Variable transformer SC-3M by PHC Enterprise, Inc., 300VA, 3 Amp benchtop variac with adjustable 0-130VAC output.

Variable transformer SC-3M by PHC Enterprise, Inc., 300VA, 3A benchtop variac with adjustable 0–130VAC output.

Diagram of PHC Enterprise 300VA Variable Transformer (SC-3M) showing specifications and electrical connections for benchtop use.

Variable Transformer 300VA (3 Amp) | 0–130VAC Benchtop Variac - SC-3M

Name: Variable Transformer 300VA (3 Amp) | 0–130VAC Benchtop Variac - SC-3M
Brand: PHC Enterprise, Inc.
SKU: SC-3M
Price: 49.0 USD
Availability: InStock
Rating: 4.7 (33 reviews)

by PHC Enterprise, Inc.

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$59.00

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$59.00

$49.00

$49.00 - $49.00

$49.00

Variable Transformer 300VA (3 Amp) | 0–130VAC Output - SC-3M

Product Overview: The SC-3M is a compact, precision-engineered 300VA variable AC transformer designed for smooth, continuous voltage control. Delivering a clean, adjustable 0–130VAC output, this portable benchtop variac is an essential voltage regulation tool for hobbyists, technicians, university labs, and repair facilities.

Technical Specifications:

Part Number: SC-3M
Input Voltage: 117V AC @ 50/60Hz
Output Voltage: 0–130V AC
Rated Capacity: 300VA (0.3 kVA)
Max Current: 3 Amps
Display: Integrated Analog Voltmeter
Protection: Replaceable Built-in Fuse
Weight: 7 lbs

Important Note on Electrical Isolation:
This unit is an autotransformer, not an isolation transformer. The output voltage is not electrically isolated from the AC line input. Use only with equipment that does not require isolated power and ensure proper grounding.

Industrial & Lab Applications:

University & Research Labs: Engineering coursework, physics experiments, and prototype testing.
Electronics Repair & Service: Safely bring up vintage electronics, test transformers, and diagnose low-power AC equipment.
Quality Control & Testing: Simulate real-world AC voltage fluctuations for small appliances up to 3 Amps.

Key Features:

Rugged industrial-grade steel enclosure built for benchtop durability.
Smooth-rotation control knob for fine voltage increments.
Standard grounded 3-prong AC output receptacle.
High-purity copper windings for low loss and reliable output power.

ac transformer

Very nice product I would certainly buy another if needed

What an INCREDIBLE deal, what service!!! I'm be buying more!

I bought the Variac/isolation transformer combo. FOR STARTERS: NOBODY ELSE MAKES THIS COMBO with a genuine isolation transformer. And that fact that it's $200 out the door is insanity. My only advice with the unit would be to double check the voltage display against a multimeter; I find my display to be about 5V lower than the actual output and adjusted accordingly.

This item was packaged more securely than a nuclear warhead. Seriously, the packing job is a masterclass in transportation and logistical safeguards.

In short--I rarely leave reviews. I felt I HAD to for this product. If you're not sure because it's a newer item/company, don't worry. They are LEGIT and they are INCREDIBLE.
One more side note--customer service response is insanely fast also. I emailed a question on a SUNDAY EVENING and got an answer.

GREAT, domestically-owned small business I will support again.

Dan-Owner, HiFi Hopes LLC

Great product

I have not used it yet but it seems to a very quality design and construction.

Variable Transformer 20 amp

The transformer worked great for our project so we bought another for the lab. The meter and dial are off a little. Make sure to verify with volt meter.

Voltage Control

Use this to lower the operating voltage of vintage guitar amplifiers they are designed to run between 115-117AC not 120-125VAC great product!

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