Technical Guides

How an MPCB combines short-circuit and adjustable overload protection for a motor, how it compares with breakers and overload relays, and how to set it.

Contactors and relays both switch circuits with a coil. How they differ in current, contacts, arc handling and use, plus how motor starters fit in.

Mechanical limit switches and non-contact proximity sensors compared on life, speed, environment, wiring and cost, with a guide to choosing.

What normally open and normally closed really mean, how to read the symbols, and when to choose NO or NC for switches, relays and sensors.