What SERGI does

SERGI is a privately held engineering company founded in 1952 that designs and supplies mechanical systems for protecting critical power transformers. Its core technology is a passive rapid pressure-relief mechanism intended to limit tank rupture, fire, oil release, and cascading power failure; SERGI states that it operates within milliseconds, before electrical relays or fire systems respond, and independently of electrical detection or external power.

SERGI's stated revenue model is hardware sales for mechanical protection systems, complemented by associated engineering services; pricing is not publicly disclosed. It sells through direct expert consultation and case-by-case engineering assessment to infrastructure operators, insurers, and authorities across six verticals: nuclear, power and utilities, data centers and digital infrastructure, oil and gas, transport and critical facilities, and industrial and manufacturing. Its portfolio also includes fire and consequence mitigation, resilience accessories, simulation and multiphysics engineering, retrofit and modernization, and proof and standards; the stated deployment footprint is worldwide.

Name

SERGI

Legal name

Protège-transformateur SERGI

Website

https://sergi-energy.com

Company type

Private

Founded year

1952

Operating status

Operating

Short description

SERGI is a privately held engineering company that supplies passive mechanical transformer protection systems and engineering services to nuclear, utility, data-center, oil-and-gas, transport, and industrial operators worldwide to limit transformer explosions, fires, and outages.

Ownership category

akta.pro rank

Product category

Power Transformer Protection Systems

NAICS

Relay and Industrial Control Manufacturing (335314)

SIC

Electrical Industrial Apparatus (3620), Measuring & Controlling Devices, Nec (3829)

akta.pro primary industry

Process Safety & Relief Systems (Flare Systems, PRVs, Explosion Protection) (IMAHAEAL)

akta.pro secondary industries

Protection, control & substation automation engineering (relay/RTU/IEC 61850) (EUADAKAD), Special Hazard Fire Suppression Systems (Clean Agent/Foam/CO2/Kitchen Hood) (IMAIAJAE)

Keywords

• Transformer explosion prevention
• Mechanical transformer protection
• Power transformer safety
• Pressure-relief systems
• Grid resilience equipment

Headquarters

HQ city

Taverny

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. Mechanical Transformer Protection Systems: SERGI provides mechanical transformer explosion prevention technology and associated engineering services for critical infrastructure protection. Solutions are engineered case-by-case based on transformer parameters, voltage level, power rating, oil volume, and site-specific conditions. Deployment includes risk understanding, engineering & simulation, protection strategy, and implementation & lifecycle support.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

SERGI designs and engineers mechanical pressure-relief protection systems for critical power transformers that prevent explosion, tank rupture, fire, and oil release during internal fault events. The technology operates passively and within milliseconds, acting as the last line of defense when electrical relays and fire suppression systems are too slow. Solutions are engineered case-by-case based on transformer parameters and site-specific conditions, with deployment including risk assessment, engineering & simulation, protection strategy, and lifecycle support.

Product overview

SERGI offers a unified portfolio of mechanical transformer explosion prevention solutions. The core offering is the Mechanical Transformer Explosion Prevention Technology based on rapid pressure-relief principles, which operates as the last line of defense when electrical relays and fire suppression systems are too slow. This core product is complemented by Transformer Protection (engineered protection systems), Fire & Consequence Mitigation (downstream fire handling), and Resilience Accessories (lifecycle support). Engineering services including Simulation & Multiphysics Engineering, Retrofit & Modernization, and Proof & Standards complete the offering, enabling end-to-end support from risk assessment through implementation and validation.

Differentiator

Problem solved

Functional benefit

Products and services

• Transformer Protection (Mechanical Transformer Explosion Prevention Technology) Mechanical pressure-relief protection system engineered case-by-case for power transformers, preventing tank rupture, explosion, and fire escalation by acting within milliseconds before electrical relays or fire suppression systems can respond. Designed for critical infrastructure in nuclear, power & utilities, data centers, oil & gas, transport, and industrial environments.
• Fire & Consequence Mitigation Fire mitigation systems designed to handle consequences after mechanical prevention, enabling downstream fire suppression systems to function as intended.
• Resilience Accessories Supplementary accessories that enhance the resilience of transformer protection systems throughout their operational lifecycle.
• Simulation & Multiphysics Engineering Engineering services using multiphysics simulation to model and analyze transformer failure scenarios and validate protection strategies for customer-specific installations.
• Retrofit & Modernization Services for upgrading and modernizing existing transformer protection systems to meet current safety standards and operational requirements.
• Proof & Standards Testing, validation, and standards compliance services that provide documented evidence of protection system performance under realistic fault conditions.

Quantifiable outcome

• Protection operates within milliseconds — before electrical relays or fire systems can respond
• +1 more outcomes

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Scale indicators2 records

Recent moves3 records

Expansion highlights4 records

Broad incumbents

• Eaton: Eaton manufactures power management equipment including transformers, switchgear, and protection devices for utility, industrial, and data center customers. It is comparable to SERGI through its electrical protection portfolio serving similar end markets, though Eaton operates at much greater scale and broader scope.
• ABB (Electrification): ABB's Electrification business manufactures switchgear, protection relays, and transformer monitoring solutions deployed across utilities and industrial infrastructure. It is comparable as a broad incumbent offering electrical protection layers that complement or substitute for SERGI's mechanical protection philosophy.
• Schneider Electric: Schneider Electric offers transformer protection relays, substation automation, and power management solutions across utility, data center, and industrial verticals. It is comparable as a broad incumbent in the electrical protection space targeting similar critical infrastructure customers as SERGI.
• GE Vernova: GE Vernova provides grid solutions, transformers, and protection systems to power utilities and industrial operators. It is comparable to SERGI as a diversified incumbent in the power equipment and grid protection space with overlapping customer segments but not a focus on mechanical last-line explosion prevention.
• Hitachi Energy: Hitachi Energy is a major global supplier of power transformers, switchgear, and protection systems for utilities and industrial customers. It is comparable to SERGI as a broad incumbent that offers transformer protection capabilities as part of a much wider portfolio, including integrated protection relays and monitoring rather than purely mechanical last-line defense.
• Siemens Energy: Siemens Energy provides transformers, grid technology, and protection systems across transmission and distribution markets. It overlaps with SERGI through transformer and substation protection offerings, but as a broad incumbent rather than a specialist in mechanical last-line pressure-relief protection.

Direct peers

• Trench Group: Trench Group manufactures instrument transformers, coils, and specialized power transmission equipment for utilities and industrial customers. It is directly comparable to SERGI as a specialist supplier of transformer-related electrical apparatus used in T&D and grid applications, with overlapping customer bases.
• Maschinenfabrik Reinhausen (MR): MR is a global specialist in transformer accessories including on-load tap-changers, monitoring, and protection systems. It is directly comparable to SERGI as a specialized supplier of critical transformer components and lifecycle services to utilities and transformer OEMs focused on transformer reliability and protection.

Emerging players

• nVent (ERICO): nVent's ERICO business provides grounding, surge protection, and electrical protection solutions for industrial and utility infrastructure. It is comparable to SERGI as a protection-focused supplier addressing catastrophic failure risk in critical electrical infrastructure, though with broader electrical protection scope rather than mechanical transformer-specific focus.
• Industrial Electric Manufacturing (IEM): IEM manufactures power distribution equipment including switchgear, transformers, and substation solutions for utilities, data centers, and industrial customers. It is comparable to SERGI through its focus on critical power infrastructure and custom-engineered solutions for high-reliability applications.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

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 SERGI