Voltage Stabilizer Load bearing capacity

Question

I have two air-cooled voltage stabilizers, both rated for 90–300 VAC input and 15 Ampere output. However, one weighs approximately 5 kg (used for AC) and the other 30 kg bought recently for other appliances.
Both are made by the same company - V-Guard, in India.
The smaller is VS 500 (Stabilizers for AC),
the other is VGMW 500 (Mainline Stabilizers)
as per the company website Voltage stabiliser buying guide.

Both have the same voltage and current specifications,

Should their load-bearing capacity in watts be considered identical?
If yes, what accounts for the significant weight difference.

Actually, I have a peak load of 5 KW when I use multiple appliances, can I use the heavier one.

Ummar Muhammad - Hi, That question has been detected as mostly or completely copied from genAI (ChatGPT, Gemini, Perplexity etc.). At least it isn't asking us to explain some genAI hallucination. However current genAI policy here requires you to disclose when you use genAI and at least an overview of the prompt which was used, so please explain. It would also be helpful to know why you're posting a genAI response. Is this some kind of test? Why not post your own words? What is the context e.g. do you really have those voltage stabilisers or is this a hypothetical situation? TY — SamGibson
– SamGibson ♦, Commented Nov 2 at 2:51
That was careless on my part, I actually wanted to make the query understandable. It's not a hypothetical situation rather I wanted to use the Stabilizer for a cumulative load of 5 KW at my home. — Ummar Muhammad
– Ummar Muhammad, Commented Nov 2 at 13:39
@UmmarMuhammad You remove the obviously AI part and the question seems clear so I have eopene it. HOWEVER, it woul help if you provide brand andmodel andwebsite links if available. || The manufacturer is the best source of information. || It sounds as if the heavy unit has an iron cored inductor while the lighter may be more electronic based. || V = Power/I = 5 kW/15 = 333 V. It seems unlikely that either will suppot 5 kW at lower voltages. — Russell McMahon
– Russell McMahon ♦, Commented Nov 2 at 13:51
Both are manufactured by V-Guard in India. The smaller is VS 500 (Stabilizers for AC), the other is VGMW 500(Mainline Stabilizers) as per the company website @ vguard.in/pdf/V-Guard-Voltage-Stabilizer-Buying-Guide.pdf . — Ummar Muhammad
– Ummar Muhammad, Commented Nov 4 at 1:58

Russell McMahon · Accepted Answer · 2025-11-04 11:56:59Z

I have added links in your question to the company's buying guide and to the description pages for the two products concerned.

The descriptions are not full datasheets.
Most of the documents do not indicate that they are true stabilisers, but this does - Buying guide for voltage stabilisers

The stabilizers get this done by using an electronic circuitry, which changes the required taps of an inbuilt auto transformer with the help of high quality electromagnetic relays to generate the desirable voltage. If the Voltage to be supplied is not within the range, a mechanism switches the required transformer tap, thereby bringing the Voltage supply within a safe range.

This suggests that the heavy init uses a physical iron cored transformer and that the light unit may use a high frequency inverter to achieve similar functionality. This is not certain.

They appear to disconnect mains outputs when inputs vary too widely and to have timers to allow eg orderly restart of compressor motors.

The sales brochure here adds pretty pictures but not much technical detail.

It is not obvious what either product actually does and which is better suited to your task - the manufacturer can provide more detail.

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