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Specification & Description
| Specification | Description |
|---|---|
| Part Number | LR2D3559 |
| Manufacturer | Schneider |
| Product Type | Thermal Overload Relay |
| Application | Motor Protection |
| Compatibility | LC1D80, LC1D95 |
| Network Type | AC, DC |
| Thermal Overload Class | Class 20 conforming to IEC 60947-4-1 |
| Thermal Protection Adjustment Range | 48...65 A |
| Rated Insulation Voltage ([Ui]) | 690 V AC power circuit conforming to IEC 60947-4-1, 600 V AC power circuit conforming to UL |
| Network Frequency | 0...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 | 0.72 A at 500 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...400 Hz |
| 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...60 °C |
| Connections - Terminals | Screw clamp terminals for power and control circuits with various cable flexibility options |
| Tightening Torque | Control circuit: 1.7 N.m, Power circuit: 9 N.m |
| Dimensions (Height x Width x Depth) | 100 mm x 75 mm x 121 mm |
| Product Weight | 0.535 kg |
The Schneider LR2D3559 Thermal Overload Relay is a robust and reliable component designed to offer efficient motor protection. This three-pole device is engineered to safeguard motors from potential damage due to overloads by interrupting the electrical supply when excessive current is detected. It features a 1NO + 1NC contact composition and is suitable for use with a wide range of motor applications.
With a thermal protection adjustment range of 48 to 65 A, the LR2D3559 ensures precise protection for motors within this current range. It is compatible with AC and DC networks and can handle a rated insulation voltage of up to 690 V ac, making it versatile for various industrial settings.
The relay is equipped with a tripping threshold of 1.14 +/- 0.06 Ir in accordance with IEC 60947-4-1 standards, ensuring accurate and consistent performance. The device also includes a phase failure sensitivity feature, which triggers the relay if there is an imbalance in the current across the phases.
Mounting the LR2D3559 is straightforward, with options for plate, rail, or under-contactor installation, complemented by specific accessories for each method. The relay's control type includes a red push-button for stop and a blue push-button for reset, providing clear and intuitive manual control.
Constructed to withstand challenging environments, the LR2D3559 operates within an ambient air temperature range of -20 to 60 °C without derating, and it is rated IP20 for protection against solid objects larger than 12.5 mm. Its robust design is also evident in its vibration and shock resistance, ensuring durability and a long service life.
The Schneider LR2D3559 Thermal Overload Relay is a Green Premium product, reflecting Schneider Electric's commitment to sustainable development and compliance with environmental regulations. This component is an essential part of motor control solutions, offering both protection and peace of mind in a wide array of industrial applications.
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Frequently Asked Questions
What is the function of a thermal overload relay?
A thermal overload relay is designed to protect electric motors from overheating, caused by excessive current draw, prolonged motor stall, or a loss of phase. It works by measuring the heat generated by the current and tripping the circuit when the temperature exceeds a preset limit, thus preventing potential damage to the motor.
How do I adjust the thermal protection range on this relay?
The thermal protection range on the relay can be adjusted by turning the dial located on the front of the unit. This allows you to set the correct current range to match the motor's requirements, ensuring reliable protection against overload conditions.
Can this relay be used with both AC and DC power circuits?
Yes, the relay is compatible with both AC and DC power circuits, making it versatile for use in various applications and network types.
What does the 1NO + 1NC auxiliary contact composition mean?
The 1NO + 1NC auxiliary contact composition means that the relay includes one Normally Open (NO) and one Normally Closed (NC) contact. These contacts can be used for signaling and control purposes, such as indicating the status of the relay or controlling auxiliary circuits.
What is the significance of the class 20 designation for this relay?
The class 20 designation refers to the tripping characteristic of the thermal overload relay. It indicates that the relay will trip or activate within a time frame that is standard for class 20 relays when the current reaches 20% above the relay's rated current.
How does phase failure sensitivity work in this relay?
Phase failure sensitivity in the relay ensures protection against phase loss, which can be harmful to motors. If one of the phases fails or the current drops to a certain level, the relay will detect the imbalance and disconnect the motor to prevent damage.
What is the temperature compensation feature on this relay?
The temperature compensation feature allows the relay to maintain consistent protection performance over a specified temperature range. This means that the relay will not trip unnecessarily due to ambient temperature changes, ensuring reliable motor protection.
How do I know if the relay has tripped due to an overload?
The relay is equipped with a red stop push-button and a blue reset push-button. If the relay has tripped due to an overload, the red button will pop out, indicating that the relay has activated and the circuit is open. To reset the relay, simply press the blue button once the overload condition has been cleared.
What mounting supports are available for this relay?
The relay can be mounted using a plate with specific accessories, a rail with specific accessories, or directly under a contactor. This provides flexibility for installation in various types of control panels and motor starter configurations.
What should I consider when selecting a fuse for use with this relay?
When selecting a fuse to use with the relay, ensure that the fuse rating is compatible with the signalling circuit requirements. The relay's associated fuse rating is typically 4A gG for the signalling circuit, which should be taken into account when choosing the appropriate fuse.
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