Schneider TeSys Deca Overload Relays - LRD Thermal Relays

TeSys Deca LRD relays are thermal overload relays that protect three phase motors. A motor can overheat if it runs with too much load or loses a phase. The relay detects this excess current and opens the control circuit stopping the contactor. Each relay has an adjustable setting range, so you set it to the current on the motor plate. Two trip classes are common. Class 10A suits normal starts, and class 20 suits motors with a heavy or long start. The relays are differential, so they also detect phase failure and load unbalance. Each one has 1NO and 1NC auxiliary contacts, a test function, a reset selector and stop and reset buttons. They connect straight to the bottom terminals of LC1D contactors, or mount separately with a terminal block.

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Schneider TeSys Deca Overload Relays - Features

• Adjustable setting range: match the motor current
• Phase failure detection: trips if one phase is lost
• Class 10A and class 20: for normal and heavy starts
• Test, reset and stop buttons: manual or automatic reset
• Sealable cover: protects the setting

Schneider TeSys Deca Overload Relays - Technical Specifications

• Range: TeSys Deca LRD
• Type: Differential thermal overload relay
• Rated voltage: up to 690V AC. Impulse withstand voltage: 6kV
• Contacts: 1 NO + 1 NC. Signalling circuit thermal current: 5A
• LRD22: 16 to 24A, class 10A
• LRD22L: 17 to 24A, class 20
• LRD1522: 17 to 25A, class 20, for motors of about 9 to 11kW at 400V
• Operating temperature: -20°C to 60°C without derating (LRD22)
• Certifications: IEC, UL, CSA, EAC, DNV-GL and Lloyd’s Register (varies by code)

Schneider TeSys Deca Overload Relays - Compatibility and Installation Guide

• Connect directly under LC1D contactors of matching size (for example LC1D09 to D38)
• Separate mounting on DIN rail or by screws uses the LAD7B105 terminal block (sold separately)
• Set the dial to the full load current on the motor plate
• Wire the 1NC contact in series with the contactor coil
• Test the trip function after fitting
• Installation should be done by a qualified electrician

Frequently Asked Questions

Q1: How do I set the relay?
Use the current shown on the motor plate.

Q2: What does class 20 mean?
The relay allows a longer start before it trips.

Q3: Can I mount it away from the contactor?
Yes, with the LAD7B105 terminal block.

Q4: Will it trip if one phase is lost?
Yes. It is a differential relay with phase failure detection.

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