Schneider Electric LR9G225 Electronic Thermal Overload Relay
Schneider Electric LR9G225 Electronic Thermal Overload Relay
Product Description:
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An Electronic Thermal Overload Relay is a precision protective device designed to safeguard electric motors and equipment from damage caused by overloads, phase loss, or unbalanced currents.
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Unlike traditional bimetallic overload relays, electronic versions use advanced current-sensing technology and microcontroller-based logic to deliver faster, more accurate protection.
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These relays are typically installed in motor control circuits and integrated with contactors, ensuring the motor is disconnected when abnormal conditions are detected—helping prevent overheating, downtime, and costly repairs.
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An Electronic Thermal Overload Relay is a modern, intelligent solution for protecting motors in mission-critical environments, offering superior accuracy, diagnostics, and adaptability over traditional thermal relays.
Product Specification:
| Network frequency | 30…60 Hz 100 Hz |
|---|---|
| Overvoltage category | III |
| Tripping threshold | 1.125 +/- 0.07 In conforming to IEC 60947-4-1 |
| Protection type | Ground fault protection – tripping time adjustment: 0…1 s – for alarm circuit conforming to IEC 60947-4-1 Ground fault protection – tripping time adjustment: 0…1 s – for alarm circuit conforming to UL 60947-4-1 Phase loss – tripping time adjustment: 0…4 s – for alarm circuit Phase imbalance – tripping time adjustment: 0…5 s – for alarm circuit conforming to IEC 60947-4-1 Phase imbalance – tripping time adjustment: 0…5 s – for alarm circuit conforming to UL 60947-4-1 |
| Local signalling | LED Trip indicator |
| Contacts type and composition | 1 NO + 1 NC |
| [Ith] conventional free air thermal current | 5 A |
| [Uc] control circuit voltage | 24…500 V AC 50/60 Hz 24…250 V DC |
| [Ue] rated operational voltage | 1000 V AC 50/60 Hz |
| [Uimp] rated impulse withstand voltage | 8 kV |
| Reset | Automatic reset Manual |
| Mechanical durability | 7000 cycles |
| Surge withstand | 4 kV |
| Electromagnetic compatibility | EMC immunity conforming to IEC 60947-4-1 Emission tests criteria A conforming to IEC 60947-4-1 Immunity to radiated radio-electrical interference – test level: 20 V/m conforming to EN/IEC 61000-4-3 Voltage dips and interruptions immunity test conforming to SEMI F47 |
| Connections – terminals | Power circuit: bar – busbar cross section: 25 x 6 mm Power circuit: lugs-ring terminals 1 185 mm² Control circuit: push-in 1 0.2…2.5 mm² – cable stiffness: solid stranded without cable end Control circuit: push-in 1 0.25…2.5 mm² – cable stiffness: flexible with cable end Control circuit: push-in 2 0.5…1.0 mm² with cable end |
| Tightening torque | 18 N.m |
| Mounting support | Direct on contactor Plate |
| Relay application | Motor protection |
|---|---|
| Network type | AC |
| Thermal overload class | Class 5E…30E conforming to IEC 60947-4-1 |
| Thermal protection adjustment range | 57…225 A |
