Schneider Electric - LT3SA00ED - TeSys LT3 Thermistor Protection Unit
The Schneider Electric LT3SA00ED is a TeSys LT3 thermistor protection unit designed to monitor motor temperatures through PTC (Positive Temperature Coefficient) probes, providing essential protection against overheating. This unit features an automatic reset function and is compatible with dual voltage supplies of 24 V DC or 48 V DC. It includes one normally open (1 NO) and one normally closed (1 NC) contact, allowing for versatile integration into control circuits. A fault indicator is present on the front panel for easy status monitoring. Please note that this product was discontinued on October 9, 2023. The recommended replacement is the RM35TM50MW motor voltage and temperature control relay.
Technical Specifications:
• Control Circuit Voltage: 24 V DC or 48 V DC
• Reset Function: Automatic
• Contact Configuration: 1 NO + 1 NC
• Conventional Free Air Thermal Current (Ith): 5 A
• Rated Insulation Voltage (Ui): 250 V AC, 50/60 Hz
• Resistance Thresholds:
• Reset: 1500…1650 Ω
• Tripping: 2700…3100 Ω
• Number of Probes Supported: Up to 6
• Short Circuit Detection Resistance: < 20 Ω
• Connections - Terminals: Cage type connectors supporting various cable sizes
• Tightening Torque: 0.8 N·m
• Dimensions (H x W x D): 100 mm x 22.5 mm x 100 mm
• Product Weight: 0.22 kg
• Standards Compliance: IEC 60034-11, VDE 0660
• Certifications: LROS (Lloyd’s Register of Shipping)
• IP Degree of Protection: IP20
• Operating Ambient Temperature Range: -25°C to +60°C
• Storage Temperature Range: -40°C to +85°C
• Operating Altitude: Up to 1500 m without derating; above 1500 m up to 3000 m with derating
• Vibration Resistance: 1 gn (25…150 Hz) and 2.5 gn (2…25 Hz)
• Shock Resistance: 5 gn for 11 ms
• Electromagnetic Compatibility:
• Immunity to microbreaks and voltage drops
• Resistance to electrostatic discharge (Level 3)
• Resistance to fast transients (Level 3)
• Surge resistance (Level 4)
• Susceptibility to electromagnetic fields (Level 3)