SWAN Electric LR2-36 (LR2-D23 Base) Thermal Overload Relays.

• The SWAN Electric LR2-36 series thermal overload relays, built on the LR2-D23 base design, are essential protective components designed to safeguard electric motors against overloads and phase failure conditions.
• These relays utilize a thermal tripping mechanism to accurately monitor motor current and disconnect the motor circuit during sustained overcurrents, thereby preventing damage.
• Engineered for direct mounting onto compatible SWAN CJX2 series contactors, they form an integrated and compact motor starter solution.
• The models THR-LR2-36-D2353 and THR-LR2-36-D2355 cater to motors with full-load currents typically in the 23A to 36A range.

Features

• Robust Motor Protection: Provides reliable protection against motor overloads and offers sensitivity to phase failures.
• Adjustable Current Setting: Features a clearly marked dial for precise adjustment of the tripping current to match the specific motor's full-load current (FLC).
• Temperature Compensation: Ensures consistent and accurate tripping performance across varying ambient temperatures.
• Manual/Auto Reset: Typically includes a selectable manual or automatic reset mechanism after a trip condition (verify for the specific model).
• Integrated Test Function: Equipped with a test button to verify the functionality of the tripping mechanism.
• Manual Stop Button: Allows for manual stopping of the motor circuit via the relay.
• Built-in Auxiliary Contacts: Comes standard with 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for trip signaling or control circuit interlocking.
• Direct Contactor Mounting: Designed for seamless, direct attachment to compatible SWAN CJX2 series AC contactors, optimizing panel space and simplifying wiring.
• Visual Trip Indication: Often includes a visual indicator to clearly show when the relay has tripped.

Benefits

• Extended Motor Life: Safeguards motors from thermal damage due to overloads, significantly increasing their operational lifespan.
• Minimized Operational Downtime: Helps prevent unexpected motor failures, leading to more continuous and reliable plant operations.
• Tailored Motor Protection: The adjustable current setting allows for precise protection matched to individual motor characteristics, preventing nuisance tripping or under-protection.
• Improved System Safety: Auxiliary contacts can be used to alert operators to a trip or to implement safety interlocks in the control system.
• Space-Efficient Motor Starting: Forms a compact and efficient motor starter solution when combined with a CJX2 contactor.
• Dependable Performance: Temperature compensation ensures reliable protection in diverse industrial environments.

In-Depth Technical Specifications

A. General Specifications for LR2-36 (LR2-D23 Base) Series:

B. Model-Specific Current Ratings and Compatibility:

Note: Contactor compatibility is typical. The LR2-36 (D23 base) is generally for contactors like CJX2-25, CJX2-32, and potentially up to CJX2-40. Always confirm physical fitment and current range suitability with specific product documentation.

Ideal Use

• Protection of three-phase AC motors in industrial equipment such as pumps, fans, conveyors, compressors, and machine tools with FLCs between 23A and 36A.
• Direct-on-line (DOL) motor starting applications when paired with a compatible CJX2 contactor.
• Systems requiring dependable thermal overload and phase unbalance/failure protection.
• Industrial control panels in manufacturing facilities, HVAC systems, and material handling applications.

Tips

• Accurate Sizing: Select the LR2-36 relay model where the motor's nameplate Full Load Current (FLC) falls comfortably within the adjustable current range. Set the relay to the motor's FLC for optimal protection.
• Contactor Compatibility: Ensure the LR2-36 relay is compatible with the specific SWAN CJX2 contactor it will be mounted on, both physically and in terms of current capacity.
• Precise Current Setting: Carefully adjust the current setting dial on the relay to match the motor's FLC.
• Secure Wiring: Ensure all main power and auxiliary control circuit connections are properly terminated and tightened. The auxiliary NC contact (usually 95-96) is typically wired in series with the contactor coil.
• Reset Mode Consideration: Select the manual or automatic reset mode based on the application's safety protocols and operational needs. Manual reset is generally recommended for enhanced safety.
• Periodic Testing: Utilize the TEST button at regular intervals to confirm the proper functioning of the trip mechanism and associated control circuitry.
• Installation Environment: Install the relay in an environment that aligns with its operational temperature specifications and is free from excessive contaminants.