Schneider Electric LRD21 TeSys Deca Thermal Overload Relay 12-18A Class 10A IP20

MPN: LRD21
PPN: SCH-LRD21

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Description

TeSys LRD overload relays are designed to be used with TeSys D contactors to make a motor starter. This overload relay can be used with 9 amp through 38 amp TeSys D contactors. These differential thermal overload relays detect over currents in the lines to the motor. When an overcurrent is detected the overload relay working with the contactor will disconnect the power to the motor. This will minimize the damage to the motor windings. This overload relay has an adjustable trip current rating of 12 to 18 amperes. This trip current rating is calibrated per Class 10A. Multi standards certified (IEC, UL, CSA, CCC, EAC, ATEX, Marine).

Features

The LRD21 is a TeSys Deca differential thermal overload relay designed to protect AC motors against overloads and phase failures. It acts as a critical safety barrier by monitoring the current drawn by the motor and automatically tripping the associated contactor if the current stays above the set limit, preventing permanent insulation damage and motor burnout.
Featuring a precise adjustment dial ranging from 12 to 18 Amps, the LRD21 allows you to tailor the protection profile to your motor's specific Full Load Amps (FLA). This ensures a high level of accuracy that prevents nuisance tripping during normal operation while providing a rapid response to mechanical jams or electrical faults.
This relay features a "differential" design, making it highly sensitive to phase loss or phase unbalance. If one phase fails a common cause of rapid motor failure the LRD21 detects the discrepancy and trips the circuit faster than a standard overload, shielding your equipment from the extreme heat buildup caused by single-phasing.
The LRD21 is equipped with 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contacts. These allow for seamless integration into your control logic; the NC contact is used to break the contactor coil circuit to stop the motor, while the NO contact can trigger a "Fault" pilot light or send a signal to a PLC for immediate diagnostic feedback.
The unit features a blue selector lever that allows you to choose between Manual or Automatic reset modes. Manual mode ensures a technician must physically inspect the machinery before restarting, while the integrated "Test" and "Stop" buttons allow for safe verification of the control circuit without disconnecting any wiring.

Documentation & Downloads

Specifications

Key Specifications

Country of Origin	Brazil, France, Thailand, United States

Depth	70 mm

Important Information Attributes

Persona Type Ids	EU, LC, OM, OM8, PB, SC
Market Segmentation Id	COMMERCIAL, INDUSTRIAL
Associated Fuse Rating	4 A gG for signalling circuit, 4 A BS for signalling circuit
Mounting Support	plate, with specific accessories, rail, with specific accessories, under contactor
Permissible Current	1.5 A 240 V AC-15 signalling circuit, 0.1 A 250 V DC-13 signalling circuit
Range	TeSys, TeSys Deca
Certificate Agency	IEC, UL, CSA, CCC, EAC, BV, RINA, DNV-GL, LROS (Lloyds register of shipping), ATEX INERIS, UKCA
Connections - Terminals	power circuit screw clamp terminals 1 1-4 mm² flexible with cable end, power circuit screw clamp terminals 1 1-6 mm² solid, control circuit screw clamp terminals 2 1-2.5 mm² flexible without cable end, control circuit screw clamp terminals 2 1-2.5 mm² flexible with cable end, control circuit screw clamp terminals 2 1-2.5 mm² solid, power circuit screw clamp terminals 1 1.5-10 mm² flexible without cable end
Carbon Footprint Of The End-of-life Phase [C1 To C4]	0.2 kg CO2 eq., 0.21678519324421383
Carbon Footprint Of The Manufacturing Phase [A1 To A3]	1 kg CO2 eq., 1.0267614686619415
Local Data Status	Publishable
Return Indicator	Y
Stock Policy	2
Serviceability	No
Weee Scope	In
Scope Perimeter	At least in Europe
End Of Life Doc Ref	ENVEOLI0802006
Reach Full Compliance Status Id	NOT_CONTAINING_SVHC
Rohs Eur In Scope	Yes
Rohs Eur Conformity Date	0627
China Rohs In Scope	No
With Recycled Cardboard	Yes
Product Contributes To Saved And Avoided Emissions	No
Tier	1
Function Option	Standard
Compatibility Code	LRD
Device Short Name	LRD
Flame Retardance	V1 conforming to UL 94
Phase Failure Sensitivity	tripping current 130 % of Ir on two phase, the last one at 0
Product Or Component Type	differential thermal overload relay
Returnability	Yes
Sustainable Packaging	No
Thermal Protection Adjustment Range	12-18 A
Total Lifecycle Carbon Footprint	13 kg CO2 eq.
Weee Label	The product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins.
Pep Code	ENVPEP0802006EN
Pep Verification Date	2025-08-05
Psr Version	PSR-0005-ed3-EN-2023 06 06
Data Source	extrapolated product
Functional-unit Quantity	1
Reference Lifetime In Y	20
Energy Model - Manufacturing [A1-a3]	Europe, EU-27
Energy Model - Use [B6]	Electricity Mix; Low voltage; 2018; Europe, EU-27
Recyclability Potential In %	50
Width Nominal	45 mm
[Ue] Rated Operational Voltage	690 V AC 0...400 Hz power circuit IEC 60947-4-1
Nbr. Of Units In Pkg.	1
Take-back	No
Customs Code	8536490080

