | 400 A | 2500 A |
| Max. rated step voltage | 1500 V | 2000 V | 1300 V | 3300 V | 6000V / 12000 V* | 6000 V | 500 V | 900 V | 825 V | 1000 V |
| Max. step capacity (1-/3-phase) | - / 600 kVA | 700 kVA / 700 kVA | - / 400 kVA | 3500 kVA / 1625 kVA | 6000 kVA or 12000 kVA* / 6000 kVA | 10.000 kVA / – | – / 85 kVA | 250 kVA / 250 kVA | – / 330 kVA | – / 1625 kVA |
| Highest voltage for Equipment Um | 40 – 123 kV | 40 – 145 kV | 40 – 76 kV | 72.5 – 300 kV | 72.5 – 420 kV | 72.5 – 420 kV | 12 kV | 40.5 kV | 40 kV | 15 – 72.5 kV |
| Operating positions without change-over selector | 14 max. | 12 max. | – | 22 max. | 18 max. | 18 max. | 9 max. | 9 max. | 17 max. | 17 max |
| Operating positions with change-over selector | 27 max. | 23 max. | 19 max. | 35 max. | 35 max. | 35 max. | – | – | 33 max. | 33 max. |
| Operating positions with multiple coarse change-over selector | – | – | – | 107 max. | 107 max. | 107 max. | – | – | – | – |
| *600 A on request | *Special design | |||||||||
| Assembly | In-tank | |
| Switching principle | Resistor-type | |
| Type | ECOTAP® VPD I | ECOTAP® VPD III |
| Number of phases | 1 | 3 |
| Max. rated through-current (1 phase) | 30 A | 100A |
| Max. rated through-current (3 phase) | - | 100A |
| Max. rated step voltage | 825 V | 825 V |
| Max. step capacity (1-/3-phase) | 24,75 kVA | 82.5 kVA |
| Highest voltage for Equipment Um | 36 kV | 36 kV - 40.5 kV* |
| Operating positions without change-over selector | 9 max. | 9 max. |
| Operating positions with change-over selector | - | 17 max.** |
| *40.5 only with 3 phases **No change-over selector for 1 phase (max. 9 positions) |
||
Oil type
| Assembly | In-tank | |
| Switching principle | Resistor-type | |
| Type | OILTAP® V | OILTAP® G |
| Max. rated through-current (1-/3-phase) | 350 A / 350 A | 4500 / 2000 A |
| Max. rated step voltage | 1500 V | 5000 V |
| Max. rated switching capacity (1-/3-phase) | 525 kVA / 525 kVA | 6500 / 5000 kVA |
| Highest voltage for equipment Um | 40 - 123 kV | 72,5 - 362 kV |
| 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
VACUTAP® VI
The VACUTAP® VI was specifically developed for grid operation and limited space conditions. Thanks to its intelligent design, direct drive and a…
Um: 40 - 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: 12 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: 825 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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