The Schneider DPER340 is a differential thermal overload relay from the Easy TeSys range, designed for motor protection in three-phase circuits. It covers a 30-40 A thermal protection adjustment range and trips at 1.14 ± 0.06 Ir per IEC 60947-4-1, with a Class 10 trip class — meaning it will open the circuit within 10 seconds at 7.2× Ir, matching standard motor start profiles for pumps, fans, and compressors.
The IP20 finger-safe enclosure (IEC 60529) suits panel-mount installations where the relay is enclosed. Control circuit connections use screw-clamp terminals accepting 1-2.5 mm²; power circuit screw connectors accept 2.5-25 mm². Tightening torque for the control circuit is 1.7 N·m; power circuit torque depends on conductor size — 5 N·m for 2.5-16 mm², 7 N·m for 16-25 mm².
Approvals include UL 60947-4-1, UL 60947-5-1, CSA C22.2 No. 60947-4-1, CSA C22.2 No. 60947-5-1, EN/IEC 60947-4-1, EN/IEC 60947-5-1, and EN 50495 for explosive-atmosphere applications. Rated insulation voltage is 600 V (UL) / 690 V (IEC); rated operational voltage for the power circuit is 300 V AC at 0-400 Hz. Dielectric strength tested at 1.89 kV 50 Hz per IEC 60947-1. The auxiliary contact composition is 1 NO + 1 NC.