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Schneider Electric LRD21L6

Schneider LRD21L6 TeSys Deca thermal overload relay, 12-18 A, class 20

MPNLRD21L6
Active

Schneider Electric TeSys Deca LRD21L6 differential thermal overload relay, 12-18 A, class 20, 1 NO + 1 NC auxiliary contacts, IP20, lugs-ring terminals M4, IEC/UL/CSA/ATEX certified.

$104.84Ref. price · indicative, final on quote
Schneider Electric LRD21L6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LRD21L6 key specifications
ParameterValue
Control typeRed push-button stop Blue push-button reset
Network typeDC AC
Product or component typeDifferential thermal overload relay
Climatic withstandIACS E10
VoltagePower circuit 600 V CSA Power circuit 600 V UL Power circuit 690 V IEC 60947-4-1
[Ue] rated operational voltage690 V AC 0...400 Hz power circuit IEC 60947-4-1
[Uimp] rated impulse withstand voltage6 kV
Permissible current3 A 120 V AC-15 signalling circuit 0.22 A 125 V DC-13 signalling circuit
[Ith] conventional free air thermal current5 A signalling circuit
Network frequency0...400 Hz
Phase failure sensitivityTripping current 130 % of Ir on two phase, the last one at 0
IP degree of protectionIP20 conforming to IEC 60529

All specifications

LRD21L6 additional specifications
ParameterValue
Mounting supportPlate, with specific accessories Rail, with specific accessories Under contactor
Connections - terminalsControl circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible without cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible with cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) solid without cable end Power circuit lugs-ring terminals
Depth3.0 in (76 mm)
Width1.8 in (45 mm)
Height2.6 in (66 mm)
StandardsEN/IEC 60947-4-1 EN/IEC 60947-5-1 UL 60947-4-1 UL 60947-5-1 CSA C22.2 No 60947-4-1 CSA C22.2 No 60947-5-1 EN 50495
RangeTeSys TeSys Deca
CategoryUS10I1222347
Device short nameLRD
Relay applicationMotor protection
Tightening torqueControl circuit 15.05 lbf.in (1.7 N.m) screw clamp terminals Power circuit 20.4 lbf.in (2.3 N.m) lugs-ring terminals M4
Tripping threshold1.14 +/- 0.06 Ir IEC 60947-4-1
Dielectric strength1.89 kV 50 Hz IEC 60947-1
Mechanical robustnessShocks15 Gn for 11 ms IEC 60068-2-7 Vibrations3 GN IEC 60068-2-6
Associated fuse rating4 A gG for signalling circuit 4 A BS for signalling circuit
Thermal overload classClass 20 IEC 60947-4-1
Temperature compensation-4...140 °F (-20...60 °C)
Auxiliary contact composition1 NO + 1 NC
Ambient air temperature for storage-76...158 °F (-60...70 °C)
Thermal protection adjustment range12...18 A
Ambient air temperature for operation-4...140 °F (-20...60 °C) without derating IEC 60947-4-1

Product details

Overview

The LRD21L6 is a TeSys Deca differential thermal overload relay rated 12-18 A with a class 20 trip curve, providing motor protection with phase failure sensitivity that trips at 130 % of Ir on two phases with the third at zero. It carries 1 NO + 1 NC auxiliary contacts, mounts directly under LC1D18 through LC1D38 contactors, and is certified to IEC, UL, CSA, ATEX, INERIS, and UKCA standards.

Terminal comparison vs LRD21TQ

The LRD21L6 uses lugs-ring terminals on the power circuit with a torque of 20.4 lbf.in (2.3 N.m) at M4, while the LRD21TQ uses screw clamp terminals at 22.1 lbf.in (2.5 N.m). The control circuit terminals are identical screw clamp type at 15.05 lbf.in (1.7 N.m).

The LRD21L6 is an active catalog item; lead time is confirmed via RFQ. No end-of-life notice is published.

MPN
LRD21L6