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E-mail: info@greenwich.com.cn
Phone: +86-13806684830
Add: Jinsihe Village, Liushi Town, Yueqing, Zhejiang, China

Thermal Relay

Thermal Relay Overview

The Thermal Relay from GWIEC Electric offers dependable motor protection for industrial environments where overload conditions may occur. As a trusted manufacturer of low-voltage electrical components, we design our relays to safeguard electric motors by disconnecting circuits automatically when excessive current is detected. Each unit meets international standards such as IEC and CE, ensuring reliable performance and global compatibility.

Our relays integrate advanced overload protection with adjustable current settings and phase loss sensitivity. This makes them ideal for control panels and automation systems. Built for precision and durability, GWIEC thermal relays support long-term operational safety in demanding motor protection applications.

Key Features and Advantages

GWIEC’s thermal overload relays deliver consistent performance and reliable motor protection. Each relay uses high-quality bimetallic strips for precise trip characteristics, preventing motor damage during overload or phase loss. Temperature compensation ensures stable operation even under fluctuating ambient conditions.

  • Adjustable current settings from 0.1–100A for flexible motor protection

  • Phase loss sensitivity and temperature compensation for accurate performance

  • Manual and automatic reset options for user convenience

  • Compact design easily mounts with compatible GWIEC contactors

  • CE-certified components ensuring quality and safety compliance

These advantages make GWIEC relays a dependable choice for industrial automation systems, HVAC equipment, and other motor-driven machinery.

Product Range and Specifications

Our thermal relay range includes multiple models designed for different load capacities and operating environments. Each relay allows adjustable current calibration to ensure optimal motor protection. They are compatible with both AC and DC contactors, providing flexibility in control systems.

Model Type Current Range (A) Rated Voltage Trip Class Reset Type
TR Series 0.1 – 32 690V Class 10 Manual / Auto
TR-H Series 32 – 100 690V Class 10 / 20 Manual / Auto

Each model is engineered for long service life. They integrate seamlessly with GWIEC's AC/DC contactors, magnetic starters, and other control devices.

Applications and Compatibility

GWIEC Thermal Relays are widely used in motor control panels, automation systems, HVAC equipment, and machinery requiring precise overload protection. Their compatibility with GWIEC contactors and magnetic starters ensures easy installation and consistent performance.

These devices operate reliably under diverse environmental and load conditions, making them suitable for manufacturing plants, production lines, and energy-efficient systems. With robust construction and accurate tripping mechanisms, GWIEC relays deliver dependable protection essential for modern industrial automation.

How to Select the Right Thermal Overload Relay

Choosing the right thermal overload relay ensures optimal motor protection. Consider the following factors when selecting a model:

  • Motor rated current and operational duty cycle

  • Ambient temperature and environmental conditions

  • Required trip class and reset mode

  • Compatibility with existing contactors and control devices

Adjustable current settings allow precise alignment with motor full-load current. Temperature-compensated designs maintain accuracy under varying conditions. For best results, pair the relay with suitable GWIEC AC/DC contactors to ensure comprehensive protection and system reliability.

OEM/ODM and Service Support

As an experienced OEM relay manufacturer, GWIEC Electric provides customized thermal relay solutions to meet specific industrial requirements. We offer design flexibility, private labeling, and parameter adjustments for global clients seeking tailored protection devices. Our commitment to quality is backed by CE-certified production and a customer-first philosophy.

In addition to OEM/ODM services, we provide comprehensive technical support services for installation, configuration, and post-sales care. This ensures every relay operates efficiently throughout its service life.

FAQs about Thermal Relays

Q1: What is the purpose of a thermal relay?

Our thermal relays protect electric motors from overload by automatically disconnecting the circuit when excessive current is detected, ensuring safe and reliable operation.

Q2: How do I adjust the current setting on a thermal overload relay?

Use the adjustment dial to match the relay’s rated current to your motor’s full-load current. This ensures accurate and consistent protection.

Q3: Can GWIEC thermal relays be used with both AC and DC contactors?

Yes. Our relays are fully compatible with both AC and DC contactors, offering flexibility for diverse control systems.

Q4: What does temperature compensation mean in a thermal relay?

Temperature compensation maintains stable tripping performance even when ambient temperatures fluctuate, ensuring consistent protection.

Q5: Does GWIEC offer customized relay solutions?

Yes. We provide OEM/ODM customization to meet unique industrial application needs, supported by our global service and technical expertise.

For more information or to request a quote, contact GWIEC Electric — a professional manufacturer and supplier of high-quality Thermal Relays for industrial motor protection systems.


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 +86-577-62713996
 Jinsihe Village, Liushi Town, Yueqing, Zhejiang, China
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