Schneider Electric LRD14 Overload Relay

Author : harsh makwana

LRD thermal overload relays – 7…10 A – class 10A

TeSys LRD thermal overload relay, 10A/690V, thermal setting range 7-10A, tripping class 10A, for protection of 3-phase motors 4kW@400V. Differential device with phase failure and load unbalance detection. It provides a thermal adjustment dial, a manual-automatic reset selector, a test selector for the simulation of tripping, reset, and stop buttons, a flag indicator, and 2 auxiliary contacts 1NO+1NC for fault signaling. Settings are protected by a transparent cover lockable by sealing. Connection by screw clamp terminals, it connects directly to the bottom terminals of 3-pole contactors LC1D09-D38.

Description

Range	TeSys TeSys Deca
Product name	TeSys LRD TeSys Deca
product or component type	Differential thermal overload relay
Device short name	LRD
relay application	Motor protection
Product Compatibility	LC1D09 LC1D12 LC1D38 LC1D32 LC1D25 LC1D18
Network type	AC DC
Thermal overload class	Class 10A conforming to IEC 60947-4-1
Thermal protection adjustment range	7…10 A
[Ui] rated insulation voltage	Power circuit: 600 V conforming to CSA Power circuit: 600 V conforming to UL Power circuit: 690 V conforming to IEC 60947-4-1

Network frequency	0…400 Hz
Mounting support	Plate, with specific accessories Rail, with specific accessories Under contactor
Tripping threshold	1.14 +/- 0.06 Ir conforming to IEC 60947-4-1
auxiliary contact composition	1 NO + 1 NC
[Ith] conventional free air thermal current	5 A for signalling circuit
Permissible current	3 A at 120 V AC-15 for signaling circuit 0.22 A at 125 V DC-13 for signaling circuit
[Ue] rated operational voltage	690 V AC 0…400 Hz for power circuit conforming to IEC 60947-4-1
Associated fuse rating	4 A gG for signaling circuit 4 A BS for signaling circuit
[Uimp] rated impulse withstand voltage	6 kV
Phase failure sensitivity	Tripping current 130 % of Ir on two-phase, the last one at 0
Control type	Red push-button: stop Blue push-button: reset
Temperature compensation	-20…60 °C
Connections – terminals	Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² flexible without cable end Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² flexible with cable end Control circuit: screw clamp terminals 2 cable(s) 1…2.5 mm² solid without cable end Power circuit: screw clamp terminals 1 cable(s) 1.5…10 mm² flexible without cable end Power circuit: screw clamp terminals 1 cable(s) 1…4 mm² flexible with cable end Power circuit: screw clamp terminals 1 cable(s) 1…6 mm² solid without cable end
Tightening torque	Control circuit: 1.7 N.m – on screw clamp terminals Power circuit: 1.7 N.m – on screw clamp terminals

Additional information

Weight	124 g
Dimensions	7 × 4.5 × 6.6 cm

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