Solid-State Relays vs Electromechanical Relays
How solid-state relays and electromechanical relays work, how they fail, and how to choose between them for a control panel.
NPN vs PNP Sensors: Sinking, Sourcing and How to Wire Them
What NPN and PNP outputs mean, how they match sinking and sourcing input cards, and how to wire 3-wire and 2-wire DC sensors.
Contactor Coil Voltages and Coil Codes: How to Get the Right One
How contactor coils differ (AC or DC, 50 or 60 Hz, electronic) and how to read coil markings and codes so the replacement closes reliably.
Réseaux d'alimentation électrique et types de charges en Amérique du Nord
A practical overview of North American supply systems, from 120/240 V split phase to 600Y/347 V in Canada, how loads connect, and why slash ratings matter.
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...
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...
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.
Disjoncteur - Symbole électronique
A guide to the symbols used for circuit breakers, disconnectors and fuses on IEC and North American schematics, and how to find the part behind each...
Installation - Disjoncteur de branche CSA C22.2 no 5 - UL489 / Disjoncteur supplémentaire CSA C22.2 no 235 - UL1077 Disjoncteurs à boîtier moulé
UL 489 breakers and UL 1077 supplementary protectors can look identical, but only one may protect a branch circuit. Here is where each belongs and how...
