TOMZN Smart Changeover ATS Switch 2P Single Phase (125A)

Take Total Control of Your Backup Power — TOMZN Smart Changeover ATS Switch  2P Single Phase

Living and working in Pakistan means dealing with the daily reality of load-shedding, sudden voltage drops, and unpredictable power breakdowns. For decades, the standard fix has been a manual metal changeover lever — the kind you run to in the dark, slamming a heavy iron handle upward or downward to start your generator or UPS line. It is slow, disruptive, and genuinely dangerous if operated incorrectly under live conditions.

The TOMZN Smart Changeover ATS Switch 2P Single Phase (125A), available at SmartSwitch.pk, replaces that outdated approach entirely. This is an intelligent, high-capacity Automatic Transfer Switch (ATS) that continuously monitors both your incoming power lines and automatically shifts your entire property between WAPDA and your backup power system — generator, solar inverter, or UPS — in milliseconds, keeping your lights on and your sensitive appliances running without a single interruption. You never need to run to the distribution board again.

Browse our full Smart Circuit Breakers collection to see how the TOMZN Smart Changeover ATS Switch 2P Single Phase fits into a complete, automated power management setup for your home or business.

How Automatic Transfer Works — And Why It Matters

Understanding what separates an ATS from a standard manual changeover starts with how it monitors your power lines. The TOMZN Smart Changeover ATS Switch 2P Single Phase does not wait for you to notice the lights going out. Its internal control logic continuously reads the voltage and frequency of your primary line — the WAPDA or K-Electric supply — in real time.

As Eaton explains in their ATS fundamentals guide, an automatic transfer switch is a self-acting, intelligent power switching device whose principal purpose is to ensure the continuous delivery of electrical power from one of two sources to a connected load — automatically, without human intervention. The same principle operates here: the moment your primary line drops below acceptable voltage or frequency parameters, the TOMZN's internal mechanism transfers your home's entire load to the backup line. When WAPDA power returns and stabilises, the unit transfers back automatically and safely disengages your generator.

The result for a Pakistani household or business: your WiFi router stays online, your CCTV cameras continue recording without a gap, your home office workstation never loses an unsaved file, and your inverter AC keeps running through the middle of a load-shedding window — without anyone touching the distribution board.

Why 125A Capacity Matters for Pakistani Homes

A major concern when installing an automated changeover switch is whether it can safely handle your home's actual electrical load. Many cheaper switches fail under the high startup currents drawn simultaneously by multiple inverter air conditioners, water pumps, and refrigerators — they heat up, trip, or short-circuit under real-world Pakistani household conditions.

The TOMZN Smart Changeover ATS Switch 2P Single Phase is rated at a 125A frame capacity — substantial enough for large homes, multi-story villas, and commercial offices running multiple heavy appliances on a single phase at the same time. This is the correct sizing for households that cannot afford an unexpected ATS failure during a power transition event.

Combined with an 8kV surge resistance rating, the switch also absorbs the voltage spikes and surges that are a daily reality on Pakistani distribution networks — protecting both the switch itself and every downstream appliance from the overvoltage damage that silently shortens the life of electronics.

eWeLink Smart App — Live Monitoring and Remote Control

What separates the TOMZN Smart Changeover ATS Switch 2P Single Phase from a standard mechanical ATS is its built-in WiFi connectivity, operating on the eWeLink smart platform — the same ecosystem powering thousands of compatible devices worldwide. As the official eWeLink platform explains, eWeLink delivers remote monitoring, scheduling, and automation control from a single free mobile app available on Android and iOS.

Pair the switch to your home's 2.4GHz WiFi network, download the free eWeLink app, and your TOMZN Smart Changeover ATS Switch 2P Single Phase becomes a fully remotely managed power controller accessible from anywhere in Pakistan or internationally.

What the eWeLink app gives you:

• Live source monitoring — see at a glance whether your property is currently drawing from WAPDA, your generator, or your solar inverter, updated in real time
• Remote manual override — force a transfer to your backup line from your phone for generator testing, solar optimisation, or scheduled maintenance without visiting the distribution board
• Smart loop timing and schedules — set exact operational windows for generator use; for example, allow generator input only between 10 PM and 6 AM to prevent fuel waste during daytime hours
• Switching history log — a complete timestamped record of every transfer event to identify patterns in your local load-shedding schedule
• Automation routines — combine with other eWeLink-compatible smart devices to build integrated responses, such as a push notification every time a transfer event occurs

Three Modes — Auto, Manual, and Safety Locked

Every electrical setup needs a physical failsafe, and TOMZN has built one directly into this switch's hardware. The front panel features a clear physical toggle that lets you shift between Auto mode (fully automatic ATS operation), Manual mode (you initiate transfers yourself), and a Safety Lock that ensures both the WAPDA and generator lines can never be bridged simultaneously under any condition.

This mechanical interlock is a critical safety feature. Bridging two live supply lines simultaneously — even for a fraction of a second — creates a dangerous backfeed event that can damage transformers, destroy connected appliances, and in severe cases create fire risk in the distribution board. The TOMZN Smart Changeover ATS Switch 2P Single Phase eliminates this risk at the hardware level, regardless of app or software status.

Pair It With SmartSwitch.pk's Smart Breaker Range

The TOMZN Smart Changeover ATS Switch 2P Single Phase handles your dual-source switching at the distribution board entry point. For per-circuit app-based control and protection downstream, pair it with our WiFi 63A DC Smart Breaker on solar battery and DC circuits, or explore our full DC Smart Circuit Breaker category for compatible protection on your solar and backup power lines.

For circuit-level WiFi control of your individual load lines — lights, motors, AC units — combine the ATS with smart switches and plugs from our WiFi Smart Switches and WiFi Smart Plugs ranges. Everything integrates into the same Tuya or eWeLink app ecosystem for centralised control.

Who Needs the TOMZN Smart Changeover ATS Switch 2P Single Phase

Modern homes and villas — keep refrigerators running, prevent smart TVs from resetting, and maintain cooling across bedrooms through unpredictable nighttime load-shedding windows without touching the distribution board.

Home offices and remote workers — keep internet routers, computers, and desktop workstations online through outages without losing unsaved files or dropping video calls.

Retail shops and commercial spaces — protect billing computers, security systems, and POS terminals from abrupt shutdowns that cause data loss and business disruption during trading hours.

Solar hybrid homeowners — manage the automatic transfer between solar inverter output and WAPDA grid power with scheduled routines that maximise solar use during peak generation hours and minimise grid draw during expensive evening tariff windows.

40A geyser and motor users — if you are already using our 40A Smart Switch for Geyser & Motor for individual high-load appliances, the TOMZN ATS adds distribution-board-level source switching so those appliances stay powered through outages automatically, without manual changeover.

Order From SmartSwitch.pk

Every order at SmartSwitch.pk ships with a 30-day warranty, free shipping on orders above ₨2,000, and a 7% discount when paying by bank transfer or prepaid. Message us on WhatsApp from the product page for fast order confirmation and nationwide delivery across Pakistan.

Stop managing your backup power by hand. Let the TOMZN Smart Changeover ATS Switch 2P Single Phase handle every transfer automatically — every time, in milliseconds, without you lifting a finger.