What Ruhstrat Power Technology does

RPT Ruhstrat Power Technology GmbH is a privately held German manufacturer of electrical transformers, voltage optimization systems, and electrical testing equipment, headquartered in Bovenden/Lenglern. Founded in 1888 by Adolf and Ernst Ruhstrat in Göttingen, the company operates three product families: test engineering (heat cycle test systems, temperature rise tests, inductive/ohmic/RLC load units, and customized test benches for motors, gearboxes, and pumps via partnership with Tornatec); voltage optimization (OLIVER online voltage regulation, EOS electronic online stabilizer, NESSY mains voltage stabilization, voltage stabilizers, and DeltaVolt energy-cost reduction systems); and transformers and chokes (cast resin up to 20 MVA, dry-type, variable, high-current up to 30,000 A, special, and integrated transformer systems with PLC control).

The company sells custom-engineered solutions through a direct B2B enterprise sales motion to industrial manufacturers, maritime and offshore operators, EV fast-charging infrastructure providers, and utilities across Germany and international markets enabled by ISO 9001:2015 and UL/CSA certifications. Reference customers include ABB, Siemens, AEG, Alstom, SMA, AUMA, and the Fraunhofer Society. Pricing is quote-based with multi-year project contracts; no e-commerce or self-service channel exists. The firm employs 51-100 people and was acquired by EISENMANN AG in 2011, with operations transferred back to Andreas Ruhstrat under the current RPT entity in 2019.

The company does not currently pursue AI/ML capabilities and has no disclosed external funding.

Name

Ruhstrat Power Technology

Legal name

RPT Ruhstrat Power Technology GmbH

Website

https://ruhstrat.com

Company type

Private

Founded year

1888

Operating status

Operating

Headcount range

51–100 employees

Short description

RPT Ruhstrat Power Technology is a German manufacturer (founded 1888, 51-100 employees) of custom transformers, voltage optimization systems, and electrical testing equipment, serving industrial manufacturers, maritime/offshore operators, EV charging, and utilities via direct enterprise sales.

Ownership category

akta.pro rank

Product category

Electrical Transformers and Power Equipment

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Switchgear and Switchboard Apparatus Manufacturing (335313), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Power, Distribution & Specialty Transformers (3612), Switchgear & Switchboard Apparatus (3613), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Testing, Commissioning, Maintenance & Retrofit/Modernization (Substations/Switchgear) (EUADACAL), Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components (EUADACAH)

Keywords

• Electrical transformers manufacturing
• Voltage optimization systems
• Electrical testing equipment
• Cast resin transformers
• Power quality equipment

Headquarters

HQ city

Bovenden

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure

Revenue model

1. Custom Transformer Sales: Design and manufacture of custom transformers including cast resin, dry-type, variable, high-current, and special transformers for low and medium voltage applications. Sales are project-based with customer-specific configurations.
2. Voltage Optimization Equipment: Sale of voltage stabilization and optimization systems including OLIVER, EOS, NESSY, DeltaVolt, and voltage stabilizers. Products protect against voltage dips, stabilize supply, and optimize energy costs.
3. Electrical Test Systems: Customized test systems for drive technology, heating tests, high-voltage cables, and pump testing. Includes heat cycle test systems, load units (ohmic, inductive, RLC), and test benches for motors, gearboxes, and pumps.
4. Engineering and Consulting Services: Technical consulting for testing strategies, needs analyses, and investment planning for test equipment and voltage optimization solutions.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

RPT Ruhstrat Power Technology manufactures and supplies custom-engineered electrical transformers (cast resin, dry-type, variable, high-current, and special types), voltage optimization and stabilization systems (OLIVER, EOS, NESSY, DeltaVolt, voltage stabilizers), and electrical testing equipment (heat cycle test systems, temperature rise test systems, ohmic/inductive/RLC load units, drive technology test benches). The company delivers project-based solutions with in-house transformer manufacturing, switchboard construction, and PLC control integration for industrial, maritime, EV charging, and research applications.

