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If you’ve browsed our UPS / AVR category, you’ve probably noticed it holds two very different kinds of products: uninterruptible power supplies (UPS) like the APC SRV3KI Easy UPS On-Line SRV 3000VA 230V (Rs. 277,097), and automatic voltage stabilizers like the STABIMATIC WSRS-3000 Automatic Voltage Stabilizer (Rs. 14,213). Both sit between the wall socket and your appliances, and both are marketed as “power protection” — but they don’t do the same job, and picking the wrong one leaves a real gap in your protection.
A UPS contains a battery. When the power goes out completely — which, given how common load-shedding is across Pakistan, is a real everyday scenario — the UPS switches your connected equipment onto battery power, keeping it running through the outage. The APC SRV3KI is a 3000VA / 2400W on-line, double-conversion UPS that continuously produces pure sine wave power rather than switching over after a delay, and lists an 88% efficiency rating at full load with roughly 4 minutes 24 seconds of runtime at full load. That short full-load runtime is typical of on-line UPS units designed to bridge you to a generator or simply protect against short outages and sags, not to run a household for hours.
At the top end of the category, the Eaton 9PX10KSP Online UPS 10kVA 9kW (Rs. 315,840, down from Rs. 336,000) is built for server rooms and network racks. It’s rack/tower convertible, ships with a network management card, uses hot-swappable batteries with Eaton’s ABM battery technology for extended battery life, and comes with a 3-year onsite parts-and-labor service plan with 24×7 next-business-day support — the kind of coverage commercial IT infrastructure needs.
An automatic voltage stabilizer (AVR) has no battery at all. Its job is to watch the incoming voltage and correct it in real time, so appliances always see a steady output even when the grid is delivering too much or too little. The STABIMATIC WSRS-3000 is built for exactly this — automatic voltage regulation with overload, thermal, and surge protection in a metal enclosure, aimed at general home and office appliances. Similarly, the Stabimatic GL-1100C Automatic Voltage Regulator (Rs. 14,739) is rated at 1100VA and holds output to 220V ±1% across an input range of roughly 140V–260V.
Because there’s no battery, a stabilizer can’t keep anything running through a total blackout. What it does instead is protect equipment from the damage caused by voltage swings, spikes, and brownouts on the local grid — the kind of fluctuation that can shorten the life of motors, compressors, and electronics over time even when the power never fully cuts out.
No. A stabilizer like the STABIMATIC WSRS-3000 corrects voltage but has no battery, so it cannot keep equipment powered during a complete outage. For backup power you need a battery-based UPS such as the APC SRV3KI.
Yes, on-line double-conversion units like the APC SRV3KI and Eaton 9PX10KSP continuously regenerate clean pure sine wave output, which naturally smooths out incoming voltage fluctuations as part of how they operate.
In this catalogue, stabilizers are generally the more affordable entry point — the STABIMATIC WSRS-3000 is Rs. 14,213 — while UPS units with battery backup and on-line double-conversion technology, such as the APC SRV3KI at Rs. 277,097, cost significantly more.
For business-critical use, it’s worth considering. The Eaton 9PX10KSP comes bundled with a 3-year onsite, parts-and-labor, 24×7 next-business-day service plan, which matters for equipment supporting servers or networking infrastructure that can’t tolerate long downtime.