Persona Type Names	End User, Contractor, Original Equipment Manufacturer, OEM - Control Panelbuilder, Panel Builder, Electrician
Market Segmentation	Commercial, Industrial
Mechanical Robustness	vibrations6 Gn IEC 60068-2-6, shocks15 Gn for 11 ms IEC 60068-2-7
Network Type	AC, DC
Product Name	TeSys LRD, TeSys Deca
Temperature Compensation	-20-60 °C, -20-60 °C
[Ui] Rated Insulation Voltage	power circuit 600 V CSA, power circuit 600 V ULpower circuit 690 V IEC 60947-4-1
Carbon Footprint Of The Distribution Phase [A4]	0.024163479198025903, 0 kg CO2 eq.
Carbon Footprint Of The Installation Phase [A5]	0.01635889814277638, 0 kg CO2 eq.
Carbon Footprint Of The Use Phase [B2 B3 B4 B6]	12 kg CO2 eq., 11.633004615445152
Local Publishable Date	2026-06-27
Stocking Flag	N
Device Type	Relay, Control & Measurement - Protection relay
Traceability	No
Weee Product Category	5
Eoli Availability Display	Yes
Reach Full Compliance Status	Free of Substances of Very High Concern above the threshold
Reach Compliance Directive	Free of Substances of Very High Concern above the threshold
Rohs Eur Status	Compliant
Rohs Eur Full Compliance Status	Compliant
China Rohs Label	1
Without Single Use Plastic	Yes
Tier Id	1
Function Option Id	STANDARD
Product Kit Identifier	N
Control Type	Red push-button stopBlue push-button reset
Dielectric Strength	1.89 kV 50 Hz IEC 60947-1
Network Frequency	0...400 Hz
Product Availability	Stock - Normally stocked in distribution facility
Relay Application	motor protection
Software Version	v6.1
Thermal Overload Class	class 10A IEC 60947-4-1
Tightening Torque	control circuit 1.7 N.m screw clamp terminalspower circuit 2.5 N.m screw clamp terminals
Tripping Threshold	1.14 +/- 0.06 Ir IEC 60947-4-1
R Thermal Protection Adj Range	12-18 A
Database Version	2023-02
Pcr Version	PCR-4-ed4-EN-2021 09 06
Type Of Verification For The Pep	Independent internal review
Functional-unit Description	Other switchgear and controlgear solutions mentioned in the scope (e.g. fuses TC32, all-or-nothing relays TC94, Measuring relays and protection equipment TC95), apply the general rules of PCR and mention in the accompanying report the functional unit, the reference product characteristics, the reference lifetime and the use scenario which are applied consistently with the relevant IEC technical standards.
Functional-unit Unit	unit
Energy Consumption On Product Lifetime In Kwh	28.3824
Energy Model - Installation [A5]	Electricity Mix; Low voltage; 2018; Europe, EU-27
Energy Model - End Of Life [C1-c4]	Electricity Mix; Low voltage; 2018; Europe, EU-27
Height Nominal	66 mm
[Ith] Conventional Free Air Thermal Current	5 A signalling circuit
[Uimp] Rated Impulse Withstand Voltage	6 kV
Package Weight(Lbs)	144.000 g
Warranty (In Months)	18

Environment Attributes Main

China Rohs Regulation	Product out of China RoHS scope , Pro-active China RoHS declaration (out of China RoHS legal scope)
Ambient Air Temperature For Storage	-60-70 °C, -60-70 °C
Take Back	No
Recycled Metal Content At Cr Level	0 %
Mercury Free	Yes
Circularity Profile	ENVEOLI0802006
Environmental Disclosure	ENVPEP0802006EN
Ip Degree Of Protection	IP20 conforming to IEC 60529
Packaging Without Single Use Plastic	Yes
Reach Regulation	Free of Substances of Very High Concern above the threshold
Pep Verification Date	2025-08-05
Psr Version	PSR-0005-ed3-EN-2023 06 06

Ambient Air Temperature For Operation	-20-60 °C without derating IEC 60947-4-1, -20-60 °C without derating IEC 60947-4-1, -20-60 °C without derating IEC 60947-4-1-20-60 °C without derating IEC 60947-4-1, -20-60 °C without derating IEC 60947-4-1, -20-60 °C without derating IEC 60947-4-1
Product Compatibility	LC1D32, LC1D18, LC1D25, LC1D38
Reach Free Shvc	Yes
Toxic Heavy Metal Free	Yes
Carbon Footprint	12.917073654692109
Climatic Withstand	IACS E10
Eu Rohs Directive	Compliant
Packaging Made With Recycled Cardboard	Yes
Reach Free Of Svhc	Yes
Pep Code	ENVPEP0802006EN
Pcr Version	PCR-4-ed4-EN-2021 09 06
Type Of Verification For The Pep	Independent internal review