Motor protection devices and thermal overload relays

Compare motor protection and thermal overload relays by specific application and exact device. Separate protection device, starter, auxiliary contacts and enclosure instead of treating them as a ready-made set.

Choose the exact type and series

The range includes motor protection devices, thermal versions and motor starters from different ranges, including TeSys, MS and MPX. The shared category does not make these equivalent replacements. Keep the full name and series to distinguish the main device from a block, contact or enclosure intended to supplement it.

For a replacement, use the existing device's full code and motor data. Do not choose solely by a similar power value or external size. Compatibility must be established for the specific equipment, including the supplementary parts required. An accessory from one series should not be transferred to another solely by brand.

Distinguish ranges and other designations

This group includes current, pole, voltage and contact designations. For the chosen item, check which is a range, which is an individual nominal parameter and under what conditions it is stated. Do not turn one range's endpoint into a general characteristic of the whole family. Compare data for different parameters as separate items.

Also clarify whether the specific offer includes auxiliary contacts, controls or other accessories. The number of poles does not replace a description of these parts. If preparing a new assembly, list the main device and supplementary elements. If replacing only one part, retain data for the other components with which it must be coordinated.

Consider the housing and controls separately

For a box or complete enclosure version, check its own package contents and environmental conditions. IP concerns ingress of solid objects and water, while IK is a separate mechanical impact measure. These designations should not be confused with electrical parameters of the internal device or transferred between assembled solutions.

For the contactor part, continue to contactors, and for another control area, to variable frequency drives. The general motor control and protection section helps distinguish the tasks. Selection must retain the specific motor, application requirements and exact references without determining settings or wiring methods from the catalogue name.