What we buy
Ranges we buy on this page
A control transformer is a small dry-type unit that provides control voltage inside a panel or a machine. This page covers the units Transformer Buyers NC buys, the markings needed for inspection, and practical handling for removal.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 1-phase | 0.05 - 5 kVA | 600 V | Dry-type |
Who we buy from
Six kinds of seller
- Recyclers
- Electrical contractors
- Equipment dealers
- End users
- Demo contractors
- Distributors
Fast offers
A written offer the same business day, based on your photographs.
Dedicated logistics
Our own crew, trailer and crane, not a brokered haul.
No broker fees
One buyer from first call to cleared pad, with nothing skimmed.
How it works
Six steps from photograph to payment
- 01
Take pictures
Photograph the nameplate, the inside of the cabinet and the tank from both ends. Four frames on a phone are enough to price most units.
- 02
Send them to us
Email or text the photographs with the site address and whether the unit is still energised. We reply the same business day with questions or a number.
- 03
Review the offer
The offer names the unit, the site, the price and the pickup window. It is written, dated and good for thirty days unless the unit changes hands.
- 04
We schedule freight
A crew, a trailer and a crane if the pad needs one. You get the date and the arrival window, and the site does not have to close for it.
- 05
Testing on arrival
Winding resistance, insulation resistance and a turns ratio check, plus oil analysis where the unit is liquid-filled. Results travel with the unit.
- 06
Get paid
Payment is released against the signed bill of sale and the scale ticket, by check or ACH, with the paperwork copy left on site.
What we handle
The parts sellers dread
Rigging
Crane, skates and a route survey for anything that will not roll onto a trailer.
Oil containment
Pans, absorbent and a spill plan before a drain plug is touched.
Bill of sale
A document that clears a lien, a lease or a bankruptcy file, not a handwritten note.
PCB paperwork
Testing and manifesting for pre-1979 oil, handled before the unit moves.
On the ground
Control Transformers explained
A control transformer separates the machine's control circuit from its incoming power circuit and establishes the required control voltage. A common arrangement takes a 480-volt primary connection and produces a 120-volt secondary.
Other combinations exist, so terminal markings and the wiring diagram matter more than the cabinet's incoming voltage alone.
The VA rating describes the transformer's apparent-power capacity, not the horsepower of the machine containing it. Contactors and solenoids can draw substantial current during pickup.
A unit selected for that momentary demand may be larger than its steady control load suggests, especially in a machine with several coils operating together.
Local reality
The North Carolina install base
Control transformers appear throughout North Carolina's industrial panels and machine tools, from machining cells around Charlotte to textile equipment in the Piedmont. Look behind a cabinet door for a laminated core, exposed terminal screws, and a mounting foot or bracket.
Some units sit beneath a separate primary fuse block assembly.
Panel replacement projects can produce groups of similar units, while machine dismantling often produces mixed VA ratings and voltage combinations. A maintenance crew in Greensboro may remove several from retired production equipment during one shutdown.
Keeping each nameplate with its unit prevents a pallet of recognizable equipment from becoming unidentified parts.
Around the site
The inspection that decides value
Inspection starts with the VA rating, primary voltage, secondary voltage, and fuse arrangement. Photograph the nameplate straight on, then capture the terminal diagram and installed jumpers.
Dual-voltage primaries may use series or parallel connections; a photograph of those connections helps distinguish the actual setup from the options printed on the label.
Physical checks focus on cracked terminal insulation, burned winding varnish, loose laminations, and damaged mounting feet. Record whether the unit failed during operation or was removed from a working machine.
A technician's resistance readings or insulation-test report can help, but test voltage and disconnected circuit details should accompany any submitted results.
Where it sits
Fluid condition and PCB status
These control transformers are dry-type units, so there is no insulating-oil sample to collect and no tank to drain. Their condition depends on the winding insulation, terminals, and core assembly.
Oil found on a unit may have come from nearby machine lubrication or hydraulic equipment rather than from the transformer itself.
Do not assign PCB status solely from a manufacturing date or a stain on the winding. For an ordinary dry-type control transformer, the oil-filled-equipment sampling process does not apply.
If a cabinet has known contamination or uncertain residues, retain the site records and identify that issue before packing the removed units.
On the ground
Getting it off the pad
Unlike a yard transformer, a control transformer usually comes off a cabinet backplate rather than a concrete pad. Qualified personnel should isolate all feeds, verify absence of voltage, and disconnect the primary and secondary conductors.
Support the core assembly while removing its mounting bolts so it cannot fall onto adjacent terminals.
Individual units are light enough to ship by parcel, with packaging selected for the actual weight and exposed terminals. They are usually sold by the pallet when a plant clears several panels or machines.
Use dividers and blocking so steel cores cannot strike neighboring windings, fuse holders, or terminal insulating barriers.
Local reality
What a buyer weighs up
Transformer Buyers NC buys used, surplus, failed, and obsolete control transformers anywhere in North Carolina. Assessment considers readable identification, VA capacity, voltage combinations, and physical condition.
Matching units from a documented machine line are easier to assess than a mixed pallet with missing labels, cut terminals, and no record of removal.
The fuse arrangement deserves its own photograph because holders may be attached to the transformer or mounted elsewhere in the panel. Identify primary protection and any secondary protection without assuming both are present.
Include manufacturer and model markings, along with notes about missing fuse clips, terminal covers, brackets, or connecting links.
Around the site
The next step for a control
Prepare a count by VA rating and primary-to-secondary voltage combination before discussing removal. For example, separate 480-to-120-volt units from 240-to-24-volt units rather than describing everything as control equipment.
Include clear photographs of the nameplates, terminals, fuse arrangements, and the full group, plus the North Carolina location where removal will occur.
State whether the transformers remain wired inside machines, sit loose in a maintenance room, or are already secured on a pallet. Parcel shipment and pallet pickup require different packaging and access details.
Note loading-dock access, forklift support, and any shutdown restrictions so handling can be planned around the actual cabinet-removal work.
Get started
Get an offer in minutes
Five fields is all it takes. Photographs help, but a nameplate and a town are enough to start.
No fee, no obligation. We reply the same business day.
Tell us what you have
We reply the same business day.
Questions
Straight answers
Equipment types
Which markings identify a control transformer correctly?
Start with the VA rating, primary and secondary voltages, manufacturer, and model number. Photograph the wiring diagram and terminal jumpers as well. A cabinet labeled 480 volts does not establish the transformer's secondary voltage or show how a dual-voltage primary was connected.
Service area
Can failed control transformers be included with working units?
Yes. Transformer Buyers NC buys failed control transformers as well as units removed from working equipment. Keep failed units identified separately and describe burned windings, damaged terminals, or reported fuse operation. Attach any maintenance report rather than treating an untested unit as operational.
Payment
Should control transformers go by parcel or pallet?
Individual control transformers are generally light enough for parcel shipment, while groups are usually handled by the pallet. Protect exposed terminals and keep heavy cores from moving inside the packaging. Provide the unit count, packaged weight, and loading access before arranging transportation.
Logistics
Getting it off the pad: what should a seller know?
Unlike a yard transformer, a control transformer usually comes off a cabinet backplate rather than a concrete pad. Qualified personnel should isolate all feeds, verify absence of voltage, and disconnect the primary and secondary conductors.