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Schneider LR9F5371 | TeSys LRF – electronic thermal overload relay – 132…220 A – class 10

Schneider Electric

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15,719 EGP 28,580 EGP

In stock


Schneider LR9F5371 | TeSys LRF – electronic thermal overload relay – 132…220 A – class 10

Schneider LR9F5371 Description

Schneider LR9F5371 Description


In the world of electrical engineering, protecting motors is paramount to ensuring the longevity and efficiency of machinery. Schneider Electric, a leader in this field, offers a range of high-quality products designed to safeguard motors from damage. One such product is the Schneider LR9F5371, a thermal overload relay that stands out for its robust features and reliability. But what exactly makes this device special? Let’s dive into the details.

What is the Schneider LR9F5371?

The Schneider LR9F5371 is a thermal overload relay designed to protect motors from overheating and excessive current. This device is crucial in preventing motor damage by interrupting the circuit when an overload is detected. It is specifically tailored to safeguard motors in various applications, ensuring they operate within safe parameters.

Key Features of the Schneider LR9F5371

Thermal Overload Protection

The primary function of the Schneider LR9F5371 is to provide thermal overload protection. This feature ensures that the motor is automatically disconnected from the power supply if it overheats, thereby preventing potential damage or failure.

Adjustable Trip Settings

Another significant feature is its adjustable trip settings. This allows users to set the relay according to the specific requirements of their motor, providing a tailored protection solution that enhances both safety and performance.

Compact Design

The Schneider LR9F5371 boasts a compact design, making it easy to install in various setups without requiring excessive space. This makes it an ideal choice for both new installations and retrofits.

Technical Specifications

Voltage Ratings

The Schneider LR9F5371 is designed to operate at different voltage levels, making it versatile for various applications. It is compatible with standard industrial voltages, ensuring broad usability.

Current Ratings

With adjustable current settings, the LR9F5371 can be set to match the current rating of the motor it protects. This flexibility ensures optimal protection and performance.

Dimensions and Weight

The device’s compact dimensions and lightweight design make it easy to handle and install, even in confined spaces. This practical design feature is beneficial for technicians and engineers alike.

How the Schneider LR9F5371 Works

Principle of Operation

The Schneider LR9F5371 operates on the principle of thermal overload protection. It uses a bimetallic strip that bends when heated by the current flowing through the motor. If the current exceeds the preset limit, the strip bends enough to trigger the relay and disconnect the motor from the power supply.

Installation Process

Installing the Schneider LR9F5371 is straightforward. It involves connecting the relay in series with the motor circuit. Detailed instructions provided by Schneider Electric ensure that the installation is done correctly, maximizing the device’s effectiveness.

Benefits of Using Schneider LR9F5371

Enhanced Motor Lifespan

By protecting motors from overheating and overloads, the Schneider LR9F5371 significantly extends their lifespan. This reduces the need for frequent replacements and repairs, leading to cost savings over time.

Energy Efficiency

Efficient motor operation is crucial for energy savings. The LR9F5371 ensures that motors run within their optimal parameters, reducing energy wastage and lowering operational costs.

Reduced Downtime

Unplanned downtime can be costly. The Schneider LR9F5371 helps minimize such occurrences by providing reliable protection, ensuring that motors operate smoothly without unexpected interruptions.

Applications of the Schneider LR9F5371

Industrial Uses

In industrial settings, where motors are subject to heavy-duty operations, the Schneider LR9F5371 provides essential protection, ensuring continuous and efficient operation of machinery.

Commercial Applications

Commercial environments also benefit from the LR9F5371’s protection capabilities. It ensures that HVAC systems, elevators, and other motor-driven equipment operate safely and efficiently.

Compatibility with Different Motor Types

The versatility of the LR9F5371 allows it to be used with various motor types, including single-phase and three-phase motors. This broad compatibility makes it a versatile tool in many applications.

