Guides

Modular Contactors for Lighting & Home Automation (YCCH6 vs YCCH7)

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Quick answer: A modular contactor is a quiet, DIN-rail-mounted switch that turns a circuit on and off from a low-power control signal — used for lighting banks, water heaters, pumps, and home/building automation, not for starting motors. It clips into your distribution board like an MCB. CNC's YCCH6 (standard) and YCCH7 (with manual override)...

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...