Schneider TeSys D Overload Relays - LRD Series, Class 10A and 20

TeSys D LRD relays protect three phase motors from overload. Picking the right one is mostly about two things, the setting range and the trip class. The setting range must include the full load current on the motor plate. For example, a motor of 20A fits the LRD22, which covers 16 to 24A. A 25A motor fits the LRD1522, which covers 17 to 25A. The trip class tells how long the relay allows a motor to start. Class 10A suits normal motors, and class 20 suits motors with a longer start, such as large fans. Each relay has 1NO and 1NC contacts, a manual or automatic reset selector and a test function. It also detects phase failure. Always set the dial to the motor current, not to the contactor rating.

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Schneider TeSys D Overload Relays - Features

• Easy selection: choose by setting range and trip class
• Phase loss detection: stops the motor on single phasing
• Reset options: manual or automatic
• Sealable cover: prevents changes to the setting
• Signal contacts: 1NO + 1NC for fault signalling

Schneider TeSys D Overload Relays - Technical Specifications

• Range: TeSys D LRD
• Type: Differential thermal overload relay
• Trip class: 10A and 20
• Contacts: 1 NO + 1 NC
• Rated voltage: up to 690V AC
• LRD22: 16 to 24A, class 10A
• LRD22L: 17 to 24A, class 20
• LRD1522: 17 to 25A, class 20
• Phase failure: trips at 130% of the set current on two phases when the third is at zero

Schneider TeSys D Overload Relays - Compatibility and Installation Guide

• Connect straight under the matching LC1D contactor
• Mount separately with a terminal block if the contactor is elsewhere
• Set the dial to the motor plate current
• Use the 1NC contact in the contactor coil circuit
• Press the test button after fitting
• Installation should be done by a qualified electrician

Frequently Asked Questions

Q1: How do I pick the range?
The motor plate current should sit inside the range.

Q2: Which is more better Class 10A or class 20?
Use class 20 for motors with a heavy or long start.

Q3: Where do I set the dial?
At the motor plate current.

Q4: What does phase failure detection do?
It protects the motor from overheating and it trips the relay if one phase is lost.

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