Thermal Overload Relays

279 parts

Thermal overload relays from ABB, Siemens and Schneider Electric protect 3-phase motors against sustained overcurrent. The range runs from 0.1 A to 630 A, in bimetal and electronic versions. Stoklink ships worldwide from Turkey and quotes project volumes on request.

Related families
Motor Protection Circuit Breakers (MPCB)Motor Starters & Motor ManagementSoft StartersVariable Frequency Drives (VFD)

279 parts

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Guide

Thermal Overload Relays buying guide

What's in this range

  • Siemens SIRIUS 3RU2 thermal relays and 3RB2 and 3RB3 electronic overload relays, with narrow adjustable current bands such as 0.35 to 0.50 A.
  • Schneider Electric TeSys Deca, TeSys K and Easy TeSys Protect relays, for example 12 to 18 A and 51 to 81 A bands.
  • ABB TF series thermal relays (TF42, TF65, TF96) and EF electronic overload relays up to 800 A.
  • Mounting accessories and separate mounting kits for direct attachment to contactors or stand-alone installation.

How to choose

  • Adjustable current band. Pick the relay so the motor full-load current sits inside the middle of the band.
  • Trip class (10, 10A, 20, 30) matched to the motor start time.
  • Thermal or electronic: electronic relays add phase-failure detection and wider ranges.
  • Contactor compatibility. Relays are sized to a specific contactor family and frame.
  • Reset mode and auxiliary contacts for the control circuit.
FAQ

Thermal Overload Relays questions

What does trip class 10 or 20 mean?

The class is the maximum tripping time at 7.2 times the set current, in seconds. Class 10 suits normal starts. Class 20 suits heavy starts with long acceleration.

Can I use a Siemens overload relay with another brand's contactor?

Direct mounting kits are brand specific. The electrical protection works independently, but the mechanical fit and wiring need a stand-alone mounting option.

How does Stoklink ship overload relays?

Stoklink ships worldwide from Turkey on EXW terms. Lead time depends on distributor stock, and project quantities are quoted on request.

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