EFEN sp. z o.o.

What EFEN sp. z o.o. does

EFEN sp. z o.o. is a privately held Polish limited liability company (KRS 0000132217, share capital 2.2 million PLN) headquartered in Siemianowice Śląskie with a customer-facing office in Czeladź. The company designs, manufactures, and sells electrical power-distribution safety equipment — NH low-voltage knife fuses (sizes 000 to 4a in gG, gF, gTr, and gR characteristics), HH medium-voltage fuses (6/12 kV and 10/24 kV), busbar-mounted and box-type fuse switch-disconnectors (NSL E3, SILAS, NT-IN), low-voltage current transformers (5A–5000A primary), metal-oxide surge arresters (ONA-2, NA), distribution cabinets (RONDO), DC UPS fuses, and the newly added E3-DMM-5T-2 panel analyzer. Products are IEC- and DIN-compliant (VDE 0636, EN/IEC 60947-3, DIN 43620/1) and certified under DIN ISO 9001, DIN ISO 14001, OHSAS 18001, and AEOF; the company holds a granted patent on the SILAS reversible cable-connection system.

The company operates a sales-led go-to-market built on four regional sales managers covering all Polish voivodeships, supported by a Customer Service department, a Technical Department, and a B2B-only e-commerce storefront (sklep.efen.com.pl) accessible exclusively to registered entrepreneurs. An export department handles non-Polish inquiries via [email protected], with the corporate site available in Polish, Russian, English, German, Slovak, and Chinese. Revenue is generated through direct unit-priced B2B sales of electrical safety components (typical price points 29–727 PLN net per item) to industrial plants, switchgear manufacturers, electrical installers, energy distribution utilities, and infrastructure operators. End customers are segmented across industrial, energy/power, and infrastructure verticals, with the company's competitive thesis centered on nearly 100 years of brand heritage, complete single-source product portfolio, and Smart Grid Ready interoperability (Modbus-equipped ESU electronic fuse monitoring).

EFEN is a small specialty manufacturer reporting only ~10 employees, with no disclosed revenue, no external funding rounds, and no parent company. Strategic activity in the input period is concentrated in product-line extensions (E3-DMM-5T-2 analyzer, HH-VL WBP20 fuses, EFEN-TPS UPS disconnectors, PV system components) and the 2009 absorption of the Petereins LT LU switching-device line, together with multilingual web/export-channel buildout suggesting internationalization intent. Geographic operations remain anchored in Poland, with the e-commerce storefront delivering only domestically.

Name

EFEN sp. z o.o.

Legal name

EFEN sp. z o.o.

Website

https://efen.com.pl

Company type

Private

Founded year

1930

Operating status

Operating

Headcount range

1–10 employees

Short description

EFEN sp. z o.o. is a privately held Polish manufacturer of electrical power-distribution safety equipment — NH/HH fuses, fuse switch-disconnectors, current transformers, surge arresters, and Smart Grid Ready monitoring modules — selling B2B to industrial, energy, and infrastructure customers via regional sales managers and a B2B e-commerce storefront.

Ownership category

akta.pro rank

Product category

Electrical power distribution safety equipment

NAICS

Switchgear and Switchboard Apparatus Manufacturing (335313), Power, Distribution, and Specialty Transformer Manufacturing (335311), Relay and Industrial Control Manufacturing (335314)

SIC

Switchgear & Switchboard Apparatus (3613), Electrical Industrial Apparatus (3620), Power, Distribution & Specialty Transformers (3612), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Circuit Protection Devices (MCBs, MCCBs, ACBs, fuses, RCD/GFCI, surge protection) (IMAGAEAB)

akta.pro secondary industries

Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components (EUADACAH), Metering & Grid Measurement (Smart Meters, CT/VT, PQ Meters) (IMAGAAAH)

Keywords

• Low voltage fuses
• Fuse switch-disconnectors
• Current transformers
• Surge protection devices
• Medium voltage fuses

Headquarters

HQ city

Siemianowice Śląskie

HQ country

Poland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Electrical Safety Equipment Manufacturing and Sales: EFEN designs, manufactures, and sells electrical distribution safety equipment including fuse inserts, switch disconnectors, fuse bases, current transformers, surge protectors, and distribution cabinets. Revenue is generated through direct sales, an e-commerce platform (sklep.efen.com.pl), and regional sales managers. Pricing is B2B per-unit/unit-based. The company serves industrial plants, switchgear manufacturers, electrical installers, and energy distribution utilities.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

EFEN designs, manufactures, and sells a one-source system of electrical power distribution safety equipment, ranging from low-voltage NH fuse inserts (sizes 00 to 4a), busbar-mounted (NSL E3) and box-type (SILAS, NT-IN) fuse switch-disconnectors, low-voltage current transformers (NW series), medium-voltage HH fuses (up to 40.5 kV), metal-oxide surge arresters (ONA-2, NA), and modular distribution cabinets (RONDO). Its Smart Grid Ready solutions integrate electronic fuse status monitoring (ESU) with Modbus communication for industrial plants, switchgear manufacturers, electrical installers, utilities, and infrastructure operators across Poland and selected international export markets.

