Oez S.r.o.

What Oez S.r.o. does

OEZ s.r.o. is a Czech-based manufacturer of low-voltage electrical protection equipment, founded in 1941 and headquartered at Šedivská 339, Letohrad, Czech Republic. The company produces a comprehensive portfolio organized into five primary hardware lines: Minia (modular protection devices including circuit breakers, residual current devices, arc fault detectors, and surge protectors), 3VA (compact circuit breakers up to 1250A with thermomagnetic and electronic releases), 3WA (air circuit breakers up to 6300A for industrial power distribution), Varius (fuse systems including semiconductor protection inserts), and Distri (distribution and switchgear cabinets including DistriTon, DistriSet, and DistriBox). Supporting software includes the Sichr calculation program for design and verification of TN-C, TN-C-S, and IT networks, the OEZ Configurator for product selection, and OEZ-CAD standardized drawing packages. Add-on modules cover measurement, communication, and automatic transfer switches.

Since 2007, OEZ has operated as a wholly-owned subsidiary of Siemens AG, and the association has modernized its production facilities to one of the most modern in the Czech Republic. With more than 1,500 employees, the company ranks among the largest employers in its region. Revenue is generated through hardware sales distributed via two channels: electrical wholesale distributors serving mid-market installers and contractors, and direct sales to enterprise-level industrial customers requiring complex protection solutions. Customer segments span the industrial sector (manufacturing plants, power generation, heavy industry), electrical installation contractors, and residential installations. Pricing is not publicly disclosed; quotes are obtained through direct contact or authorized distributors. The company is privately held and its financial results are consolidated within Siemens AG's reporting.

Name

Oez S.r.o.

Legal name

OEZ s.r.o.

Website

https://oez.cz

Company type

Private

Founded year

1941

Operating status

Operating

Short description

OEZ s.r.o. is a Czech-based manufacturer of low-voltage electrical protection devices — including modular, compact, and air circuit breakers, fuse systems, and distribution cabinets — serving industrial facilities, electrical installation contractors, and residential installations. Operating as a Siemens AG subsidiary since 2007 with over 1,500 employees.

Ownership category

akta.pro rank

Product category

Low-voltage electrical protection equipment

NAICS

Electrical Equipment Manufacturing (33531), Electrical Equipment, Appliance, and Component Manufacturing (335)

SIC

Electrical Industrial Apparatus (3620), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

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

akta.pro secondary industry

Medium-Voltage Distribution Components (MV breakers, disconnects, reclosers, MV terminations & joints) (IMAGAEAL)

Keywords

• Low-voltage circuit protection
• Electrical protection devices
• Modular circuit breakers
• Industrial switchgear equipment
• Fuse protection systems

Headquarters

HQ city

Letohrad

HQ country

Czechia

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware sales: Sale of low-voltage protection devices including modular circuit breakers, compact circuit breakers, air circuit breakers, fuse systems, and distribution cabinets. Products are sold directly and through distribution channels to industrial and commercial customers.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

OEZ s.r.o. designs, manufactures, and sells low-voltage electrical protection devices and distribution equipment for industrial, commercial, and residential installations. The portfolio spans modular circuit breakers (Minia), compact circuit breakers (3VA), air circuit breakers up to 6300A (3WA), fuse systems (Varius), and distribution/switchgear cabinets (Distri). Software tools (Sichr calculation program, OEZ Configurator, OEZ-CAD) are provided alongside the hardware to support design, specification, and configuration.

Product overview

OEZ s.r.o. is a manufacturer of low-voltage electrical protection equipment with 85 years of tradition, now part of the Siemens group since 2007. The company offers a comprehensive portfolio organized into hardware product lines (Minia modular devices, 3VA compact circuit breakers, 3WA air circuit breakers, Varius fuse systems, Distri distribution cabinets) supplemented by measurement and communication add-ons (Sivacon 8PS busbar systems, transfer switches, network analyzers). Software support includes the Sichr calculation program for network design, OEZ Configurator for product selection, and OEZ-CAD drawing packages. The offering follows a platform-plus-modules architecture where core protection device families (Minia, 3VA, 3WA, Varius) serve as the primary product lines, with specialized add-on modules for specific applications and supporting software tools for design and configuration.

