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Transformers - High Voltage Current Limited


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Information Unlimited has a remaining quantity of high voltage 60 Hz current limited transformers originally intended for large neon signs and other gas displays.

These transformers do not have the recently mandated GFI shut down circuitry and therefore are excellent for SCIENTIFIC APPLICATIONS, TESLA COILS, enclosed JACOB'S LADDERS, DC VOLTAGE MULTIPLIERS, GAS LASERS, PLASMA POWER SOURCES and many other specialty applications.

Transformers are easily parallel connected to double, triple, quadruple, etc., current for high power applications. However parallel connection of these units for increasing current can cause a deadly electrocution hazard. We also supply diodes and capacitors for conversion to DC direct current.

These Transformers may be used for DC applications. However it is not advised unless you are well experienced into handling high-voltage. You can download the data here for circuits and information.  See the PDF schematic here.

Regarding the 60 milliampere transformers:

Parallel connecting these units for increasing
current can cause a deadly electrocution hazard.


High Voltage 115 VAC 50/60Hz Transformers
for Tesla Coils, Capacitor Chargers, etc.
Current limited transformers are excellent for small Tesla coils up to 1 KW using stationary spark gaps. Multiple 115 vac 50/60 hz input units can have both primary and secondary windings connected in parallel for higher currents. Two identical 115 vac 50/60 hz input units can have primary windings connected in series for 220 volt operation.

Current-Limited HV Transformer at 30ma and 6KV

 

6kv 30ma transformer

Note: this is a GFI transformer, but our BTC30 tesla coil is designed to work with this transformer, so the GFI circuitry will not shut down the BTC30 tesla coil when in use, but only if the output is directly touched (which of course should never be intentionally done).

6KV 30ma, centerpoint grounded secondary, current limited, encased unit with screw terminals. This transformer is excellent for small table top Tesla coils and is used in our new and revised BTC3K kit and BTC30 ready-to-use Tesla coils. Dimensions: 10 3/8 x 3 5/8 x 3 1/4" with a weight of 11.4lbs. Shipping weight is approximately 17 pounds and may exceed $25.

- 6kV 30mA non-GFI Transformer ... $69.50

Current-Limited HV Transformers at 60ma and 15KV
15kv 60ma transformer

15kv 60ma transformer 15kv 60ma transformer 9kv 60ma transformer

We have purchased tooling for and now have our own 15000 volt 60 ma current-limited transformers. These are brand new, factory-fresh transformers specially made for Tesla coils (and also work with many other high-voltage applications), and are only available through us. Center-point grounded, they DO NOT contain the bothersome ground fault interrupter (GFI) that makes other transformers difficult to use for Tesla coils and other scientific applications. However, this means they do not comply with the UL 2161 ground fault interrupt necessary for neon sign installations, and it is dangerous and illegal to use these transformers for luminous tubes such as neon lighting. (See our conventional neon transformers for this application.)

These transformers also include a built-in radio frequency filter on each output for use in Tesla Coils and other similar circuitry, and only require a 300-1000 ohm 25 watt resistor, included with purchase, in series with the outputs (initially these resistors were placed in the potting with the RF filter, but we found that they operated a little too warm for our liking, so they are run externally for better heat management). Two of these transformers can be connected in parallel, and if more than 2 are run in parallel for larger coils an external suppression circuit (such as our SUP10) is advised.

These Transformers are excellent for other high-voltage functions as well.

Operates from 115 vac, and up to 6 are easily parallel connected for higher power operation. Six units connected in this way can produce 15000 vac rms at 360 ma. This is enough power to make a large Tesla coil easily producing 10+ foot arcs (such as our BTC70). May also be connected for 7500 volts at 720 ma.

All units are open circuit tested at 1.2 x 120 vac for six hours before shipping. The 15KV/60MA units are 10.75x6.4x5.25" at 42 lbs. (Note that shipping weight is approximately 52 pounds and may exceed our website's estimation -- our shipping department will let you know if it is more, or please contact us by phone or email if you would like to know in advance.)

