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Specification & Description
| Specification | Description |
|---|---|
| Part Number | LRD350 |
| Manufacturer | Schneider |
| Product Range | TeSys |
| Product or Component Type | Differential thermal overload relay |
| Device Short Name | LRD |
| Relay Application | Motor protection |
| Product Compatibility | LC1D65A, LC1D50A, LC1D40A |
| Network Type | AC, DC |
| Thermal Overload Class | Class 10A conforming to IEC 60947-4-1 |
| Thermal Protection Adjustment Range | 37 to 50 A |
| Rated Insulation Voltage (Ui) | Power circuit: 690 V AC |
| Network Frequency | 0 to 400 Hz |
| Mounting Support | Plate with specific accessories, Rail with specific accessories, Under contactor |
| Tripping Threshold | 1.14 +/- 0.06 Ir conforming to IEC 60947-4-1 |
| Auxiliary Contact Composition | 1 NO + 1 NC |
| Conventional Free Air Thermal Current (Ith) | 5 A for signalling circuit |
| Permissible Current | 0.95 A at 380 V AC-15 for signalling circuit, 0.06 A at 440 V DC-13 for signalling circuit |
| Rated Operational Voltage (Ue) | 690 V AC 0 to 400 Hz for power circuit |
| Associated Fuse Rating | 4 A gG for signalling circuit, 4 A BS for signalling circuit |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Phase Failure Sensitivity | Tripping current 130 % of Ir on two phase, the last one at 0 |
| Control Type | Red push-button: stop, Blue push-button: reset |
| Temperature Compensation | -20 to 60 °C |
| Connections - Terminals | Control circuit: screw clamp terminals, Power circuit: EverLink BTR screw connectors |
| Tightening Torque | Control circuit: 1.7 N.m, Power circuit: 5 N.m |
| Height | 70 mm |
| Width | 55 mm |
| Depth | 123 mm |
| Net Weight | 0.375 kg |
The Schneider LRD350 is a high-quality thermal overload relay designed to offer efficient and reliable protection for electric motors. This component is part of the TeSys Deca range and is compatible with a variety of contactors, including the LC1D65A, LC1D50A, and LC1D40A. It is engineered to safeguard motors by detecting and responding to overcurrent situations that could potentially cause damage.
With an adjustable thermal protection range of 37 to 50 A, the LRD350 ensures precise protection tailored to the specific needs of your motor. It operates with a class 10A tripping characteristic, conforming to IEC 60947-4-1 standards, which means it can trip in 10 seconds or less if the current reaches 7 times the set value, providing quick response to prevent motor overheating.
The device is suitable for use in both AC and DC networks and can handle a rated insulation voltage of up to 690 V, making it versatile for various industrial applications. The LRD350 features a tripping threshold of 1.14 +/- 0.06 Ir in accordance with IEC 60947-4-1, ensuring accurate and consistent performance.
For ease of installation, the LRD350 comes with EverLink BTR screw connectors, which are designed for robust and secure wire connections. The control circuit terminals are screw clamp type, accommodating cables from 1 to 2.5 mm². The unit's compact dimensions, with a height of 70 mm, width of 55 mm, and depth of 123 mm, allow for efficient use of space inside control panels.
The LRD350 is built to withstand challenging industrial environments, with an IP20 degree of protection conforming to IEC 60529 and a temperature compensation range from -20 to 60 °C, ensuring reliable operation under varying climatic conditions. It also meets rigorous standards for mechanical robustness, with shock resistance of 15 Gn for 11 ms and vibration resistance of 4 gn, as per IEC 60068-2-6 and IEC 60068-2-7.
This thermal overload relay is a Green Premium product, indicating that it meets high environmental standards and is free of harmful substances, aligning with global initiatives for sustainability and environmental responsibility. It is also compliant with the EU RoHS Directive, ensuring that it is free of toxic heavy metals and mercury.
The Schneider LRD350 is a dependable and environmentally conscious choice for motor protection in a wide range of industrial applications, offering both performance and peace of mind.
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Frequently Asked Questions
What is the thermal overload class of this overload relay?
The overload relay is classified as Class 10A, conforming to IEC 60947-4-1, which means it is designed to trip within 10 seconds at 600% of the full load current.
Can this overload relay be used with different types of power circuits?
Yes, it is suitable for use with both DC and AC power circuits, enhancing its versatility in various motor protection applications.
What is the thermal protection adjustment range for this relay?
The thermal protection adjustment range for this relay is between 37 to 50 A, allowing for precise protection settings based on the motor's current requirements.
What are the mounting support options for this relay?
The relay can be mounted on a plate with specific accessories, on a rail with specific accessories, or directly under a contactor, providing flexibility in installation.
What type of connections does this overload relay support?
It supports screw clamp terminals for the control circuit and EverLink BTR screw connectors for the power circuit, ensuring secure and reliable connections.
What is the IP degree of protection for this overload relay?
The overload relay has an IP20 degree of protection, conforming to IEC 60529, which provides a basic level of protection against solid objects.
What is the ambient air temperature range for the operation of this relay?
The relay can operate within an ambient air temperature range of -20 to 60°C without derating, making it suitable for a wide range of environmental conditions.
Does this overload relay have any certifications?
Yes, it has several product certifications including IEC, UL, CSA, CCC, EAC, DNV-GL, RMRS, EU-RO MR, LROS, ATEX INERIS, and UKCA, indicating compliance with international standards.
What is the significance of the 'Green Premium' status for this relay?
The 'Green Premium' status indicates that the relay meets Schneider Electric's environmental standards, ensuring that it is free from certain hazardous substances and is compliant with key environmental regulations.
Is there any specific information available regarding the end of life for this relay?
Yes, the relay comes with an End Of Life Information profile, which provides details on how to responsibly dispose of the product at the end of its service life.
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