In the dynamic area of motor protection, the SEL-710 and SEL-710-5 Motor Protection Relays stand out for their innovative thermal model that provides comprehensive thermal overload protection.

This is an article that explores the significant advantages of utilizing SEL Coordination Tool for setting the thermal element in these relays, focusing on the ANSI 49 overload thermal protection for induction motors.

Let’s go into this application guide, using a practical example with specific numerical information:

SF = 1.15, (Service Factor)

LRA = 6.5xFLA, (Locked Rotor Ampere)

LRTHOT = 17s. (Locked Rotor Time Hot)

Optimizing Motor Protection

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