Product overview

RPT Ruhstrat Power Technology offers a comprehensive portfolio of electrical testing equipment, voltage optimization systems, and transformers. The three core product lines are: (1) Test Engineering products including Heat Cycle Test Systems for high-voltage cables, Test Systems for Temperature Rise Tests, Inductive/Ohmic/RLC Load Units, and Pump Test Benches for testing motors, gearboxes, pumps, and drive systems; (2) Voltage Optimization products including OLIVER Online Voltage Regulation, EOS Electronic Online Stabilizer, NESSY Mains Voltage Stabilization, Voltage Stabilizer/Constant Voltage Holder, and DeltaVolt for energy cost reduction; (3) Transformers and Chokes including Cast Resin Transformers, Dry Transformers, Variable Transformers, High Current Transformers up to 30,000A, Special Transformers, Transformer Systems, and Chokes. The company serves industrial and research applications including maritime/offshore, fast charging stations, distribution grids, and protection against voltage dips. Founded in 1888, the company has over 130 years of experience in electrical engineering.

Differentiator

Problem solved

Functional benefit

Products and services

• Heat Cycle Test Systems High-current cable testing systems designed for type tests according to IEC 60840, IEC 62067, and IEC 62985, with mobile folding cores for high current excitation and temperature control for load cycle simulation.
• Test Systems for Temperature Rise Tests Testing systems for switchgear and busbars under rated or defined overload in continuous tests, featuring rated currents up to 30,000 amps AC and 22,000 amps DC with separate modular design of control, actuator, and high-current unit.
• Test Systems with Voltage, Current and Frequency Control Complete range of test systems for voltage control up to 36,000 V, current control up to 30,000 A, and frequency control up to 800 Hz for testing electrical and electronic components.
• Inductive Load Units AC/DC chokes for loading products with active and reactive power, with voltage up to 1000V, current up to 3,000A with freely selectable inductance, and optional contactors and coupling relays.
• Ohmic Load Units Real ohmic loads for testing electronic and electrical components with power up to 5,000 kW and individual stages that can be switched on and off under load, used for load testing of generators, switchgear, power electronics, and transformers.
• RLC Load Combination of resistive, inductive, and capacitive load units for testing effects of long line runs in PV systems, voltage spikes of CHP units, or islanding of renewable energy systems, with power up to 2,500 kW or 2,500 kVAr at up to 1000 Volt.
• Test Systems for Drive Technology Customized test benches for electric motors, gearboxes, pumps, blowers, electromechanical components, frequency converters, and drive systems, including load test benches for electric motors and test benches for blowers.
• Pump Test Bench Customized test benches for pumps built through strategic partnership with Team Test and Automation System Technology (Tornatec), including switchgear with drive/inverter technology, measurement technology, mechanical structure with base frame and clamping plate, and tank and piping system with control valves.
• OLIVER – Online Voltage Regulation Inverter-based three-phase active line voltage regulator for highly dynamic correction of symmetrical and asymmetrical voltage dips and phase unbalances, protecting sensitive loads from mains voltage problems with power up to 1,800 kVA and response time of 140 microseconds.
• EOS – Electronic Online Stabilizer Fast voltage stabilizer that corrects voltage deviations within less than 10 ms using proven OLIVER technology, with power up to 3,000 kVA, voltage 208-690 V, response time of 140 microseconds, and settling time under 3 ms.
• NESSY – Mains Voltage Stabilization System Grid voltage stabilization system for low-voltage grids ensuring independence from grid fluctuations, with power range 50-630 kVA, regulation of voltage fluctuations up to ±15%, and compatibility with oil and cast resin transformers.
• Voltage Stabilizer Voltage stabilizer for compensating large and long-term mains voltage fluctuations, with power range up to 1,600 kVA, regulation of voltage fluctuations up to ±30%, and control speed of 40V/s.
• DeltaVolt Voltage optimization system that controls and stabilizes supplied mains voltage within EN 50160 framework, reducing energy costs by up to 15% for voltage-dependent consumer groups with power up to 2,500 kVA.
• Cast Resin Transformers Cast resin transformers with power ratings up to 20 MVA and series voltages up to 36 kV, manufactured according to IEC/EN 60076, DIN EN 50541-21, VDE 0532, DIN 42523, with climate class C2, environment class E2, and fire class F1 for safe installation in living and working environments.
• Dry Transformers Dry-type transformers for low and medium voltage with power range up to 6 MVA, voltage range up to 20 kV, and currents up to 30 kA, available in single-phase and three-phase versions with separate winding or economy winding.
• Variable Transformers Transformers for adjusting AC voltages or currents under load between zero and rated value, designed as variable toroidal transformer and variable column transformer per IEC EN 61558-2-14 and VDE 0552, with voltage up to 1,000V and protection class up to IP 54.
• High Current Transformers Toroidal transformers in encapsulated design up to 30,000 A, featuring tape ring core with primary winding forming excitation unit and secondary voltage induced on high-current bar, with completely potted design and IP54 protection.
• Special Transformers Transformers for special niche applications up to 20 MVA with voltage range up to 36 kV and currents up to 30 kA, including air-insulated MV transformers, water cooled high current transformers, and converter transformers.
• Transformer Systems System solutions combining transformers with variable transformer or converter for voltage or frequency control, integrated circuit breaker or control systems with PLC, ensuring right voltage with robustness and reliability worldwide.
• Chokes Reliable and safe winding goods for smoothing current in drive technology and test field applications, with chokes up to 3,000 A and selectable inductance values, nominal frequency chokes from 16⅔ Hz to 400 Hz, including mains choke, smoothing choke, compensating choke, filter circuit choke, and motor choke.
• Engineering and Consulting Services Technical consulting services for testing strategies, needs analyses, and investment planning for test equipment and voltage optimization solutions, provided alongside custom equipment sales.

