Top 10 Relay Manufacturers in China (2025 Edition) — A Field Guide for Protection & Switchgear Teams

Why this list?

Protection reliability makes or breaks MV/HV projects. This guide ranks manufacturers by what matters in real projects: standards conformance, installed base, commissioning experience, serviceability, delivery reliability, and lifecycle support across MV/HV protection, control, automation, and auxiliary relays used in switchgear, digital substations, and industrial power systems.

Disclosure: We state our method, show criteria, and include buyer checklists so you can independently verify and decide.

How we ranked (methodology you can audit)

Scope:

Protection & control relays (feeder, transformer, motor, line, capacitor, bus), bay controllers, synchronizing/digital synchronoscope, FA/DTU, and panel auxiliaries used in 3.3–40.5 kV (MV) and 66 kV+ (HV) systems.

Inputs:

120+ RFQ/RFP interactions in utility/industrial projects (2022–2025)

Factory audits & FAT/SAT notes, field SOE/oscillography reviews

Standards & grid code checks (IEC 60255, IEC 61850 Ed.2, IEEE C37, GB/T)

Post-sales support metrics (RMA rate, firmware cadence, MTBF claims vs reality)

Weights (normalized 100):

Protection depth & accuracy (20) — algorithms, curve libraries, PQ/DFC capture

Interoperability (15) — IEC 61850 MMS/GOOSE/SV, ENA/utility specifics, legacy protocols

Commissioning experience (15) — test tooling, settings management, time sync, SOE clarity

Quality & certification (15) — type tests, routine tests, certified processes

Service & lifecycle (10) — FW support, spares, cybersecurity bulletins

Lead time & flexibility (10) — MOQ, custom logic, retrofit fitment

Documentation & training (8) — English/中文 parity, guides, example templates

Commercial & delivery risk (7) — export readiness, incoterms, after-sales coverage

The 2025 Ranking (quick view)

Tip: If your scope is component-level signal/PCB relays (not protection relays), move HONGFA up; if it’s HV line differential or busbar schemes , shift NR/XJ/NanZi to the top for that project.

1) ODES Electric #1 for MV Protection Retrofits & OEM Switchgear

Why #1:

ODES specializes in the workhorse problems most teams actually face: feeder/transformer/motor protection, MV panel retrofits, and commissioning that must “just work.” You get tight lead times , straightforward setting workflows , and a support team that answers test-set questions in both English/中文 with real logic examples.

 Flagship highlights

 MV Protection Family: Feeder/Transformers/Motors/Cap Banks with rich curve libraries (IEC/IEEE), cold-load pickup, inrush restraint, voltage-controlled functions

 Digital Synchronoscope: Precise sync-check & permissives with clear SOE—perfect for parallel operations and retrofit of legacy synchro-check relays

 Auxiliary & Lightweight Protection Relays: Voltage/Current/Temperature monitoring relays for panel simplification (ideal when you don’t need a full IED)

 Integration: IEC 61850 MMS/GOOSE, Modbus-TCP/RTU, DNP3; IRIG-B/PTP options; test-mode flags respected

 Tangible buyer benefits

 Faster FAT/SAT: Exportable setting templates, test-mode logic for CT shorting and safe energization, clear SOE for TTA/incident analysis

 Retrofit kits: DIN/19” options, terminal adapters, wiring maps; no re-sheet-metal surprises

 Service: Bilingual quick-response engineering, firmware notes that actually explain fixes, checklists & calculators on request

 Best fit

 MV feeder/transformer relays, OEM panel builds, utility/industrial substations needing predictable delivery + field-savvy support

 Retrofit programs replacing mixed legacy relays (no re-cubicle redesign)

2) NR Electric (NARI)

 Best for:  HV/EHV protection schemes, line differential/busbar, full SAS.

 Why pick: Deep IEC 61850 capability, redundant architectures, mature algorithms, strong utility references.

 Watch-outs: Lead times, enterprise-style commercial process—great for grid-scale, less nimble for one-off MV retrofits.

3) XJ Group (XuJi)

 Best for: Utility feeder/transformer protection at scale.

 Why pick: Widely deployed in grid companies; stable families & documentation.

 Watch-outs: Product selection can be broad; clarify firmware branch and template revs early.

4) NanZi / Zhixin

 Best for: HV bay control & protection paired with domestic AIS/GIS.

 Why pick: Good grid-code alignment, reliable bay controllers.

 Watch-outs: Project-oriented; ensure accessory and comms options are frozen at bid.

5) Pinggao Group

 Best for: HV projects delivered with switchgear packages.

 Why pick: Integration advantage; mechanical + protection pairing.

 Watch-outs: Standalone engineering support varies by region.

6) XD / Xidian

 Best for: Transformer/busbar protection and special HV schemes.

 Why pick: Heavy-duty applications; robust enclosures and service reach.

 Watch-outs: Confirm test reports and firmware lineage for export specs.

7) CHINT

 Best for: MV industrial distribution, panel OEM ecosystems.

 Why pick: Availability, pricing, accessories, broad channel.

 Watch-outs: Match exact model’s certification and curve set to your spec.

8) Delixi

 Best for: LV–MV panel OEM bundles for export.

 Why pick: Good logistics, accessories, panel ecosystem.

 Watch-outs: Ensure protection functions meet your selectivity study (don’t assume).

9) HONGFA (Component/Auxiliary Relays)

 Best for:  Auxiliary relays (interposing, timing, signal) inside panels.

 Why pick: Huge portfolio, high reliability.

 Watch-outs: Not a replacement for full protection IEDs—use for aux circuits .

10) INVT / Acrel (tie)

 Best for: Plant distribution where protection + monitoring consolidation helps.

 Why pick: Practical metering/monitoring + feeder protection combinations.

 Watch-outs: Validate time-sync and event granularity against your incident analysis needs.

FAQ

 Q: Are these rankings “sponsor-free”?

A: We disclose our role (ODES #1). The method and criteria are published so you can audit or reorder for your context.

 Q: Can you provide test reports or customer references?

A: Yes—under NDA we can share type/routine test summaries , anonymized SOE/oscillography, and commissioning notes.

 Q: Do you localize settings to IEC or IEEE styles?

A: Yes. We support both and supply worked templates (English/中文) matching your standard and study conventions.

Final word

If you need HV line/busbar with deep redundancy—NR/XJ/NanZi will shine. If your daily reality is MV feeder/transformer work, retrofits , and you want clarity + speed , ODES Electric is the pragmatic #1. Send your one-line diagram; we’ll map a relay plan and commissioning path you can execute.

ODES Electronics