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TeSys LR9 – LR9D / LR9D 
Schneider LR9F7579 | TeSys LRF – electronic thermal overload relay – 300…500 A – class 20
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CompareSchneider LR9F7579 | TeSys LRF – electronic thermal overload relay – 300…500 A – class 20
Schneider LR9F7579 | TeSys LRF – Electronic Thermal Overload Relay, 300–500 A, Class 20
The Schneider LR9F7579 is a robust, precision-engineered electronic thermal overload relay from the TeSys LRF series, built for demanding motor protection applications. With a current range of 300–500 A and Class 20 tripping characteristics, this relay is ideal for motors with long acceleration times or high inertia loads.
General Overview:
Brand: Schneider Electric
Series: TeSys LRF
Model: LR9F7579
Type: Electronic Thermal Overload Relay
Current Range: 300 to 500 A
Trip Class: Class 20 (for high-inertia or long-start motors)
Key Features:
Wide Adjustable Range: 300–500 A, suitable for large motors
Class 20 Tripping: Allows extended startup duration without nuisance tripping
Electronic Precision: Offers superior accuracy over traditional thermal relays
Phase Failure Protection: Detects and reacts to phase imbalance or loss
Manual/Automatic Reset: User-selectable reset options for flexibility
Trip Indicator: Clear LED indication for quick diagnostics
Test Button: Ensures relay functionality during setup or routine checks
Auxiliary Contacts: 1 NO + 1 NC built-in for status feedback
Mounting: Direct mount on TeSys F series contactors for easy integration
Technical Specifications:
Adjustment Range: 300 A to 500 A
Trip Class: Class 20
Auxiliary Contacts: 1 normally open + 1 normally closed
Reset Mode: Manual or automatic
Mounting Type: Direct mount (compatible with LC1F contactors)
Operating Temperature: Typically -20°C to +60°C
Standards: IEC 60947-4-1, IEC 60947-1
Degree of Protection: IP20 (device body)
Typical Applications:
High inertia equipment (e.g., crushers, mixers, fans)
Conveyor systems with long start-up periods
Heavy industrial motors
HVAC and pumping systems
Material processing and transport
Advantages:
High Accuracy Protection: Reduces motor wear and failure
Ideal for Tough Loads: Class 20 delay accommodates slow-start motors
Versatile Integration: Works seamlessly with Schneider TeSys motor starters
Enhanced Diagnostics: Quick fault identification reduces downtime
Durable & Compact: Space-saving design with robust components
| Range | TeSys |
|---|---|
| Product name | TeSys LRF |
| Device short name | LR9F |
| Product or component type | Electronic thermal overload relay |
| Relay application | Motor protection |
| Product compatibility | LC1F225…LC1F500 |
| Network type | AC |
| Thermal overload class | Class 20 conforming to IEC 60947-4 |
| Thermal protection adjustment range | 300…500 A |
| Signalling function | Pre-alarm indicator |
| Network frequency | 50/60 Hz |
|---|---|
| Mounting support | Direct on contactor Plate |
| Tripping threshold | 1.12 +/- 0.06 In tripping conforming to IEC 60947-4-1 |
| Surge withstand | 4 kV conforming to IEC 61000-4-5 |
| Contacts type and composition | 1 NO + 1 NC |
| [Ith] conventional free air thermal current | 5 A for control circuit |
| [Ue] rated operational voltage | 1000 V AC 50/60 Hz for power circuit conforming to VDE 0110 group C |
| [Ui] rated insulation voltage | Power circuit: 1000 V AC conforming to IEC 60947-4 |
| [Uimp] rated impulse withstand voltage | 8 kV conforming to IEC 60947-1 |
| Phase failure sensitivity | Tripping in 4 s +/- 20 % conforming to IEC 60947-4-1 |
| Reset | Manual reset |
| Control type | Dial white full-load current adjustment Test button red Push-button red reset Push-button stop |
| local signalling | Trip indicator |
| Temperature compensation | -20…70 °C |
| Current consumption | <= 5 mA no-load |
| switching capacity for alarm | 0…150 mA |
| Maximum voltage drop | <2.5 V closed state |
| Connections – terminals | Control circuit: screw clamp terminals 1 cable 0.75…2.5 mm² – cable stiffness: flexible – with cable end Control circuit: screw clamp terminals 1 cable 0.75…2.5 mm² – cable stiffness: solid Control circuit: screw clamp terminals 1 cable 0.75…4 mm² – cable stiffness: flexible – without cable end Control circuit: screw clamp terminals 2 cable 1…1.5 mm² – cable stiffness: flexible – with cable end Control circuit: screw clamp terminals 2 cable 1…2.5 mm² – cable stiffness: flexible – without cable end Control circuit: screw clamp terminals 2 cable 1 mm² – cable stiffness: solid Power circuit: lugs-ring terminals M10 |
| Tightening torque | Control circuit: 1.2 N.m on screw clamp terminals Power circuit: 35 N.m on screw clamp terminals |
| height | 136.8 mm |
| Width | 150 mm |
| Depth | 127.6 mm |
| Net weight | 2.32 kg |
| Standards | VDE 0660 IEC 60255-8 IEC 60947-4-1 IEC 60255-17 EN 60947-4-1 |
|---|---|
| product certifications | UL CSA UKCA |
| Protective treatment | TH |
| IP degree of protection | IP20 conforming to IEC 60529 |
| Ambient air temperature for operation | -20…55 °C conforming to IEC 60255-8 |
| Ambient air temperature for storage | -40…85 °C |
| Operating altitude | <= 2000 m without derating |
| Fire resistance | 850 °C conforming to IEC 60695-2-1 |
| Mechanical robustness | Shocks: 13 Gn for 11 ms conforming to IEC 60068-2-7 Vibrations 5…300 Hz: 2 GN conforming to IEC 60068-2-6 |
| Dielectric strength | 6 kV 50 Hz conforming to IEC 255-5 |
| Electromagnetic compatibility | Resistance to electrostatic discharge: 6 kV in indirect mode conforming to IEC 61000-4-2 Resistance to electrostatic discharge: 8 kV in air conforming to IEC 61000-4-2 Radiated radio-frequency electromagnetic field immunity test: 10 V/m conforming to IEC 61000-4-3 Fast transients immunity test: 2 kV conforming to IEC 61000-4-4 |
| Unit Type of Package 1 | PCE |
|---|---|
| Number of Units in Package 1 | 1 |
| Package 1 Height | 17.0 cm |
| Package 1 Width | 17.5 cm |
| Package 1 Length | 18.0 cm |
| Package 1 Weight | 1.979 kg |
| Unit Type of Package 2 | S04 |
| Number of Units in Package 2 | 6 |
| Package 2 Height | 30.0 cm |
| Package 2 Width | 40.0 cm |
| Package 2 Length | 60.0 cm |
| Package 2 Weight | 12.635 kg |
| Warranty | 18 months |
|---|
Main Document
Data Sheet : LR9F7579
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