Schneider Electric LR2K Thermal Overload Relay, 0.54-0.8 A, 1NO + 1NC

The Schneider Electric LR2K thermal overload relay is a precision-engineered component designed to provide reliable protection for three-phase motors against overloads and phase failures. With an adjustable thermal setting range of 0.54 to 0.8 A, this device is specifically calibrated for motors requiring precise current monitoring. It features a robust design that includes a manual-automatic reset selector, a test slide switch for simulation, and a clear flag indicator for status monitoring, ensuring that industrial electrical systems remain safe and operational.

Advantages

This thermal overload relay offers superior protection through its differential design, which effectively detects phase failure and load unbalance. The inclusion of 1NO and 1NC auxiliary contacts allows for seamless integration into control circuits for fault signaling. Users benefit from a high level of security, as the thermal adjustment dial is protected by a transparent, sealable cover. The device is built to international standards, ensuring compatibility and reliability in diverse industrial environments, while its compact construction allows for efficient installation.

Suitable for

• Protection of three-phase motors rated at 0.18 kW at 400 V
• Industrial motor control circuits requiring overload and phase failure detection
• Applications where manual or automatic reset functionality is needed
• Systems requiring fault signaling via auxiliary contacts

This relay may not be suitable for applications involving motors outside the 0.54 to 0.8 A current range. It is also not intended for use as a standalone circuit breaker for short-circuit protection, as it is specifically designed for thermal overload monitoring.

Key specifications

• Thermal setting range: 0.54 - 0.8 A
• Tripping class: 10A
• Auxiliary contacts: 1NO + 1NC
• Rated voltage: 250 V (contacts), up to 690 V (power circuit)
• Connection type: Screw clamp terminals
• Mounting options: Direct connection to contactors or DIN rail with terminal block

To use the relay, connect it directly to the bottom terminals of compatible three-pole contactors or mount it on a DIN rail using the appropriate terminal block. Once installed, adjust the thermal setting dial to the specific full-load current of the motor. The device can be tested using the integrated slide switch to simulate a trip, and the reset mode can be toggled between manual and automatic based on the specific requirements of the application.

What to consider before purchase

• Verify that the motor full-load current falls within the 0.54 - 0.8 A range
• Ensure compatibility with your existing contactor series
• Check if a separate terminal block is required for DIN rail mounting
• Confirm that the auxiliary contact configuration meets your control system needs

Usage recommendations: Regularly test the relay using the integrated test switch to ensure the protection mechanism is functioning correctly. Keep the transparent cover sealed to prevent unauthorized adjustments to the thermal settings.