Variable transformer 500VA from PHC Enterprise, Inc., with adjustable 0–130VAC benchtop model SC-5M, showing control dial and terminals.

Diagram of PHC Enterprise SC-5M variable transformer showing specifications for 500VA, 0–130VAC benchtop adjustable power supply

Variable Transformer 500VA (5 Amp) | 0–130VAC Benchtop - SC-5M

Name: Variable Transformer 500VA (5 Amp) | 0–130VAC Benchtop - SC-5M
Brand: PHC Enterprise, Inc.
SKU: SC-5M
Price: 59.0 USD
Availability: InStock
Rating: 4.7 (33 reviews)

by PHC Enterprise, Inc.

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$72.00

$72.00 - $72.00

$72.00

$59.00

$59.00 - $59.00

$59.00

500VA Variable Autotransformer (5 Amp) | Part SC-5M

The SC-5M is a precision-engineered 500VA variable autotransformer (variac) designed for adjustable AC voltage control on standard 120V bench, lab, and repair-shop circuits. Delivering a smooth, continuously adjustable output from 0 to 130VAC at up to 5 Amps, the SC-5M is a compact benchtop tool for technicians, educators, and product developers.

Why Choose the SC-5M?

Compact Benchtop Footprint: Sized for technician workstations, repair benches, and school lab carts where a full-size 1500VA unit isn't needed.
Real-Time Analog Monitoring: Integrated analog voltmeter gives a quick visual reference as you dial in your target AC voltage.
Rugged & Fuse-Protected: Heavy-duty industrial-grade metal enclosure with a replaceable built-in fuse for overload protection.

Technical Specifications

Type: Single-Phase Non-Isolated Variable Autotransformer (Variac)
Part Number: SC-5M
Input Voltage: 117V AC @ 50/60Hz (Standard US Wall Outlet)
Output Voltage: 0–130V AC (Variable)
Rated Capacity: 500VA (5 Amp Max Continuous Load)
Display: Integrated Analog Voltmeter
Protection: Built-in Fuse (Replaceable)
Weight: 9.5 lbs

Safety & Application Note:
The SC-5M is an autotransformer and does not provide galvanic isolation from the incoming AC line. For vintage tube audio, hot-chassis repair, or floating signal applications, explore our isolated variac models.

Common Applications — Who Is This For?

University & Research Labs: Ideal for engineering education and physics experiments requiring adjustable AC voltage.
Electronics Repair & Service: Power up vintage equipment or test circuits under variable load.
Testing & Calibration: Useful for QC departments verifying power supply tolerances across an AC voltage range.
Product Development: Simulate real-world AC line fluctuations for new device testing up to 5 Amps.

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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