SWAN Electric LR2-93 (LR2-D33 Base) Thermal Overload Relays.

• The SWAN Electric LR2-93 series thermal overload relays, based on the robust LR2-D33 design, are critical protective devices engineered to safeguard electric motors in higher current applications from damage due to overloads and phase failures.
• These relays employ a reliable thermal tripping mechanism that accurately senses motor current, disconnecting the motor circuit during sustained overcurrent conditions.
• Designed for direct mounting onto compatible SWAN CJX2 series contactors, they form a compact and dependable motor starter solution.
• This specific LR2-93 range offers various adjustable current settings to precisely protect motors with full-load currents typically ranging from 23A up to 93A.

Features

• High-Current Motor Protection: Provides dependable protection against motor overloads and offers sensitivity to phase loss conditions for larger motors.
• Precision Current Adjustment: Features a clear dial for accurate setting of the tripping current to match the motor's full-load current (FLC).
• Ambient Temperature Compensation: Ensures consistent and reliable tripping characteristics across a range of operating temperatures.
• Selectable Reset Mode: Typically includes options for manual or automatic reset after a trip, allowing flexibility for different application requirements (verify specific model).
• Integrated Test Facility: Equipped with a test button to allow for verification of the trip mechanism's functionality.
• Manual Stop Capability: Includes a stop button for manual interruption of the motor circuit.
• Standard Auxiliary Contacts: Comes with built-in 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for trip signaling and control circuit interlocking.
• Direct Contactor Integration: Designed for seamless direct mounting onto compatible larger SWAN CJX2 series AC contactors, optimizing panel space and simplifying installation.
• Visual Trip Status: Often features a trip indicator to clearly display a fault condition.

Benefits

• Prevents Costly Motor Damage: Effectively protects high-current motors from thermal damage due to overloads, extending their service life.
• Reduces Operational Disruptions: Minimizes unexpected motor failures and associated costly production downtime.
• Accurate and Tailored Protection: Adjustable current settings allow for precise protection matched to individual motor specifications, optimizing performance and preventing nuisance trips.
• Enhanced System Safety: Auxiliary contacts enable fault annunciation and the implementation of safety interlocks within the control system.
• Streamlined Motor Starter Assembly: Forms a compact, integrated, and efficient motor starting and protection unit when combined with a suitable CJX2 contactor.
• Reliable in Diverse Environments: Temperature compensation ensures consistent protection performance under varying ambient conditions.

In-Depth Technical Specifications

A. General Specifications for LR2-93 (LR2-D33 Base) Series:

B. Model-Specific Current Ratings and Compatibility:

Note: Contactor compatibility is typical. Always verify physical fitment and ensure the contactor's current rating is appropriate for the motor and overload relay combination. Consult specific product documentation for precise pairing.

Ideal Use

• Protecting larger three-phase AC motors (FLC 23A to 93A) in heavy-duty industrial applications like large pumps, industrial fans, crushers, mixers, and compressors.
• Direct-on-line (DOL) starting of higher-power motors when combined with a suitably rated CJX2 contactor.
• Installations demanding reliable thermal overload and phase imbalance/failure protection for critical motor assets.
• Heavy industrial control panels in sectors like mining, manufacturing, water treatment, and processing plants.

Tips

• Critical Sizing: For higher current motors, it's especially important to select the LR2-93 relay model whose adjustable current range accurately covers the motor's nameplate Full Load Current (FLC). Set the relay precisely to the motor's FLC.
• Contactor Coordination: Ensure the LR2-93 relay is correctly paired with a SWAN CJX2 contactor that can handle the motor's starting and running currents.
• Accurate Current Setting: Double-check the current setting on the relay dial against the motor's FLC for optimal and safe protection.
• Robust Wiring: Use appropriately sized conductors for the main power circuit, ensuring all connections are secure and torqued correctly to handle higher currents. The auxiliary NC contact (typically 95-96) is usually wired in series with the contactor coil.
• Reset Mode Selection: Choose the reset mode (manual or auto) according to the application's safety standards and operational procedures. Manual reset is often preferred for attended machinery.
• Routine Functional Checks: Periodically use the TEST button to confirm the operational integrity of the trip mechanism and the control circuit response.
• Suitable Environment: Install in an environment within the relay's specified operating temperature range and protect it from excessive vibration, dust, and moisture.