VACUTAP® VBO®
Future-proof resistor-type bolt-on tap-changer solution for transformers up to 40 kV
Note: We are currently working on new and improved generations of our OLTC VACUTAP® VBO® and drive unit ETOS® ID.
Start of delivery for both products will be in the second half of 2025.
VACUTAP® VBO® is the first resistor-type, bolt-on on-load tap-changer (OLTC) in vacuum technology offering all advantages of this established technology enriched with further possibilities by an innovative direct drive system.
VACUTAP® VBO® is retrofit-compatible, flange mounting (either screwed or welded) and winding connections are identical to existing AT on-load tap-changer design. Innovative direct-drive technology eliminates drive shafts and bevel gears and enables a remote and flexible installation of the drive control cabinet.
Your Advantages at a Glance
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Maintenance-free
VACUTAP® technology offers nearly maintenance-free on-load tap-changers for all electrical grid applications
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Compact design
The compact design of the VBO® offers 1:1 retrofit possibilities, e.g. corresponding AT-types
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Flexible & easy to install
State of the art intelligent direct drive offers maximum flexibility including remote installation of motor control cabinet
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Eco-friendly
VACUTAP® technology needs less material in production, reduces lifecycle costs and enables use of alternative insulating liquids
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Enabler for digitization
ETOS® technology offers access to transformer digitization and digital asset management e.g. controls, monitoring and communication
Product Information
VACUTAP® VBO
Compact tap-changer, bringing all the advantages of the established vacuum technology to resistor-type bolt-on tap-changers, with proven MR quality and reliability
Innovative direct drive
Directly mounted to the tap-changer, flexibly connected to the ETOS® control cabinet via cables, no drive shaft
ETOS® ID: control cabinet
Automated drive control, convenient entry into transformer digitalization, full ETOS® monitoring, regulation and control functions can be expanded as required
- Substitution of transformer control cabinet possible
Convenient starting point for digitization
ETOS® is a modular, manufacturer-independent system for transformer monitoring, regulation and control.
Drive functions are included in ETOS® ID as standard.
The following functions can be added as required:
Regulation functions: Cooling, Voltage
Monitoring functions: Temperature, Bushing, On-load tap changer, Online DGA / BDV
| Number of phases | III |
| Max. rated through-current | 400 A |
| Rated short-time withstand current | 4 kA |
| Rated short-circuit duration | 3 s |
| Rated peak withstand current | 10 kA |
| Max. rated step voltage | 825 V |
| Step capacity | 330 kVA |
| Rated frequency | 50…60 Hz |
| Number of positions | without COS*: 17 / with COS*: 33 |
| Motor-drive | ETOS® ID, direct drive |
| Highest voltage for equipment | 40 kV |
| Rated lightning impulse withstand voltage | 200 kV |
| Rated short-duration power frequency withstand voltage | 70 kV |
| * COS = Change-over selector | |
Select language
VACUTAP® VBO
Compact tap-changer, bringing all the advantages of the established vacuum technology to resistor-type bolt-on tap-changers, with proven MR quality and reliability
Innovative direct drive
Directly mounted to the tap-changer, flexibly connected to the ETOS® control cabinet via cables, no drive shaft
ETOS® ID: control cabinet
Automated drive control, convenient entry into transformer digitalization, full ETOS® monitoring, regulation and control functions can be expanded as required
- Substitution of transformer control cabinet possible
Convenient starting point for digitization
Convenient starting point for digitization
ETOS® is a modular, manufacturer-independent system for transformer monitoring, regulation and control.
Drive functions are included in ETOS® ID as standard.
The following functions can be added as required:
Regulation functions: Cooling, Voltage
Monitoring functions: Temperature, Bushing, On-load tap changer, Online DGA / BDV
| Number of phases | III |
| Max. rated through-current | 400 A |
| Rated short-time withstand current | 4 kA |
| Rated short-circuit duration | 3 s |
| Rated peak withstand current | 10 kA |
| Max. rated step voltage | 825 V |
| Step capacity | 330 kVA |
| Rated frequency | 50…60 Hz |
| Number of positions | without COS*: 17 / with COS*: 33 |
| Motor-drive | ETOS® ID, direct drive |
| Highest voltage for equipment | 40 kV |
| Rated lightning impulse withstand voltage | 200 kV |
| Rated short-duration power frequency withstand voltage | 70 kV |
| * COS = Change-over selector | |
Select language
