Fonctionnement : minuteries
On-delay, off-delay, interval, one-shot, flasher and star-delta: how each timer function behaves, what starts the timing and what to check when you replace a timer.
3JIndustry · Guides techniques
Guides techniques et actualités
Fonctionnement : capteurs inductifs, capacitifs, photoélectriques et à ultrasons
A practical comparison of inductive, capacitive, photoelectric and ultrasonic sensors: how each one detects a target, where it works well and how to pick a replacement.
Fonctionnement : capteurs inductifs et capacitifs
Inductive sensors detect metal; capacitive sensors detect almost anything. Learn how each works, how to choose, and how sensing distance, mounting and target material affect detection.
Fonctionnement : relais
A practical guide to electromechanical relays: how the coil and contacts work, how to read contact forms and ratings, and when to use a contactor or...
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...
Harmoniques (énergie électrique)
Harmonics are currents and voltages at multiples of the supply frequency, produced by drives, rectifiers and electronic loads. Learn how THD is defined and measured.
Effet des harmoniques
Harmonics from drives and electronic loads overheat transformers, neutrals and motors, stress capacitor banks and cause nuisance trips. Here is what happens and how plants reduce...
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.
Tableau / Table des tailles et propriétés du calibre des fils américains (AWG)
An American Wire Gauge table from 4/0 to 30 AWG, computed from the gauge definition, with copper resistance, voltage-drop examples and why ampacity must come from...
Pouvoir de coupure (SCCR)
What a short-circuit current rating is, how it differs from interrupting rating, and why one low-rated component can limit the SCCR of a whole control panel.
Normes et certifications nord-américaines
How North American electrical standards are organized (NEC, CEC, UL 508A, UL and CSA product standards) and how to read UL, cULus and CSA marks on...