Comparing Schneider LR9F5371 with Other Motor Protection Devices

Comparison with Competitors

When compared to other motor protection devices, the Schneider LR9F5371 stands out for its reliability and range of features. Many competitors offer similar products, but the LR9F5371’s adjustable settings and compact design give it an edge.

Unique Selling Points

Its unique selling points include robust thermal protection, ease of installation, and flexible settings. These features make it a preferred choice for many industries.

Installation Guide

Pre-installation Checklist

Before installing the Schneider LR9F5371, ensure that you have all the necessary tools and that the motor and power supply are properly isolated.

Step-by-Step Installation Process

  1. Disconnect Power: Ensure the power supply to the motor is turned off.
  2. Mount the Relay: Securely mount the LR9F5371 in the designated location.
  3. Connect Wires: Follow the wiring diagram provided to connect the relay in series with the motor.
  4. Set Trip Settings: Adjust the trip settings according to the motor’s specifications.
  5. Test the Installation: Once installed, test the setup to ensure proper operation.

Safety Precautions

Always adhere to safety guidelines, including wearing protective gear and verifying that all connections are secure before powering up the motor.

Maintenance Tips for Schneider LR9F5371

Regular Inspection Routines

Regular inspections are crucial to ensure the relay is functioning correctly. Look for signs of wear or damage and address any issues promptly.

Common Issues and Troubleshooting

Common issues include incorrect trip settings or loose connections. Refer to the troubleshooting guide provided by Schneider Electric to resolve these problems efficiently.

Customer Reviews and Feedback

Positive Experiences

Many customers praise the Schneider LR9F5371 for its reliability and ease of use. Positive feedback highlights its effectiveness in protecting motors and reducing downtime.

Areas for Improvement

Some users suggest enhancements in the user manual for clearer instructions. However, overall satisfaction remains high.

Where to Buy Schneider LR9F5371

Authorized Dealers

Purchase the Schneider LR9F5371 from authorized dealers to ensure authenticity and warranty coverage. Schneider Electric’s website provides a list of authorized sellers.

Online Platforms

Online platforms like Amazon and specialized industrial supply websites also offer the LR9F5371. Ensure the seller is reputable to avoid counterfeit products.

Pricing and Warranty Information

Cost Range

The price of the Schneider LR9F5371 varies depending on the supplier and any additional features. Generally, it falls within a competitive range for motor protection devices.

Warranty Details

Schneider Electric offers a warranty on the LR9F5371, typically covering defects in materials and workmanship. Refer to the product documentation for specific warranty terms.

SKU: LR9F5371 Category:
Range TeSys
Product name TeSys LRF
Device short name LR9F
Product or component type Electronic thermal overload relay
Relay application Motor protection
Product compatibility LC1F185…LC1F265
Network type AC
Thermal overload class Class 10 conforming to IEC 60947-4
Thermal protection adjustment range 132…220 A
Network frequency 50/60 Hz
Mounting support Direct on contactor
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 on front relay
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 101 mm
Width 115 mm
Depth 123.5 mm
Net weight 0.95 kg
Standards IEC 60255-17
IEC 60947-4-1
IEC 60255-8
VDE 0660
EN 60947-4-1
product certifications UL
Protective treatment TH
IP degree of protection IP20 conforming to IEC 60529
IP20 conforming to VDE 0106
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
Packing Units
Unit Type of Package 1 PCE
Number of Units in Package 1 1
Package 1 Height 15.000 cm
Package 1 Width 16.500 cm
Package 1 Length 13.000 cm
Package 1 Weight 1.035 kg
Unit Type of Package 2 S04
Number of Units in Package 2 11
Package 2 Height 30 cm
Package 2 Width 40 cm
Package 2 Length 60 cm
Package 2 Weight 12.030 kg
Unit Type of Package 3 P06
Number of Units in Package 3 44
Package 3 Height 75.000 cm
Package 3 Width 60.000 cm
Package 3 Length 80.000 cm
Package 3 Weight 59.048 kg
Contractual warranty
Warranty 18 months

Main Document

Data Sheet : LR9F5371

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