Product overview

EFEN sp. z o.o. is a manufacturer of electrical distribution safety systems with nearly 100 years of experience. The company offers a comprehensive portfolio of products organized into several categories: (1) Fuse systems including NH low voltage knife fuses (sizes 000 to 4a) with gG, gF, gTr, and gR characteristics; HH medium voltage fuses (3.0-40.5 kV); DC fuses for UPS; and D installation fuses; (2) Switchgear including NSL E3 busbar-mounted fuse disconnectors (Smart Grid Ready), SILAS box-type fuse disconnectors, and NT-IN horizontal disconnectors; (3) Measurement and monitoring including NW current transformers (5A-5000A range), E3-DMM-5T-2 analyzers, and E3-LE-03MQ CT energy meters; (4) Distribution systems including 60mm busbar systems, RONDO distribution cabinets, and grounding equipment; (5) Surge protection including ONA-2 low voltage arresters and NA overhead line arresters; (6) Smart Grid solutions with ESU electronic fuse monitoring and Modbus communication modules. The product line is designed for industrial, infrastructure, and power sector applications according to IEC and DIN standards.

Differentiator

Problem solved

Functional benefit

Brands

• NSL E3: Busbar fuse disconnectors with modular, smart-grid-ready design for sizes NH00 to NH3 (160A to 630A).
• SILAS
• NT-IN
• RONDO
• NSL NL
• NW
• HH-VL
• ONA-2
• E3-DMM-5T-2
• E3-LE-03MQ CT

Products and services

• Low-Voltage NH Fuse Inserts Complete system of NH knife-type power fuses (low voltage) with gG, gF, gTr, and gR characteristics for cable/overhead line protection, fast-acting protection, transformer protection, and semiconductor protection, compliant with DIN, VDE, and IEC standards. Designed for switchgear manufacturers, electrical installers, industrial plants, and energy distribution companies.
• Medium-Voltage HH Fuse Inserts Medium-voltage fuses for rated voltages 6/12 kV, 10/24 kV, and 3.0 kV to 40.5 kV providing reliable protection for transformers, capacitors, and motors; usable indoors, outdoors, and immersed in oil chambers; limit fault currents within milliseconds by suppressing peak current values. Targeted at utilities, energy distribution, and industrial applications.
• NSL E3 Busbar-Mounted Fuse Switch-Disconnectors New-generation vertical-design fuse switch-disconnectors for NH fuse links (sizes NH00 to NH3, 160A to 630A) with unified adapters for any measuring instrument, expandability at any time, and busbar mounting versions for 60mm, 100mm, and 185mm spacing; up to 1200 mechanical and 200 electrical cycles; Smart Grid Ready compatible with optional ESU monitoring. For switchgear manufacturers and industrial power distribution.
• SILAS Box-Type Fuse Switch-Disconnectors Box-type fuse disconnectors with easily removable covers maintaining protection even when removed, sliding inspection windows for voltage checking, and a patented system for changing cable connection orientation from top output to bottom output and vice versa; available in sizes 000, 00, 1, 2, 3, 4a. Targeted at switchgear manufacturers and industrial installations.
• LT LU Switchgear (Load Break Switches) Switching devices series acquired from Petereins, including load break switches for NH fuses compliant with DIN and BS standards, available in 3-pole, 4-pole, and Bypass versions with 6 or 8 poles. Targeted at switchgear manufacturers and installers.
• EFEN-TPS UPS Disconnectors and Fuses DC systems disconnectors with fuses for constant voltage power supplies up to 80V, using special high current density fuses for compact construction. Designed for UPS and battery-backed power systems.
• NW Low-Voltage Current Transformers Low-voltage current transformers for current measurement and overcurrent protection of electricity meters, including window-type (PSA, EPSA, PSR), busbar-type (PSW), and special versions for NSL E3 disconnectors; configurable primary current 5A to 5000A, secondary 1A/5A, with adjustable power, accuracy class, and safety factor. Manufactured in-house at EFEN.
• 60mm Busbar System 60mm busbar system offering compact external dimensions, a unified 32mm mounting depth, and compatibility with SILAS fuse disconnectors and the D system, providing diverse applications and increased flexibility for distribution panel builders.
• RONDO Distribution Cabinets Elegant round distribution cabinets for stationary and mobile power distribution points with modular construction, suitable for outdoor events and harsh weather conditions up to 32A, including use as local power distribution network nodes and backup power systems.
• ONA-2 Low-Voltage Surge Arresters Metal-oxide varistor (MOV) based surge limiters in durable weatherproof polymer housings with nanosecond response time, low residual voltage, and IP54 protection rating, providing protection against overvoltages from switching operations, earth faults, short circuits, or lightning strikes.
• NA Surge Arresters for Overhead Power Lines Surge arresters for overhead power lines at 280V and 500V with nominal discharge currents of 5 kA and 10 kA, featuring metal-oxide varistors in ceramic housings with nanosecond response time, used by utilities for line protection.
• ARCUS Three-Phase Grounding Devices 3-phase portable grounding devices for earthing low-voltage disconnectors and fuse bases from size 00 to 4a, including D-system sockets with E27 and E33 threads, used by installers and maintenance crews during servicing.
• E3-DMM-5T-2 Multifunctional Panel Analyzer Multifunctional universal panel indicator for comprehensive monitoring of single-phase or three-phase power line parameters, enabling high-precision measurement of all main network parameters for industrial, infrastructure, and energy distribution monitoring applications.
• E3-LE-03MQ CT Energy Meter Electric energy consumption meter with CT (current transformer) measurement capability for commercial and industrial metering applications.
• Measuring Devices Portfolio Range of measuring equipment including panel indicators and energy meters for power distribution monitoring, supplying electrical installers and industrial customers with visibility into network parameters.
• Smart Grid Interface Module (Modbus) Smart Grid interface module based on Modbus communication enabling remote monitoring and integration of EFEN disconnectors into building/grid automation systems for modern power networks.
• HH-VL WBP20 Medium-Voltage Backup Fuses Series of medium-voltage backup fuses designed to protect instrument transformers (WBP20 designation), available in multiple amperage ratings (0.5A, 1A, 2A, 3.15A) with 310mm length, used in utility and industrial medium-voltage protection circuits.
• Fuse Handles and Blade Closers (Accessories) Wide range of accessories for fuses and switching devices including fuse extraction handles and blade closers, compliant with VDE 0636 T201 and IEC 60269-2-1, for use by electrical installers servicing NH fuse systems.
• Photovoltaic (PV) System Components Photovoltaic system components and protective solutions for reliable solar power installation protection, supporting commercial and industrial PV integrators.

