Zakład Produkcyjny Aparatury Elektrycznej

Name

Zakład Produkcyjny Aparatury Elektrycznej

Legal name

Zakład Produkcyjny Aparatury Elektrycznej Sp. z o.o.

Website

https://zprae.pl

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

51–100 employees

Short description

ZPrAE is a privately held Polish manufacturer, founded in 1995, of digital protection relays, busbar and breaker-failure protection systems, and auxiliary equipment for 400/220/110 kV power substations, serving PSE S.A., major Polish distribution operators, and industrial customers via direct B2B sales and in-house design and production.

Ownership category

akta.pro rank

Product category

Power System Protection Equipment Manufacturing

NAICS

Switchgear and Switchboard Apparatus Manufacturing (335313), Relay and Industrial Control Manufacturing (335314), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Switchgear & Switchboard Apparatus (3613), Industrial Instruments For Measurement, Display, And Control (3823), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro industry

PRIMARYIMAGAAAD

Protection, Control & Monitoring (Relays, RTUs, Fault Recorders, Condition Monitoring)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Power Generation & Grid Equipment (Transformers, Switchgear, Substations)

SECONDARYEUADACAH

Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components

Energy, Utilities & Environment/Electric Transmission & Distribution (T&D)/Substations, Switchgear & Protection Systems

SECONDARYEUADAAAF

Transmission Substations & High-Voltage Switchyards

Energy, Utilities & Environment/Electric Transmission & Distribution (T&D)/Transmission System Operators (TSOs) & High-Voltage Transmission

SECONDARYIMAGAEAA

Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Electrical Distribution & Wiring Devices (Panels, Breakers, Cables, Connectors)

Keywords

• Digital protection relays
• Busbar protection systems
• High voltage substations
• IEC 61850 automation
• Auxiliary relay manufacturing

Headquarters

HQ city

Siemianowice Slaskie

HQ country

Poland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Protection and Control Equipment Manufacturing: Design, production, and sale of proprietary protection relays, busbar protection systems, breaker failure protection, auxiliary relays, and related electronic equipment for high-voltage power substations. Products are sold as hardware units with associated firmware/software. Revenue is generated from unit sales to power utilities and grid operators.
2. Assembly and Installation Services: Secondary circuit assembly, post-assembly and commissioning testing, damage survey and repair, and project work for secondary circuits of power substations including protection systems, signalling circuits, energy metering systems, control and monitoring circuits, and auxiliary power supply switchgears. Prefabrication of fully equipped cabinet sets (protection cabinets, control cabinets, central signalling cabinets, metering cabinets).
3. Training Services: Design training for designers using cabinets and protection equipment, operation training for customers with ZPrAE protection devices on their facilities, and dedicated training tailored to client needs. Topics include busbar protection, breaker failure protection, and disturbance recorder operation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

ZPrAE designs, manufactures, and sells proprietary digital protection relays, busbar and breaker-failure protection systems, auxiliary relays, signaling devices, earth-fault monitoring systems, disturbance recorders, switching devices, and prefabricated cubicles for 400/220/110 kV high-voltage power substations. The company also delivers secondary-circuit design, assembly, commissioning, maintenance, and training services for Polish power utilities and industrial customers.

Product overview

ZPrAE (Zakład Produkcyjny Aparatury Elektrycznej Sp. z o.o.) is a Polish manufacturer of protection and control equipment for the power industry, operating since 1995. The product portfolio centers on digital protection relays for electrical substations at 110-400kV voltages. Core products include: TSL/TL series busbar and breaker failure protection systems (TSL-9r, TSL-11, TSL-6, TL-6r, TLH-5); the TZX-11 universal protection terminal platform configurable as TZU-11, TZP-11, TZS-11, TZT-11, TZL-11, TZO-11, TZZ-11; MSA series centralized signaling systems (MSA-9, MSA-6, MSA-12i, MSA-24i); SZR-9 automatic standby switching devices; KDZ-3 earth fault monitoring systems; RZS-9 disturbance recorders and ZRZ-28 event recorders; RE-Line auxiliary relay family with ~25 relay types; PROFIL-L cubicles; and the TMU-11 Merging Unit for IEC 61850 digital substations. ZPrAE also offers comprehensive services including secondary circuit design, assembly, commissioning, testing, and periodic protection equipment maintenance. The company has in-house design capabilities and modern production facilities in Siemianowice Śląskie.

