Schneider Electric LR9F79
MPNLR9F79
Obsolete
TeSys LRF - electronic thermal overload relay - 300...500 A - class 10/20
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
How we verify every order →Specifications
| Parameter | Value |
|---|---|
| Control type | Dial White full-load current adjustment Test button Red Push-button reset Push-button Red stop Selector switch load balancing Selector switch class 10/20 |
| Network type | AC |
| Product or component type | Electronic thermal overload relay |
| Contacts type and composition | 1 NO + 1 NC |
| Surge withstand | 4 kV IEC 61000-4-5 |
| Maximum voltage drop | <2.5 V closed state |
| Supply voltage limits | 17...32 V alarm circuit) |
| Supply voltage | 24 V DC alarm circuit |
| Voltage | Power circuit 1000 V AC IEC 60947-4 |
| [Ue] rated operational voltage | 1000 V AC 50/60 Hz power circuit VDE 0110 group C |
| [Uimp] rated impulse withstand voltage | 8 kV IEC 60947-1 |
| Current consumption | <= 5 mA no-load |
All specifications
| Parameter | Value |
|---|---|
| [Ith] conventional free air thermal current | 5 A control circuit |
| Network frequency | 50/60 Hz |
| Phase failure sensitivity | Tripping in 4 s +/- 20 % IEC 60947-4-1 |
| IP degree of protection | IP20 conforming to IEC 60529 |
| Mounting support | Direct on contactor Plate |
| Connections - terminals | Control circuit screw clamp terminals 1 0.001...0.004 in² (0.75...2.5 mm²) flexible - with cable end Control circuit screw clamp terminals 1 0.001...0.004 in² (0.75...2.5 mm²) solid Control circuit screw clamp terminals 1 0.001...0.006 in² (0.75...4 mm²) flexible - without cable end Control circuit screw clamp terminals 2 0.002...0.002 in² (1...1.5 mm²) flexible - with cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible - without cable end Control circuit screw clamp terminals 2 0.002 in² (1 mm²) solid Power circuit lugs-ring terminals M10 Alarm circuit screw clamp terminals 1 0.0008...0.002 in² (0.5...1.5 mm²) flexible - without cable end |
| Operating altitude | <= 6561.68 ft (2000 m) without derating |
| Depth | 5.02 in (127.6 mm) |
| Width | 5.9 in (150 mm) |
| Height | 5.4 in (136.8 mm) |
| Standards | VDE 0660 EN 60947-4-1 IEC 60947-4-1 IEC 60255-17 IEC 60255-8 |
| Range | TeSys |
| Reset | Manual reset |
| Category | 22334-CONTACTOR,F-LINE,OVERLOADS |
| Fire resistance | 1562 °F (850 °C) IEC 60695-2-1 |
| Local signalling | Alarm Trip indicator |
| Device short name | LR9F |
| Relay application | Motor protection |
| Tightening torque | Control circuit 1.2 N.m screw clamp terminals Power circuit 35 N.m screw clamp terminals Alarm circuit 0.45 N.m screw clamp terminals |
| Tripping threshold | 1.05 +/- 0.06 In alarm IEC 60947-4-1 1.12 +/- 0.06 In tripping IEC 60947-4-1 |
| Dielectric strength | 6 kV 50 Hz IEC 255-5 |
| Signalling function | Pre-alarm indicator |
| Protective treatment | TH |
| Mechanical robustness | Shocks13 Gn for 11 ms IEC 60068-2-7 Vibrations 5...300 Hz2 GN IEC 60068-2-6 |
| Thermal overload class | Class 10/20 IEC 60947-4 |
| Temperature compensation | -4...158 °F (-20...70 °C) |
| Switching capacity for alarm | 0...150 mA |
| Electromagnetic compatibility | Resistance to electrostatic discharge 6 kV in indirect mode IEC 61000-4-2 Resistance to electrostatic discharge 8 kV in air IEC 61000-4-2 Radiated radio-frequency electromagnetic field immunity test 10 V/m IEC 61000-4-3 Fast transients immunity test 2 kV IEC 61000-4-4 |
| Ambient air temperature for storage | -40...185 °F (-40...85 °C) |
| Thermal protection adjustment range | 300...500 A |
| Ambient air temperature for operation | -4...131 °F (-20...55 °C) IEC 60255-8 |
MPN
LR9F79