Quantifiable outcome

• HH-VL medium-voltage fuses limit fault currents within milliseconds by suppressing peak current values, preventing damage to downstream equipment
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Littelfuse: U.S.-based manufacturer of circuit protection products including high-power fuses, fuse holders, and surge protective devices. Directly comparable to EFEN across industrial, energy, and renewables end markets.
• Mersen: Global specialist in fuses, surge protection, and power transfer safety products for low- and medium-voltage applications. Closest direct peer to EFEN, competing head-to-head in NH/HH fuse links and fuse holders sold into industrial, energy, and infrastructure customers.
• Hager: European specialist in low-voltage distribution solutions including fuse disconnectors, modular DIN-rail devices, and distribution cabinets. Directly competes with EFEN's SILAS and NSL disconnectors and RONDO cabinets in installer and panel-builder channels.
• ETI: Slovenian specialist manufacturer of fuses, fuse disconnectors, and installation protection devices serving CEE and Western European markets. Highly comparable as a regional European fuse specialist competing for similar installer and OEM accounts.
• Eaton (Bussmann series): Eaton's Bussmann product line is one of the largest global fuse portfolios, covering NH/IEC fuse links, fuse disconnectors, and surge protection. Directly competes with EFEN in industrial and utility fuse applications.

Broad incumbents

• ABB: Global incumbent offering a full low- and medium-voltage portfolio including switchgear, protection relays, and fuse-based solutions. Competes with EFEN where customers demand full-scope distribution packages rather than specialty protection components.
• Siemens: Broad electrical equipment manufacturer with a comprehensive fuse, switchgear, and power distribution portfolio. Overlaps with EFEN in industrial and infrastructure projects but competes as a systems integrator rather than a fuse specialist.
• Legrand: Major European manufacturer of electrical and digital building infrastructure, including protection devices and distribution cabinets. Adjacent competitor to EFEN in commercial/infrastructure low-voltage distribution.
• Schneider Electric: Global leader in energy management and low-voltage distribution, with products including fuse disconnectors, surge protection, and distribution cabinets. Competes broadly with EFEN's portfolio via the Merlin Gerin and Square D brands.

Others

• Terasaki Electric: Japanese manufacturer of low- and medium-voltage circuit breakers and switchgear, which appears to be referenced through EFEN's website as Terasaki.pl. Not a direct fuse competitor but an adjacent protection-device maker with an apparent distribution or partnership relationship with EFEN in Poland.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCQMs5rZBunAws0kQEKWcaXw
• LinkedInlinkedin.com/company/efen-sp-z-o-o

Compliance13 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 EFEN sp. z o.o.