Differentiator

Problem solved

Functional benefit

Brands

• RE-Line: Family of auxiliary relays for electric power automation systems, including approximately 25 different types of relays and supplementary equipment.
• TZX-11
• TSL-9r
• TSL-11
• MSA-9
• KDZ
• RFQ-8
• SZR-9
• RZS-9
• PROFIL-L

Products and services

• TSL-9r Digital Busbar / Breaker-Failure Protection Relay Digital protection system operating as busbar protection and/or breaker-failure protection for HV substations. Modular construction supporting IEC 61850 and IEC 870-5-103 communication over optical fiber; UCA IUG / AMA-CERT-Lab IEC 61850 conformance certified.
• TSL-11 Busbar / Breaker-Failure Protection Relay Protection system for single-busbar switchable substations serving up to 8 bays; can function as busbar protection, breaker-failure protection, or both. Features LCD touch screen and internal event/fault recorders.
• TSL-6 Busbar and Breaker-Failure Protection System Busbar protection designed for highest-voltage substations for quick and selective tripping, including integrated breaker-failure protection (LRW) for selective current disconnection.
• TZX-11 Universal Protection Terminal Platform Universal protection terminal with programmable logic configurable for multiple bay protection functions (TZU-11, TZP-11, TZS-11, TZT-11, TZL-11, TZO-11, TZZ-11). All configurations approved for use in PSE S.A. transmission grid.
• MSA-9 Digital Centralized Signaling System Centralized signaling device for power stations and substations featuring high-speed internal data exchange, event registration, and multi-color LED/RBG diode signaling.
• MSA-6 Digital Centralized Signaling Device Digital centralized signaling device for optical and acoustic signaling of protection operations, equipped with event recorder and remote communication capability.
• SZR-9 Automatic Stand-by Switching Device Automatic stand-by switching-on device for 400/230 V AC switchgears with supplemental/spinning reserve or diesel generator. Features LCD touch screen and event recorder.
• KDZ-3 Earth Fault Monitoring System Digital earth fault monitoring system for unearthed DC power supply circuits with selective fault location and event recording; modular family comprising KDZ-3 central system, KDZ-3JM measuring relay, KDZ-3W portable measuring unit, and KDZ-3C portable locator.
• RZS-9 Disturbance Recorder Disturbance recorder for analyzing power system fault causes, memorizing current/voltage values and binary signal statuses during fault periods.
• ZRZ-28 Event Recorder Event recorder for registration and monitoring of measurement circuits for electric energy settlement purposes with remote signaling capability.
• PROFIL-L Cubicles Cabinet structures (stiff three-dimensional design) for power distribution substations and industrial automation systems, produced with modern manufacturing enabling multiple construction variants.
• RE-Line Family of Auxiliary Relays Family of approximately 25 types of auxiliary relays for electric power automation systems, including fast switching relays (RSH-3, RSH-3S, RS-6), voltage monitoring relays (RUT-1/2/3), current monitoring relays (RJT-1/3), time delay relays (RT-22), bistable relays (RB-1, RBS-1/2), signalling relays (RMS-2, MSA series), control relays (RCW-3, RCDW-1, RPZ-1), and relay mounting racks.
• AZT-9 Autonomous Transformer Protection Relay Autonomous transformer protection relay operating in emergency situations with two independent power supplies (one from current transformers) and internal capacitor energy storage for tripping.
• TMU-11 Merging Unit Merging Unit converting analog (up to 8 voltages, 8 currents) and binary signals (96 inputs in 8 independent GOOSE frames) to IEC 61850-9-2 Sampled Values. Supports sampling at 4 kHz and 12.8 kHz, PRP/HSR redundant communication, and PTP time synchronization.
• MTT-12 Test Sockets Test sockets enabling safe and reliable control and monitoring of protections and verification of secondary circuits; available in versions 12.1, 12.2, and 12.3 with various subversions.
• RFQ-8 Energy Measuring and Registering System Measuring and registering system for energy measuring cabinets with up to 8 meters, including independent power supplies, event recorder, and impulse/voltage monitoring cards.
• RD-50 / RD-50-30 Load Resistor Sets Load resistor sets for ensuring proper operating conditions of current and voltage measuring transformers, including 3-resistor sets for 3-phase circuits and specialized versions for V-arrangements.
• MZT-924 Stabilized DC Power Supply Stabilized 24V DC power supply with over 240 W output power, capable of parallel operation for redundancy in protection and measuring devices.
• NP2P / ND2P / NT2P Overlay Switches Overlay switches for mounting on plates or TS-35 mounting bus, available in single, double, and triple versions.
• ZRPN-6 Current-Voltage Regulation Set Current-voltage regulation set for testing current and voltage circuits of power substations before energizing, enabling simultaneous voltage application and forcing currents in 3 phases.
• Secondary Circuit Assembly, Commissioning, Testing, and Repair Services Secondary circuit assembly, post-assembly and commissioning testing, damage survey and repair, and project work for protection systems, signalling circuits, energy metering systems, control and monitoring circuits, and auxiliary power supply switchgears. Includes prefabrication of fully equipped cabinet sets (protection cabinets, control cabinets, central signalling cabinets, metering cabinets).
• Training Services for Designers and Operators Design training for designers using ZPrAE cabinets and protection equipment, operation training for customers with ZPrAE protection devices on their facilities, and dedicated customer-tailored training. Topics include busbar protection, breaker-failure protection (LRW), SZR algorithm, transformer loading, and disturbance recorder operation.

