Guides

What Is a CPS? The All-in-One Motor Starter (Control & Protective Switching)

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Quick answer: A CPS (Control & Protective Switching device) is an all-in-one motor starter that combines what normally takes three separate devices — a contactor, an overload relay, and short-circuit protection — into a single compact unit. CNC's YCKB7 covers up to 63 A. It saves panel space, cuts wiring, and gives a motor coordinated...

Star-Delta Starter: How It Works and When You Need One

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A star-delta starter reduces a motor's starting current by first running the windings in star — which puts only 1/√3 of the line voltage across each winding — then switching to delta for normal running. This cuts both starting current and starting torque to about a third of their direct-on-line values. It is used...

DOL Starter: What It Is, Wiring, and How to Size One

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A DOL (Direct-On-Line) starter connects a motor straight to full mains voltage using a magnetic contactor, with a thermal overload relay for protection and start/stop buttons for control. It is the simplest and cheapest way to start a three-phase motor — suitable up to roughly 5–7.5 kW, above which the full starting current (6–8 × running...

Motor Overload Relay Pakistan 2026: Sizing Guide

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Motor Overload Relay Pakistan 2026 — Thermal Overload Sizing & Selection Last verified: 2026-05-29 · Author: CNC Electric Pakistan Engineering Team · Reading time: 7 min The motor overload relay (thermal overload, OL relay) is the device that prevents a motor from burning out when it draws more current than its nameplate FLA for...