Schneider Electric LR2K0303 TeSys LRK Thermal Overload Relay 0.23-0.36 A Class 10A 1NO+1NC Relay

The Schneider Electric LR2K0303 is a TeSys LRK bimetallic thermal overload relay that mounts directly under a TeSys K contactor, with a 0.23-0.36 A adjustment range and a class 10A trip curve protecting 3-phase motors around 0.09 kW at 400 V.

Technical Specifications

Certifications & Standards

• UL
• CSA
• UKCA
• VDE 0660
• NF C 63-650
• BS 4941
• IEC 60947

Selection Notes

The 0.23-0.36 A dial sets the trip point for motors around 0.09 kW at 400 V; keep the dial at the motor's actual full-load current rather than the contactor's maximum rating, since over-setting defeats the class 10A overload protection. Phase-unbalance detection trips the relay on a single-phasing fault even before the thermal element reaches its class 10A curve, which the plain (non-differential) LRD/LR9D equivalents do not provide. The relay clips directly onto the LC1K contactor's bottom terminals to form a compact starter, so no separate mounting plate is needed unless the LA7K0064 terminal block is fitted for remote placement away from the contactor.