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Product Description: Schneider Electric LT3SA00ED

The Schneider Electric LT3SA00ED is a thermistor-based motor protection relay designed to monitor the temperature of motors using PTC thermistors. It is used to detect overheating conditions and provide protection against thermal damage by triggering an alarm or disconnecting the motor. The relay operates with a 24 V DC control voltage and is DIN rail mountable, offering easy integration into industrial motor control panels.

Key Features

• Thermistor-based motor protection relay
• Supply voltage: 24 V DC
• Monitors up to 6 PTC thermistors connected in series
• Adjustable reset mode: manual or automatic
• LED indicators for status and fault display
• Relay output: 1 changeover contact (SPDT)
• DIN rail mounting
• Designed for use with motors equipped with embedded PTC sensors

Technical Specifications

• Control voltage range: 20.4 to 26.4 V DC
• Power consumption: ≤ 1 W
• Triggering resistance threshold: 2.7 kΩ
• Reset resistance threshold: 1.5 kΩ
• Relay output contact rating: 5 A at 250 V AC
• Response time: ≤ 1 second
• Insulation voltage: 250 V
• Operating temperature: -10°C to +55°C
• Storage temperature: -40°C to +85°C
• Mounting type: 35 mm DIN rail (EN 50022)
• Dimensions (W x H x D): 45 mm x 78 mm x 79 mm
• Weight: Approximately 0.2 kg

Application Areas

• Motor protection systems
• HVAC systems
• Pumps, compressors, and fans
• Industrial automation panels
• Applications where thermal monitoring is critical

Advantages

• Prevents motor overheating by monitoring internal temperature
• Quick detection and reaction to thermal faults
• Simple integration with standard PTC thermistors
• LED indication for rapid fault identification
• Compact design for space- saving panel installations