Quantifiable outcome

• DeltaVolt reduces energy costs by up to 15%
• +3 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Team Test and Automation System Technology (Tornatec)coreStrategic or Co-development PartnerStrategic partnership with Tornatec for building customized test benches for electric motors, gearboxes, pumps, blowers, electromechanical components, frequency converters and drive systems. Combined experience used to advise customers on testing strategies and prepare needs analyses for targeted investment planning.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Maschinenfabrik Reinhausen: German-based specialist in voltage regulation (OLTC transformers) and power quality equipment. Highly comparable to Ruhstrat's voltage optimization and transformer businesses, particularly NESSY and OLIVER products, with overlapping customer profiles in utilities and industrial power.
• Hammond Power Solutions: Canadian designer and manufacturer of custom-engineered dry-type and cast resin transformers, reactors, and specialty magnetics. Highly comparable niche specialty transformer manufacturer serving similar industrial customer applications.
• Pfiffner Group: Swiss-based specialist in instrument transformers, voltage regulation, and power quality solutions. Closely comparable to Ruhstrat in product breadth (transformers + voltage stabilization) and European industrial customer base.
• Magtrol: Manufacturer of motor testing equipment, load units, and test benches for electric motors, gearboxes, and pumps — directly comparable to Ruhstrat's Test Engineering product line including heat cycle tests, RLC loads, and drive test systems.

Broad incumbents

• ABB: Global broad-line power and automation incumbent offering transformers, switchgear, and power quality solutions. A reference customer of Ruhstrat and a primary competitor in industrial and utility segments.
• Siemens: Diversified industrial conglomerate with significant transformer and power-quality portfolios. Listed as a Ruhstrat reference customer while also competing across the same product categories.
• Schneider Electric: Global energy management and automation major offering voltage regulation, transformers, and power quality products across industrial and utility segments, overlapping with Ruhstrat's voltage optimization portfolio.
• Eaton: US-based power management company with broad transformer, switchgear, and power quality offerings, including voltage regulators that compete with Ruhstrat's OLIVER and EOS lines in industrial and data center applications.
• Hitachi Energy: Global transformer and grid infrastructure specialist (formerly Hitachi ABB Power Grids). Competes directly with Ruhstrat in distribution and specialty transformers, particularly for utility and industrial customers.

Regional players

• Kirloskar Electric: Indian manufacturer of transformers, rotating machines, and power quality equipment. Comparable in transformer product breadth, but primarily serves South Asian markets rather than Ruhstrat's European focus.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/rpt-ruhstrat

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Ruhstrat Power Technology