Replacing a Legacy Variable Frequency Drive: What to Check
A checklist for replacing an older variable frequency drive with an identical used spare or a current-generation model, beyond the HP or kW rating.
Overload Relays: Thermal vs Electronic and Trip Classes 10, 20, 30
How thermal and electronic overload relays protect motors, what trip classes 10, 20 and 30 mean, and how to set and reset a relay correctly.
Manual Motor Starters (MPCB): How They Work and How to Set Them
How manual motor starters (MPCBs) such as PKZM, GV2 and 140M combine overload and short-circuit protection, and how to set them to the motor full-load current.
Facteur de puissance
Power factor tells you how much of the current a load draws does useful work. This guide covers the power triangle, why utilities penalize low power...
Catégories d’emploi IEC des contacteurs - Type d’application
What IEC utilization categories such as AC-1, AC-3, AC-4, AC-15 and DC-13 mean, with tables of typical applications and tips for comparing contactor ratings.
Contacteur - application
How contactors work, what AC-3, AC-1 and AC-4 ratings mean, and a step-by-step method to select or replace a contactor, including reversing pairs and interlocks.
Courant nominal du moteur IEC - Selon la norme IEC 60947-4-1, annexe G - PUISSANCE NOMINALE DU MOTEUR EN KW
How to read a kW-to-current table for IEC motors, use the nameplate correctly and convert kilowatts to horsepower.
Courant nominal du moteur UL / CSA - Selon UL508
A practical guide to horsepower-to-FLA tables for three-phase motors and to the difference between nameplate current and code-table current in North America.
Installation – Sectionneurs : UL 98 / CSA C22.2 No. 4 et UL 508 / CSA C22.2 No. 14
UL 98 safety switches and UL 508 manual motor controllers can look alike, but the code allows them in different places. Learn where each may be...
