Schneider Electric LT3SM00ED TeSys Thermistor Relay

Description

The Schneider Electric LT3SM00ED is a thermistor protection unit from the TeSys range, designed for monitoring the temperature of motor windings via PTC probes. This model operates with a control circuit voltage of 24 to 48V DC and features a manual reset. It provides essential protection against overheating, ensuring the longevity and reliability of your machinery.

Specifications

• Manufacturer: Schneider Electric
• Model: LT3SM00ED
• Product Range: TeSys LT3
• Function: Thermistor Protection Relay
• Supply Voltage (Ue): 24-48V DC
• Reset: Manual
• Output Contacts: 1 C/O (Changeover)
• Contact Rating (AC15): 3A at 250V AC / 6A at 120V AC
• Contact Rating (DC13): 2A at 24V DC
• Mounting: 35mm DIN Rail

Label Info

• Type: LT3SM00ED
• Ue: 24V DC / 48V DC
• Standards: IEC 34-11-2 type A, VDE 0660
• Listings: UL LISTED 170M, B300-R300

Application

This relay is ideal for applications in industrial automation, HVAC systems, and material handling where motor protection against thermal overload is critical. It is used in conjunction with motors that are fitted with PTC thermistor probes.

Country of Origin

Made in France.

CO2 Impact

Opting for this reconditioned component prevents the emission of approximately 6.0 kg of CO2 compared to manufacturing a new one. This saving is equivalent to the energy used to charge a smartphone 720 times.

Availability

This is an obsolete item, but it is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question?

What is the difference between the LT3SM00ED and the LT3SA00ED?

The LT3SA00ED is the modern replacement for the obsolete LT3SM00ED. While both serve as thermistor protection relays with manual reset, the LT3SA series offers updated components and compliance with newer standards. Always check the datasheet for dimensional and electrical compatibility before replacing.

What type of thermistor sensors can be used with the LT3SM00ED?

This relay is designed to work with PTC (Positive Temperature Coefficient) thermistor probes. It monitors the resistance of the probes embedded in the motor windings. Typically, it is compatible with probes that have a cold resistance of less than 1.5 kOhm and a trip resistance between 2.7 and 3.1 kOhm.

Can I use this relay for both automatic and manual reset applications?

The LT3SM00ED model is specifically designed for manual reset. A reset is performed by pressing the 'Test/Reset' button on the front or by interrupting the power supply. For automatic reset functionality, you would need a different model from the TeSys LT3S range.

PLC2DAY is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026