Differentiator

Problem solved

Functional benefit

Brands

• Minia: Modular devices product line
• 3VA
• 3WA
• Varius
• Distri

Products and services

• Minia Modular Devices (Modulární přístroje Minia) Range of modular electrical protection devices for low-voltage circuits, including circuit breakers, residual current devices (RCDs), arc fault detection devices (AFDDs), surge protectors, and switching devices in standardized module form factors for residential and commercial installations.
• 3VA Compact Circuit Breakers (Kompaktní jističe 3VA) Compact molded-case circuit breakers up to 1600A for industrial applications, featuring thermomagnetic and electronic overload releases with various breaking capacities, line/motor/generator protection configurations, and communication options.
• 3WA Air Circuit Breakers (Vzduchové jističe 3WA) High-capacity air circuit breakers up to 6300A for industrial power distribution, with electronic overcurrent releases, advanced protection and monitoring capabilities, and sizes from 2500A to 6300A.
• Varius Fuse Systems (Pojistkové systémy Varius) Comprehensive fuse systems including disconnectors, fuse holders, and power fuse inserts for protecting semiconductor devices and medium-voltage applications, including high-voltage fuses.
• Distri Distribution and Switchgear Cabinets (Rozvodnicové a rozváděčové skříně Distri) Distribution and switchgear cabinets including DistriTon, DistriSet distribution boards and DistriBox enclosures, with busbar systems for electrical installations in commercial and industrial buildings.
• Sivacon 8PS Busbar Systems (Přípojnicové systémy Sivacon 8PS) Busbar systems from the Siemens Sivacon 8PS family for power distribution in commercial and industrial buildings.
• Automatic Transfer Switches (Záskokové automaty) Automatic transfer switches for emergency power supply systems, enabling seamless switching between primary and backup power sources.
• Sichr Calculation Program (Výpočtový program Sichr) Calculation software for design and verification of TN-C, TN-C-S and IT radial networks at all standard voltage levels, containing databases of OEZ protective and switching elements.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• SiemenscoreStrategic or Co-development Partner · 1 January 2007OEZ has been part of the Siemens group since 2007. This partnership has enabled OEZ to become one of the most modern production facilities in the Czech Republic, benefiting from Siemens' global technology standards and manufacturing expertise. The association has enhanced OEZ's product development capabilities and market reach.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Siemens: Parent of OEZ and itself a major manufacturer of low-voltage protection devices (SENTRON, 3VA, 3WA portfolios). While Siemens is OEZ's owner, it also competes globally in adjacent low-voltage product segments and channels.
• Rockwell Automation: Industrial automation incumbent offering motor protection, circuit protection and power distribution products (Allen-Bradley). Comparable to OEZ in industrial-segment circuit protection and motor starters.
• Mitsubishi Electric: Diversified electrical equipment manufacturer with low-voltage circuit breakers and protection devices comparable to OEZ's 3VA and 3WA ranges, especially in industrial applications.

Emerging players

• Noark Electric: Chinese-owned low-voltage electrical brand targeting European and global markets with modular protection devices and circuit breakers. Comparable to OEZ's Minia range on price/feature tradeoffs.
• CHINT: Chinese low-voltage electrical manufacturer rapidly expanding into European markets with competitive modular breakers, RCDs and distribution products. Competes with OEZ on price in commodity protection SKUs.

Direct peers

• Eaton: Global player in low-voltage power distribution and circuit protection (xEffect, NZM, IZM series). Competes directly with OEZ in compact and air circuit breakers, RCDs and modular DIN-rail devices.
• Hager: European specialist in modular protection devices, distribution boards and wiring accessories for residential and light commercial. Direct competitor to OEZ Minia and Distri ranges, especially in DACH/CEE installer channels.
• Schneider Electric: Global leader in low-voltage electrical distribution and circuit protection (Square D, Merlin Gerin brands). Directly competes with OEZ's Minia, 3VA, 3WA and Varius ranges in industrial, commercial and residential protection devices worldwide.
• ABB: Major manufacturer of low-voltage circuit breakers, RCDs, surge protection and modular devices (System pro M, S200, Tmax ranges). Competes head-to-head with OEZ in industrial and commercial protection, including across CEE markets.
• Legrand: French electrical and digital building infrastructure group with extensive low-voltage protection and distribution product lines. Overlaps significantly with OEZ's protection and distribution cabinet portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/user/oezletohrad
• Facebookfacebook.com/OEZ.Letohrad
• LinkedIncz.linkedin.com/company/oez-s.r.o.
• Instagraminstagram.com/oezletohrad

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Oez S.r.o.