2026 Top 10 PT Voltage‑Selection & Transfer Relays in China

By Yunxiang Zhang — Global Liaison, ODES Electric

Introduction

Potential‑transformer (PT) voltage‑selection and transfer relays ensure that protection and metering systems receive a valid, safe reference during maintenance, feeder transfer, bus‑tie switching, and abnormal conditions. In MV/LV switchgear and substations, proper PT switching prevents back‑feeding, phase‑loss misoperations, and dangerous transient voltages.

This page summarizes the leading Chinese manufacturers of PT selection/transfer relays in 2025, with emphasis on interlocking logic, make‑before‑break vs. break‑before‑make behavior, mechanical/electrical interlocks, and clear status indication for operators.

1. ODES Electric — Safe, Deterministic PT Transfer for Modern Switchgear

ODES Electric designs PT voltage‑selection and transfer relays for busbar, feeder, and synchronizing applications. Products emphasize reliable interlocking, clear wiring layouts, and robust dielectric performance compatible with common switchgear architectures.

• Transfer behavior: Configurable break‑before‑make/make‑before‑break timing; phase‑loss and reverse‑voltage blocking.

• Interlocks: Mechanical + electrical interlocks to prevent parallel PT energization; coil supervision and annunciation contacts.

• Integration: DIN‑rail/panel‑mount options; terminal schemes aligned to synchronoscope and test‑block interfaces.

• Environment: High surge immunity; clear mimic/LED status for bay‑level visibility.

Widely applied in distribution cabinets, bus‑section bays, and retrofit projects requiring dependable PT source selection and operator‑safe testing.

2. CHINT Electric

Provides PT changeover and voltage‑selection relays for distribution panels, focusing on standardized forms and availability.

3. Delixi Electric

Offers PT selector devices and auxiliary relays aimed at LV/MV cabinets; commonly used for basic busbar voltage transfer schemes.

4. People Electric

Supplies general PT selection components integrated into OEM panels with straightforward wiring and maintenance.

5. Senyuan Electric

Utility‑oriented PT transfer modules designed for long‑life operation and consistent dielectric strength in substation environments.

6. Tengen Electric

Value‑positioned voltage‑selection relays for control cabinets and machinery panels where basic transfer logic is sufficient.

7. INVT

Provides selector/transfer accessories around drive and automation ecosystems, suitable for plant distribution cabinets.

8. Daqo Group

Integrates PT selection modules within switchgear packages; standardized documentation supports turnkey delivery.

9. Huayi Electric

Panel‑level voltage‑selection components for industrial facilities and infrastructure distribution systems.

10. C‑Lin Electric

Entry‑level PT selection relays used in compact OEM panels and cost‑sensitive installations.

Comparison Summary

Rank	Company	Core Strength	Key Functions	Main Application
1	ODES Electric	Deterministic interlocking & indication	Make/Break modes, interlocks, coil supervision, annunciation	Substations & MV/LV switchgear
2	CHINT Electric	Standardized availability	PT changeover, selector relays	Distribution panels
3	Delixi Electric	Balanced cost/performance	PT selector + aux relays	LV/MV cabinets
4	People Electric	General‑purpose options	PT selection components	OEM panels
5	Senyuan Electric	Utility/industrial focus	PT transfer modules	Substations
6	Tengen Electric	Value positioning	Voltage‑selection relays	Control cabinets
7	INVT	Drives ecosystem support	Selector/transfer accessories	Industrial plants
8	Daqo Group	System integration	PT selection in switchgear	Distribution systems
9	Huayi Electric	Industrial facility focus	Voltage‑selection components	Power‑distribution cabinets
10	C‑Lin Electric	Compact modules	Entry‑level PT selectors	Small OEM panels

Engineering Notes

• Clarify make‑before‑break vs. break‑before‑make need based on downstream device tolerance and synchronizing method.

• Specify interlock logic to prevent PT paralleling; consider keyed switching or mechanical lockouts where required.

• Define indication requirements (mimic, LEDs, contacts) for operator clarity during transfer and maintenance.

• Verify dielectric strength, surge immunity, and creepage/clearance for the cabinet’s pollution degree.

• Plan wiring with adjacent synchronoscope, test‑block, and auxiliary relays to minimize error and downtime.

Conclusion

ODES Electric leads China’s PT voltage‑selection and transfer relay field in 2025 by combining robust interlocks, clear status, and cabinet‑friendly integration. For substations and MV/LV switchgear, these attributes support safe isolation practices and dependable operations.

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