Schneider Electric (Square D) LR2D3557 50A Thermal Overload Relay

Description

The Schneider Electric (Square D) LR2D3557 is a 50A thermal overload relay engineered to provide dependable, precise protection for three-phase and single-phase motors in commercial and industrial HVAC applications. Designed for use with TeSys D-series contactors, this relay offers automatic and manual reset options, making it a versatile solution for motor starter assemblies in mechanical rooms, rooftop units, air handling equipment, and other motor-driven HVAC systems.

Key Features

• 50A thermal overload relay for robust motor overcurrent protection
• Compatible with Schneider Electric TeSys D-series contactors for integrated motor starter assemblies
• Bimetallic thermal sensing element provides accurate trip response to overload conditions
• Manual and automatic reset modes for flexible field configuration
• Phase-loss sensitivity to protect motors from single-phasing conditions
• Trip indicator for quick visual fault identification
• Compact, DIN-rail-compatible design for panel and enclosure mounting
• Designed and manufactured by Schneider Electric (Square D), a globally trusted brand in electrical protection

Application

The LR2D3557 is ideal for protecting compressor motors, fan motors, pump motors, and other motor loads commonly found in commercial HVAC and refrigeration systems. Its thermal overload protection guards against sustained overcurrent conditions that can cause motor winding damage, extending equipment life and reducing costly downtime.

Why Choose Schneider Electric (Square D)?

Schneider Electric’s Square D product line is synonymous with quality, reliability, and innovation in electrical distribution and motor control. The LR2D3557 upholds that tradition, offering field-proven performance in demanding environments and full compatibility with the TeSys D contactor family for a complete, coordinated motor starter solution.