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This page explains how Overload Relay is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
A protective electrical device that automatically interrupts circuit current when it detects excessive load conditions to prevent motor damage.
Technical details and manufacturing context for Overload Relay
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Insulation Voltage | 690 V | Maximum voltage the relay can withstandIEC 60947-4-1 |
| Rated Operational Voltage | 24–690 V AC | Range for motor circuit applicationIEC 60947-4-1 |
| Current Setting Range | 0.1–630 A | Adjustable overload trip thresholdIEC 60947-4-1 |
| Trip Class | 10A–30 | Defines trip delay under overloadIEC 60947-4-1 |
| Frequency | 50–60 Hz | Operating frequency rangeIEC 60947-4-1 |
| Operating Temperature | -20–70 °C | Ambient temperature range for reliable operationIEC 60947-4-1 |
| Degree of Protection | IP20–IP65 | Higher IP for harsh environmentsIEC 60529 |
| Contact Rating | 5–10 A | AC-15 utilization category for auxiliary contactsIEC 60947-5-1 |
| Reset Time | 2–60 s | Time for manual or automatic reset after trip |
| Mechanical Endurance | 100000 operations | Number of operations without mechanical failureIEC 60947-4-1 |
| Electrical Endurance | 10000 operations | Number of operations under rated loadIEC 60947-4-1 |
| Weight | 0.1–5 kg | Varies with current rating and enclosure |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is essential for the following industrial systems and equipment:
| pressure: | N/A (electrical device, not pressure-rated) |
| other spec: | Current Range: 0.1-630A typical, Voltage: up to 690V AC, Trip Class: 10, 20, 30 (motor start time tolerance) |
| temperature: | -20°C to +60°C (operating ambient) |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
4 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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An overload relay protects an electric motor from damage due to excessive current draw. It monitors the motor current and opens its contacts to interrupt power when an overload condition is detected, preventing overheating and potential motor failure.
The two main types are thermal and magnetic. Thermal relays use bimetallic strips that bend with heat from overcurrent, while magnetic relays use electromagnetic coils that trip at specific current levels. Both serve the same protective function but operate on different principles.
Selection requires matching the relay's current setting range to the motor's full-load current, considering the rated operational voltage, frequency, and ambient temperature. Also, verify the trip class to ensure the relay provides appropriate protection without nuisance tripping. Always consult the manufacturer's data and standards like IEC 60947-4-1.
Regular inspection for signs of overheating, mechanical wear, or contact erosion is recommended. Test the trip function periodically and ensure the reset mechanism operates correctly. If the relay trips frequently, investigate the cause, such as motor overload or supply voltage issues. Replace the relay if it fails to trip or shows damage.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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