Voltage Regulator

Voltage Regulator Price in Pakistan 2026 — Complete Buyer's Guide

A voltage regulator is any device that maintains a stable output voltage despite changes in input voltage or load current. The term covers a wide range of products — from tiny IC chips on a PCB to wardrobe-sized industrial stabilizers for CNC machine tools. This guide explains the three main types of voltage regulators, when each is the right choice for Pakistani users, and what CNC Electric stocks for industrial and laboratory use.

CNC's primary voltage regulator product is the TDGC2 / TSGC2 series variable AC voltage regulator (manual variac), priced from Rs. 50,000 for a 5 kVA single-phase unit. For home and shop voltage stabilization on normal WAPDA supply, our voltage protector range (Rs. 1,750 – 9,700) is typically the better answer.

What Is a Voltage Regulator?

A voltage regulator is an electrical or electronic device that produces a stable output voltage from a variable input. The function is simple — keep output constant whether input rises, falls, or the load draws more or less current. The implementation varies hugely depending on the application:

• Tiny PCB chips (e.g. 7805, 7812, LM317): a few rupees each, deliver 5 V or 12 V at small currents for hobby electronics and embedded boards.
• Mains AC stabilizers (AVR): Rs. 8,000 – 250,000+, deliver stable 220 V to homes, shops or factories from wildly varying WAPDA voltage.
• Industrial variable autotransformers (variac): Rs. 50,000 – 240,000, give the operator manual control over output voltage for testing, calibration, or precision CNC supply.
• Switching regulators (SMPS): built inside almost every modern power supply, laptop charger, and LED driver.

Knowing which type you actually need is more than half the battle. The rest of this guide walks you through it.

The Three Types of Voltage Regulators

Each of these three families has many subtypes — but for any practical buying decision in Pakistan, you can place your need in one of these three boxes first.

Automatic Voltage Regulator (AVR) — Static vs Servo Motor

For mains-AC home and commercial use, the term Automatic Voltage Regulator (AVR) usually means one of two designs:

Most Pakistani home stabilizers (Servo Star, Stabilex, Sollatek, MultiPower) are static / relay-tap designs at the lower price point. Hospital-grade and CNC-machine-grade units are servo motor designs at the higher price.

Function of a Voltage Regulator

The voltage regulator has one job: output a constant voltage regardless of what input voltage or load conditions throw at it. In practice, this means:

• Compensating for low voltage (under-voltage): WAPDA delivers 170 V instead of 220 V at peak demand. The regulator boosts the output back to 220 V using transformer taps or a variac.
• Compensating for high voltage (over-voltage): WAPDA spikes to 260 V after load-shedding ends. The regulator trims output back to 220 V.
• Holding voltage steady under load changes: When a 3 kW AC compressor kicks in, the regulator prevents the inrush from sagging the voltage to nearby sensitive equipment.
• Protecting downstream equipment: ICs, motor windings, and transformer cores all have voltage tolerance bands. Operating outside those bands shortens life.

Note what a voltage regulator does not do: it does not disconnect on dangerous voltage (that is a voltage protector's job). It does not handle nanosecond surges (that is an SPD's job). It does not back up power during outages (that is a UPS / inverter's job). Pick the right device for the right threat.

CNC TDGC2 / TSGC2 Variable AC Voltage Regulator — Industrial & Laboratory

CNC stocks the TDGC2 (single-phase) and TSGC2 (three-phase) series variable autotransformers — manual variac-style voltage regulators where the operator adjusts output voltage with a rotary knob from 0 V to 250 V (single-phase) or 0 V to 430 V (three-phase line-to-line).

Built for: CNC machine tools, lab calibration benches, motor test rigs, controlled-voltage manufacturing, scientific instruments, transformer test sets, elevator commissioning, and any application where the user needs to dial in a specific voltage for testing or precision operation. View TDGC2-5000VA →

Built-in protections: over-voltage, over-current, and phase sequence protection on three-phase units. No waveform distortion (pure sine output). 5-year warranty.

For Home & Shop Use — Voltage Protector Is Usually the Better Answer

Most Pakistani homes don't actually need a voltage regulator — they need a voltage protector. Here's the difference:

• A voltage regulator corrects bad voltage by transforming it back to 220 V. Useful if your area sees prolonged under-voltage (below 180 V for hours daily).
• A voltage protector disconnects on bad voltage and reconnects when safe. Cheaper, no running cost, no maintenance.

If your WAPDA supply mostly stays in the 180-260 V range with occasional spikes, a voltage protector (Rs. 1,750 – 9,700) is the right answer. If you genuinely have sustained low-voltage (less than 180 V for 4+ hours per day), then you need a stabilizer / AVR — and you should buy one of the local-brand units (Servo Star, Stabilex, Sollatek) that we don't stock. See our complete Voltage Protector vs Stabilizer guide for the decision framework.

For Electronics & Hobby Use — Linear IC Regulators (7805, 7812, LM317)

If you searched for "voltage regulator" because you're building a Raspberry Pi project, an Arduino sensor board, or a small power supply, you are looking for a linear IC voltage regulator — a tiny chip costing Rs. 20-200 that delivers a fixed DC output. Common parts:

• 7805: fixed 5 V output, up to 1 A. The standard MCU / sensor regulator.
• 7812: fixed 12 V output, up to 1 A. Common for relay boards and small motors.
• 7809: fixed 9 V output, up to 1 A.
• LM317: adjustable 1.25 V to 37 V output via two resistors. The general-purpose lab regulator.
• LM7805 / LM7812: National Semi (now TI) versions of the 7805 / 7812. Functionally identical.
• Zener diode as voltage regulator: simplest possible regulator — a Zener diode plus a series resistor. Used for low-current reference voltages.

CNC does not stock these IC chips. For electronics components, source from Electronation, RasTeck, or local Saddar Bazaar electronics suppliers (Karachi) / Hall Road (Lahore). For the AC-mains voltage regulators that CNC does stock, see the TDGC2 series above.

CNC vs Servo Star vs Stabilex vs Sollatek — Voltage Regulator Brand Comparison

CNC and the European brands occupy the variable-variac and industrial-AVR niche. For home and shop stabilizers, local Pakistani brands offer better value — and a voltage protector often eliminates the need entirely.

Sizing Your Voltage Regulator

Match the kVA rating to your peak load, not your average load. For a 1.5-ton AC inverter unit (which is roughly 1.8 kW running, 3 kW startup), use at least a 5 kVA regulator. For a small workshop with one CNC mill plus auxiliary lighting (8-12 kW total), step up to 15 kVA. Industrial users typically size at 1.5× their nominal load to handle motor inrush.

Bulk & Industrial Pricing

CNC TDGC2 and TSGC2 variable voltage regulators are imported on order with 7-10 day lead time from Lahore. Bulk pricing for educational / lab fitouts, factory commissioning, and switchgear assembler quantities available. Custom-rated units (50 kVA+, special tap voltages, isolation transformer combinations) on consultation. WhatsApp +92 326 1111376 with your application requirement.