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Precision Energy Components
for a Smarter Grid

Global manufacturer of high-performance current transformers, miniature voltage transformers, latching relays, and advanced metering solutions for smart grids, EV charging, and renewable energy systems.

Explore Products Our Technology
Current Transformer

Current Transformers

High-accuracy CTs with DC immunity for metering and protection.

Latching Relay

Latching Relays

Magnetic latching relays up to 120A for energy-efficient switching.

Miniature Voltage Transformer

Voltage Transformers

Miniature precision VTs for compact metering and monitoring.

Trusted Since 2000

Oswell E-Group Limited has been a leading global provider of high-quality metering components since 2000. With decades of engineering expertise, we deliver reliable, precision-engineered solutions for electrical meters, energy measurement systems, and protection equipment used in smart grids and new energy applications worldwide.

Our product portfolio includes current transformers, shunt sensors, latching relays, power transformers, inductors, transducers, LCD modules, split-core CTs, clamp-on CTs, leakage DC current sensors, and custom plastic parts — all manufactured to the highest international standards.

25+

Years in Industry

100+

Global Clients

Factory Automation

Advanced Manufacturing Technology

Our state-of-the-art production processes ensure unmatched consistency, reliability, and performance across all components.

Automatic Potting

Precision epoxy injection with vacuum degassing ensures bubble-free encapsulation and long-term reliability.

Auto Resistance Adjust

Real-time resistance detection and fine-tuning for optimal electrical performance consistency.

Auto Winding Process

Fully automated winding ensures uniformity, consistency, and high repeatability across all coils.

E-B Welding

High-precision electron beam welding for refractory materials with minimal deformation and oxidation.

Our Featured Products

Engineered for performance, reliability, and integration in modern energy systems.

DCT105W-C3 125A Current Transformer

DCT105W-C3

125A Current Transformer with DC Immunity

  • • High accuracy for CT metering
  • • Immune to DC offset
  • • Compact design
DCT107W4 80A Busbar CT

DCT107W4

80A Busbar Type CT with DC Immunity

  • • Busbar integration
  • • DC immunity
  • • Ideal for protection
SH617-90-12DT2 90A Relay

SH617-90-12DT2

90A Magnetic Latching Relay

  • • Low power consumption
  • • High reliability
  • • 12V DC coil
R618-120-12-S280-01 100A Relay

R618-120-12-S280-01

100A Latching Relay with Shunt

  • • Integrated shunt
  • • High current switching
  • • Energy efficient
PCT13-YX2A2 Mini VT

PCT13-YX2A2

Current Type Miniature VT

  • • Miniature footprint
  • • High insulation
  • • Stable output
PCT32-YX120V1P4 VT

PCT32-YX120V1P4

Voltage Type Miniature VT

  • • 120V input
  • • Precision voltage sensing
  • • Low phase error
OFLS Rogowski Coil

OFLS Series

Rogowski Coil

  • • Flexible design
  • • Wide frequency range
  • • Non-invasive measurement
SDQxxX Current Clamp

SDQxxX Series

Current Clamp

  • • Split-core design
  • • Easy installation
  • • High accuracy
View All Products

200+

Product Models

15+

Countries Served

99.8%

Quality Yield

24h

Support Response

Frequently Asked Questions

What are the advantages of latching relays?

Latching relays consume power only during switching, making them highly energy-efficient. They maintain their state without continuous power, ideal for battery-powered and smart metering applications.

Do you offer custom design services?

Yes, we provide OEM/ODM services for current transformers, voltage transformers, relays, LCD modules, and plastic components based on client specifications.

What is the lead time for samples?

Sample lead time is typically 7–10 working days. Mass production lead time varies based on order volume and product complexity.

Are your products compliant with international standards?

Yes, our products meet or exceed IEC, GB/T, and other relevant international standards for safety, performance, and reliability.

Get in Touch

Reach out for product inquiries, technical support, or partnership opportunities.

Phone: +86-21-68756810 / +86-21-68756890
Email: [email protected]
Fax: +86-21-68671885-16
Address: Rm.701-703, 738 Dongfang Road, Shanghai 200122, China

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