Sell your Siemens JFR voltage regulator.
Single-phase, 32-step (+/-10%, 5/8% per step) step voltage regulator, oil-filled; padmount version also built. Also sold as Siemens Energy JFR, Allis-Chalmers JFR regulator, Siemens JFR padmount regulator. New surplus, used, or failed. Send the nameplate, get a written offer.
Get an offerWhat it is
Read the tank nameplate for type JFR, kVA, voltage, amps, BIL and serial number. Photograph the nameplate, the control panel (the MJ model is printed on it), and the polarized disconnect switch between the control and the tank. Older units may carry an Allis-Chalmers nameplate.
| Type | Single-phase, 32-step (+/-10%, 5/8% per step) step voltage regulator, oil-filled; padmount version also built |
|---|---|
| Manufacturer | Siemens, Siemens Energy JFR, Allis-Chalmers JFR regulator, Siemens JFR padmount regulator |
| On the nameplate | JFR |
| Years | Siemens Energy states the type JFR has been an industry leader since 1936 |
| Voltage classes | 2.5 kV, 7.6 kV, 14.4 kV and 19.9 kV catalog classes (2,500 V through 19,920 V) |
| kVA | 72 kVA through 1,110 kVA in the current Siemens Energy table |
| Line current | 50 A through 1,665 A |
| BIL | 60 kV (2.5 kV class), 95 kV (7.6 kV class), 150 kV (14.4 and 19.9 kV classes) |
| Cooling | Self-cooled, with forced-air ratings on the largest sizes |
| Controls | MJ series panels (MJ-2 through MJ-4A and later), adaptable to other makers' controls |
| Bonus capacity | 65 C insulation lets a 55 C rise unit carry up to 12% over nameplate |
How to read a Siemens JFR voltage regulator catalog number.
Current Siemens Energy JFR catalog numbers read as cooling code, voltage class, then kVA. The first two digits are 10 for self-cooled or 11 for forced-air cooled. The middle group is the voltage class in kV (02.5, 07.6, 14.4 or 19.9). The last group is the kVA rating. Older nameplates may not follow this exact format.
Not sure? Type it into the catalog lookup or text a photo of the label.
- kVA and voltage class are the main value drivers.
- Units with an MJ-4A or later control panel are worth more than units with MJ-2 or MJ-3 series panels.
- Complete units with control, control cable and polarized disconnect switch are worth more than bare tanks.
- Failed units are bought for core and coil content.
- Units built before 1980 may contain PCBs; we sample before an offer is final.
- We do not publish prices. Metal, demand, and condition move them. You get a written number for your unit.
Siemens regulators use a polarized disconnect switch (PDS) between the tank and the control panel. Pulling it removes control voltage and automatically shorts the current transformer, so a JFR control can be swapped with the regulator energized. Siemens states its current panels are directly interchangeable with all JFR regulators built since 1958. A cover-mounted terminal block lets crews change tap connections without going under oil. Siemens credits its partner Allis-Chalmers with pioneering step voltage regulators in the 1930s, and Allis-Chalmers JFR units still turn up in surplus lots.
Three photos price most Siemens JFR voltage regulator offers.
The nameplate
Straight on and readable. Voltage, ratings, model, and serial in frame.
Inside
Doors open: bus, devices, controls, and anything burned or missing.
The whole unit
A wide shot plus what is around it, so we can plan the pick.
The nameplate is on the tank wall. Photograph it straight on with the voltage, kVA, load current, and serial in frame, then photograph the control nameplate and display.
- 01Send the nameplate
Photos or a list with counts. Text, email, or the form.
- 02We read it and reply
During business hours, by whatever contact method you picked.
- 03You get a written offer
Per unit or per lot. A range if we need to sample or test, firm after. Freight is in the number.
- 04We pick up and pay
Our truck and our rigging. Wire or ACH within 3 business days of a passed inspection.
Freight: Single-phase regulators commonly run from roughly 1,000 to over 4,000 pounds depending on rating. They ride flatbeds and lift from the lifting lugs. We plan it.
Selling a Siemens JFR voltage regulator: what people ask.
Yes. Allis-Chalmers and Siemens JFR regulators of any age are in scope. Send nameplate photos.
Yes. We buy padmount and overhead JFR regulators, new surplus or used.
No. Retrofitted controls are common. Tell us what control is installed and we quote the unit as it sits.
Both. New surplus, used, untested, and failed all sell. Condition sets the number, not whether we buy.
Oil-filled units built before 1980 may contain PCBs. We sample before an offer is final and handle the paperwork. We do not give disposal guidance on the web.