SWAN Electric LR2-25 (LR2-D13 Base) Thermal Overload Relays.

• The SWAN Electric LR2-25 series thermal overload relays, based on the LR2-D13 design, are crucial protective devices engineered to safeguard electric motors from damage caused by overloads and phase failures.
• These relays operate on a thermal principle, accurately sensing motor current and tripping to disconnect the motor when sustained overcurrent conditions occur.
• Designed for direct mounting onto SWAN CJX2 series contactors, they form a compact and reliable motor starter solution for a wide range of industrial applications.
• This specific range offers multiple adjustable current settings to precisely match various motor full-load currents up to 25A.

Features

• Overload Protection: Reliably protects AC motors against damaging overcurrents.
• Phase Failure Protection: Offers sensitivity to phase loss conditions, further protecting three-phase motors.
• Adjustable Current Setting: Features a dial for precise adjustment of the tripping current to match the motor's full-load current (FLC).
• Temperature Compensation: Ensures accurate tripping characteristics across a range of ambient temperatures.
• Manual/Auto Reset: Typically includes a selectable manual or automatic reset mode after a trip (verify specific model).
• Test Button: Allows for functional testing of the trip mechanism.
• Stop Button: Provides a means to manually stop the motor.
• Integrated Auxiliary Contacts: Includes built-in 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for signaling trip status or control circuit interlocking.
• Direct Mounting: Designed to directly connect to compatible SWAN CJX2 series AC contactors, simplifying installation and saving panel space.
• Clear Indication: Trip indicator often present to visually show a fault condition.

Benefits

• Motor Longevity: Prevents motor burnout and extends operational life by protecting against overloads and phase loss.
• Reduced Downtime: Minimizes unexpected motor failures and associated production interruptions.
• Precise Protection: Adjustable current settings allow for tailored protection closely matched to individual motor specifications.
• Enhanced Safety: Auxiliary contacts can be used to signal faults or interlock control circuits, improving overall system safety.
• Compact Motor Starter: When combined with a CJX2 contactor, creates an efficient and space-saving motor starting and protection solution.
• Reliable Operation: Temperature compensation ensures consistent protection regardless of ambient temperature variations.

In-Depth Technical Specifications

A. General Specifications for LR2-25 (LR2-D13 Base) Series:

B. Model-Specific Current Ratings and Compatibility:

Note: Contactor compatibility is typical; always verify with specific product documentation for the most accurate pairing, especially for borderline current ratings.

Ideal Use

• Protecting three-phase and single-phase AC motors in industrial machinery (pumps, fans, conveyors, compressors, machine tools).
• Direct-on-line (DOL) motor starter applications when combined with a CJX2 contactor.
• Applications requiring reliable thermal overload and phase failure protection.
• Control panels for manufacturing, HVAC systems, material handling, and general industrial automation.
• Suitable for motors where the full load current falls within the adjustable ranges of the specific LR2-25 models.

Tips

• Correct Sizing: Select the LR2-25 relay model whose adjustable current range comfortably encompasses the motor's nameplate Full Load Current (FLC). It's generally recommended to set the relay to the motor's FLC.
• Contactor Pairing: Ensure the chosen LR2-25 relay is physically and electrically compatible with the SWAN CJX2 contactor it will be mounted on. Refer to the table above for typical pairings.
• Proper Setting: Carefully adjust the current setting dial on the relay to match the motor's FLC for optimal protection.
• Wiring: Ensure all power and control circuit connections are tight and correctly wired according to the circuit diagram. The auxiliary NC contact (typically 95-96) is usually wired in series with the contactor coil for trip functionality.
• Reset Mode Selection: Choose the appropriate reset mode (manual or auto) based on the application's safety and operational requirements. Manual reset is often preferred for safety.
• Regular Testing: Periodically use the TEST button to verify the trip mechanism and control circuit functionality.
• Environmental Considerations: Install in an environment that is within the relay's operating temperature range and free from excessive dust, moisture, or corrosive substances.