Guides

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...

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)...

Quick answer: An EV charger needs a dedicated earth electrode with a measured resistance below 5 ohms — and it has to be measured with an earth tester, not assumed. This is the item most Pakistani installs skip or fake, and it quietly disables everything else: your RCBO can only clear a fault if there's...

Quick answer: An EV charger produces smooth DC leakage current under fault, and that blinds the ordinary Type AC RCD fitted in most Pakistani boards — so a normal RCD is never acceptable. You need one of two things: a Type A RCBO/RCD, but only if your charger has built-in 6 mA DC fault detection (check the...

Quick answer: A 7 kW single-phase EV charger draws about 30–32 amps continuously for hours at a time, so it needs a 40 A MCB — not a 32 A one. But the breaker is only half the job. On its own it does nothing to stop electrocution or a DC earth fault, so a 7 kW charger circuit...

A practical buyer's guide to choosing a WiFi smart breaker in Pakistan. Learn the real selection criteria in order — pole & amperage sizing (1P/2P/4P, 16–125A), RCBO earth-leakage protection, built-in kWh metering, IEC 60898-1 / 61009-1 certification (and how to spot fake ratings), local warranty & after-sales, manual override when WiFi is down, app...

DC-coupled vs AC-coupled solar Pakistan 2026: hybrid inverter vs add-on battery, efficiency, retrofit, cost. Which architecture for new vs existing systems. Buyer guide.

Single-phasing & voltage-imbalance motor protection Pakistan 2026: why 3-phase motors burn, phase-failure relay, overload, %imbalance limits. Protect pumps, compressors.

Distribution transformer sizing Pakistan 2026: kVA calc from connected load + diversity + growth, no-load vs load losses, vector group Dyn11, ONAN, IEC 60076. Industrial.

Switchgear preventive maintenance schedule Pakistan 2026: monthly/quarterly/annual checklist for MCCB, ACB, DB, busbar — thermography, torque, IR test. IEC 61439 / NFPA 70B.