A secondary protection circuit schematic designed by the late DC Cox of Resonance Research is included and must be used for larger Tesla coil applications of more than 2 transformers, to protect the high voltage secondary from high frequencies, current, and voltage transients. (See the PDF schematic here.)

This protection circuit is also available as a kit, or fully assembled (SUP10).
suppression circuit
SUP10

Contact us for volume purchasing.

Note: these non-GFI transformers are NOT to be used with luminous tubes such as neon lighting. It is dangerous and illegal to do so.

- 15kv 60mA non-GFI Transformer ... $319.95
- optional HV Suppression Circuit, Kit and Plans ... $120.00
- optionalHV Suppression Circuit, Assembled ... $199.50

Pole Transformer
14.4KV Pole Transformer

Heavy duty 14.4kV (very conservatively rated), 1- or 2-bushing oil filled unit, running on 120/240VAC input. Good for Tesla Coils, up to 20 ft. discharges! Great for many other scientific experiments and industrial applications. Sold only to qualified researchers and labs.

DANGEROUS PRODUCT -- CAN CAUSE ELECTROCUTION IF IMPROPERLY HANDLED

A Hazardous Equipment Affidavit must be signed before these items can be released (see link below).

 

- 3 KVA 14.4 KV Pole Mount 120/240 1PH 1 Bush AL Wire ... call for pricing
            ~250lbs, 42"H x 14.5"D (21" w/attachments)
- 5 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~250lbs, 42"H x 14.5"D (21" w/attachments)
- 7.5 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~250lbs, 42"H x 14.5"D (21" w/attachments)
- 10 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~330lbs, 42"H x 14.5"D (21" w/attachments)
- 15 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~460lbs, 34.5"H x 18.5"D (24" w/attachments)
- 25 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~570lbs, 37.5"H x 16.5"D (23" w/attachments)
- 50 KVA 14.4 KV Pole Mount 120/240 1PH 2 Bush AL Wire ... call for pricing
            ~870lbs, 48"H x 25"D (31" w/attachments)
Please contact us for current pricing and availability, or for any other questions on these items.


 

60 mA
 
15,000 Volts at 60 Milliampere Transformers
  Part# Output Input Manufacturer
Price
15 Kv at 60 ma 115 vac 60 Hz INFORMATION UNLIMITED
Click for More Info
About This Product
$319.95
 
5000 Volts at 60 Milliampere Transformers
  Part# Output Input Manufacturer
Price
5 Kv at 60 ma 115 vac 60 Hz MAGTEK 728-0461-004-0
$79.95
5 Kv at 60 ma 115 vac 60 Hz

MAGTEK 721-0461-401-0

limited quantity: 1 item left

$79.95
5 Kv at 60 ma 115 vac 60 Hz ALLANSON 817C
$79.95
 
4000 Volts at 60 Milliampere Transformers
  Part# Output Input Manufacturer
Price
4 Kv at 60 ma 115 vac 60 Hz ALLANSON 1057K11
$69.95

All purchases include our BTC3 Tesla coil plans and a secondary protection circuitry schematic when used for TESLA COILS as suggested by DC COX of RESONANCE RESEARCH.

Regarding the 60 milliampere transformers:

Parallel connecting these units for increasing
current can cause a deadly electrocution hazard.

 

30 mA
 
5000 Volts at 30 Milliampere Transformers
  Part# Output Input Manufacturer
Price
 
5 Kv at 30 ma 115 vac 60 Hz TRANSCO T512PB
$59.95
 
4000 Volts at 30 Milliampere Transformers
  Part# Output Input Manufacturer
Price
 
4 Kv at 30 ma 115 vac 60 Hz MAGTEK 728-0171-006-0
$55.95
4 Kv at 30 ma 115 vac 60 Hz MAGTEK 728-0171-004-0
$55.95
4 Kv at 30 ma 115 vac 60 Hz TRANSCO T412PB
$55.95