Quantifiable outcome

• Products certified for use in PSE S.A. transmission grid at 400/220/110 kV
• +2 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Four partnerships are on record, tiered core.

• Komitet Automatyki Elektroenergetycznej (KAE) przy Stowarzyszeniu Elektryków PolskichcoreStrategic or Co-development Partner · 1 October 2025The Committee of Electroenergy Automation, part of the Polish Electrical Engineers Association, co-organizes the annual national conference 'Zabezpieczenia Przekaźnikowe w Energetyce' (Relay Protection in Power Engineering) together with ZPrAE. The conference is a key industry knowledge-sharing and networking platform.
• UCA International Users Group (UCA IUG)coreTechnology or Integration · 1 May 2019ZPrAE's TSL-9r protection relay with IEC-61850 communication protocol underwent testing at AMA-CERT-Lab GMBH independent laboratory and obtained a certificate signed by the UCA International Users Group. This certification confirms interoperability and compliance with the IEC 61850 standard for substation communication.
• AMA-CERT-Lab GMBHcoreTechnology or IntegrationIndependent testing laboratory that conducted IEC 61850 conformance testing for ZPrAE's TSL-9r protection relay. Testing resulted in UCA IUG certification for the product.
• PSE S.A. (Polskie Sieci Elektroenergetyczne)coreStrategic or Co-development PartnerPSE S.A. is Poland's transmission system operator. ZPrAE's products undergo testing at PSE's Protections Laboratory, and approved products receive certificates for use in PSE's transmission grid. This includes TZX-11 family, ESH-3, RUT-2, RUT-3, TSL-9r, TSL-11, and others.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Siemens: Multinational automation and energy giant with SIPROTEC protection relays and SICAM substation automation portfolio directly overlapping ZPrAE's TSL/TZX-11 offerings. Listed as a customer in ZPrAE testimonials (2002-2010) and competes for the same PSE S.A. and DSO contracts.
• ABB: Global power and automation major offering a full range of protection relays, switchgear, and substation automation systems at HV/MV levels. Competes with ZPrAE in Polish TSO/DSO tenders but as part of a much broader portfolio and global reference base.
• Eaton: US-based power management company offering protection relays, switchgear, and substation solutions. Competes in the same MV/HV protection-relay and substation-automation space as ZPrAE.
• GE Vernova: GE's power-grid spin-off providing UR-series protection relays, substation automation, and grid software. Competes with ZPrAE across the same IEC 61850-based protection and control segment for utility customers.
• Schneider Electric: Major provider of Sepam, Easergy, and Vamp protection relays plus substation automation under its EcoStruxure platform. Competes in Polish utility tenders across the same protection and control categories as ZPrAE.
• Hitachi Energy: Provider of RELION protection and control products, switchgear, transformers, and substation automation globally. Overlaps with ZPrAE's busbar protection (TSL), breaker failure (TL/LRW), and bay protection (TZX-11) product categories.

Direct peers

• Schweitzer Engineering Laboratories (SEL): US-based specialist in protection relays, fault recorders, and IEC 61850-based substation automation, closely matching ZPrAE's product scope. A direct competitor in digital protection relays for HV transmission and distribution applications globally.

Regional players

• Trafomec (formerly ASE): Polish-based manufacturer of power and dry-type transformers serving Polish utilities and industry. Comparable regional player addressing overlapping utility customers in Polish substation projects.
• Apator: Polish manufacturer of metering, switchgear, and power distribution equipment already referenced as a minor supplier to ZPrAE (4G10 cam switches for PS-xx modules). Comparable regional competitor in Polish electricity infrastructure markets.
• ZREW Transformatory: Polish manufacturer of power and distribution transformers based in Łódź. A Polish peer serving the same TSO/DSO customer base in substations, though focused on transformers rather than protection relays.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 Zakład Produkcyjny Aparatury Elektrycznej