AC Stabilizer for Split & Window AC | 3, 4 & 5 kVA

+91-9999195859 servolinkstabilizerindia@gmail.com

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Overview

AC Stabilizer

One Stabilizer, One AC, Full Compressor Protection

Servolink AC stabilizers protect one air conditioner from low voltage, high voltage and the sudden restart that slowly kills compressors.

The compressor is the costliest part of an AC, and it is also the part that suffers most from bad voltage. On low voltage it pulls extra current and heats up; on high voltage the PCB and fan motor burn; and when power comes back after a cut, the compressor tries to start against full gas pressure.

Our AC stabilizer handles all three: it corrects the voltage, cuts off the AC when the supply goes outside the safe range, and holds the AC off for a time delay after every power cut, so the gas pressure settles before the compressor starts again.

SERVOLINK AC stabilizers are made in 3 kVA (0.5–1 ton AC), 4 kVA (1.5 ton AC) and 5 kVA (2 ton AC) ratings, wall mounted, with a digital display that shows the input and output voltage.

Built with Servolink's dedication to quality, ensuring consistent performance and peace of mind.

Servolink digital AC stabilizer, wall mounted

Digital Display

Micro Controller Based

The Problem

Why Your AC Needs Its Own Stabilizer

An air conditioner is the single biggest load in most homes, and it is also the most sensitive one. Its compressor motor is designed for a narrow voltage band around 230 V. When the voltage drops, the winding heats up and the start capacitor is stressed. When the voltage shoots up, the first parts to fail are the PCB and the fan motor.

The worst moment for an AC is not low voltage itself — it is the restart. After a power cut or a sudden dip, the refrigerant inside is still at high pressure. If the compressor tries to start against that pressure, it draws a very heavy current. This happens most on summer nights, exactly when the whole colony runs ACs together and the supply keeps dipping and coming back.

A compressor replacement costs many times more than an AC stabilizer. That is why an AC needs a stabilizer with a time delay of its own, sized for its own load.

Engineering

Features

Compressor Time DelayAfter every power cut or cut-off, the output switches on only after a time delay, so the compressor never restarts against full gas pressure.

High / Low Voltage Cut-OffIf the input goes outside the working range, the output is disconnected, and it reconnects automatically once the voltage is back to normal.

Digital DisplayShows input and output voltage, so you can see the supply condition at a glance.

Relay Type CorrectionRelays switch between the transformer taps (step tapping) to raise or lower the voltage. Simple, fast and low cost.

Wall MountedFixes on the wall near the AC, off the floor, with no space taken in the room.

Copper Wound TransformerWound in our own factory in Ghaziabad.

How It Works

How an AC Stabilizer Works

Inside the AC stabilizer is a toroidal transformer with several tappings and a set of relays. The control card reads the input voltage all the time. When the voltage drops, it switches a relay to a higher tapping, which boosts the output; when the voltage rises, it switches to a lower tapping, which reduces it. Each relay step corrects the voltage by a fixed amount, so the output stays inside a safe band around 220 V ±10% (about 200–240 V).

This step correction is right for an AC, because an AC compressor needs a voltage inside a safe range, not an exact voltage. For equipment that needs ±1% accuracy, or for a whole house, a servo stabilizer is the better choice.

Sizing

Which kVA for Your AC?

AC capacity	Recommended AC stabilizer
Up to 1 ton	3 kVA
1.5 ton	4 kVA
2 ton	5 kVA

For more than one AC, or for the whole house, use a single phase servo stabilizer instead — see our kVA calculator.

Compare

AC Stabilizer or Servo Stabilizer?

Point	AC Stabilizer	Single Phase Servo Stabilizer
Protects	One AC	Whole house, shop or office
Correction	In steps, through relays	Smooth, through motor-driven variac
Output accuracy	Safe band around 220 V ±10%	230 V ±1%
Ratings	3 – 5 kVA	3 – 50 kVA
Mounting	Wall mounted	Floor standing
Best for	A single split or window AC	Many ACs, appliances and sensitive equipment together

Technical Data

Specification

Brand	SERVOLINK
Product Type	AC Stabilizer, relay type (step tapping)
Capacity	3, 4 & 5 kVA
Model	SL5KAC / SL4KAC / SL3KAC
Input Working Range	90–280 V / 110–280 V / 140–280 V / 170–280 V
Output Voltage	200–240 V
Frequency	50 Hz
Time Delay	5-10 seconds
Protection	High/low voltage cut-off, time delay
Display	Digital, input and output voltage
Transformer	Copper wound, made in-house
Mounting	Wall mounted
Suitable For	Split and window ACs up to 2 ton, including inverter ACs

Questions

Frequently Asked Questions

Does an inverter AC need a stabilizer?

An inverter AC works over a wider voltage range than a normal AC, but its PCB is still damaged by high voltage and spikes. In areas with poor supply, an AC stabilizer is still worth it. Check your AC’s working range in its manual and choose a stabilizer that covers your site’s voltage.

Why is there a delay before the AC starts?

That is the time delay feature. After a power cut, the gas inside the AC is still under pressure. If the compressor starts immediately, it pulls a very high current and can get damaged. The stabilizer waits until the pressure settles, then switches on the AC.

Can I connect a fridge or TV to the AC stabilizer?

Use it for one AC only. A fridge needs its own small stabilizer, and for several appliances together a single phase servo stabilizer is the right choice.

Why does the stabilizer make a clicking sound?

That is the relay switching to a new tapping when the voltage changes. It is normal. Very frequent clicking means the supply voltage is changing a lot.

Where should I install it?

On the wall near the AC’s power point, indoors, away from water and direct sun, at a height where the display is easy to read.

What if my voltage goes below the working range?

The stabilizer cuts off the AC to protect it, and switches it back on after the time delay once the voltage returns. If this happens often, your area needs a wider-range servo stabilizer.