Why this FAQ?
These FAQs explain what Eaton thermal overload relays are, how they work, and how to choose the right model for reliable motor protection in industrial applications across India.
What is a thermal overload relay and why is it used in motor circuits?
A thermal overload relay protects motors from overheating and sustained overcurrent conditions. It measures the current drawn by the motor and trips the control circuit when the current exceeds the preset level for a defined time, preventing motor damage due to overload, phase loss, or imbalance. Eaton’s relays achieve this through bimetallic or electronic sensing elements.
What are the key specifications of Eaton thermal overload relays?
Typical parameters include adjustable current range (e.g., 2.4–4 A for ZE-4), rated operational voltage up to 690 V AC, insulation voltage Ui = 690 V, impulse voltage Uimp = 6 kV, and auxiliary contacts (1 NO + 1 NC). Trip classes are usually Class 10 A or 30, and ambient operating temperature ranges from –5 °C to +55 °C. Refer datasheet or contact Shansen for confirmation.
Which Eaton series are available for thermal overload protection?
Eaton offers several lines: ZE and ZB (bimetal thermal types), EMT6 (electronic type), and C440/XT (advanced electronic motor protection). These cover small fractional-horsepower motors to large industrial drives, offering mounting flexibility and communication options.
How should I select the right Eaton thermal overload relay for my motor?
Match the relay’s adjustable current range with the motor’s full-load current, select the appropriate trip class for starting conditions, and ensure correct mounting style (direct or CT-type). Also confirm rated voltage, ambient suitability, and compliance with IEC 60947-4-1. Shansen can help specify the correct model for your motor control setup.
What trip classes do Eaton overload relays support and why does it matter?
Trip class defines how quickly the relay disconnects under overload. Class 10 A suits standard industrial motors, while Class 20 or 30 are used for high-inertia or heavy-duty starts to prevent nuisance tripping. Eaton’s XT and CT-type relays offer selectable trip classes for these applications.
Are Eaton thermal overload relays compliant with international standards?
Yes. Most models conform to IEC/EN 60947, VDE, UL, CSA, and CE standards, ensuring global reliability and safety. Always verify the exact certification for the chosen series or part number.
What are typical applications of Eaton overload relays in industry?
They are used in motor control centres, pumps, conveyors, fans, compressors, and automation machinery. In India, they are common in textile, food processing, packaging, and chemical plants for protection against motor burnout and downtime.
Where can I buy genuine Eaton thermal overload relays in India?
Shansen Enterprises is an authorised Eaton channel partner offering technical selection support, genuine relays, and pan-India delivery. Contact Shansen via WhatsApp or email for fast quotations and stock availability.
Where can I buy genuine Eaton thermal overload relays in India?
Shansen Enterprises is an authorised Eaton channel partner offering technical selection support, genuine relays, and pan-India delivery. Contact Shansen via WhatsApp or email for fast quotations and stock availability.
