Osborne’s Current Transformers

Osborne Transformer is a market leader in the design and production of premium quality current transformers. If your facility requires extremely durable current transformers, you’ve come to the right place. Osborne’s current transformers offer unmatched performance and longevity.

World Class Components

Osborne brings you over 80 years of the finest in hand-crafted, small batch produced transformers and inductors. Are small batch transformers right for you?

You invest great effort and hard work into your circuits. Don’t undermine your standards by choosing cut-rate commodity transformers.

Commodity Transformer Osborne Transformer
application generic application specific
cheap materials premium materials
hasty assembly meticulous details
liberal quality control rigorous testing standards
automated mass production hand-crafted batch production
10-15 year lifespan 50+ year lifespan

Overview of Current Transformers

The Institute of Electrical and Electronic Engineers defines a current transformer (IEEE Std C57.13) as “a transformer intended to reproduce in its secondary circuit, in a definite and known proportion, the current of its primary circuit with the phase relations substantially preserved”. Its primary winding is connected in series with the conductor carrying the current to be measured or to be controlled and its secondary winding is connected to the measuring, protection or control devices. Osborne’s designs and manufactures current transformers which are used for instrumentation applications, others which are used for power system synchronizing applications and others which are used in protection circuit application. They have been designed to meet specified current ratios, burden impedance and transformation errors.

Let’s talk about your project. Contact Osborne now:


Durable Transformers Deliver Peace of Mind

13267lOsborne’s emphasis on reliable design engineering means that your circuit will have one less potential source of failure. Don’t take unnecessary chances with low cost commodity parts.

Do you want your customer to worry about how or when their current transformers will fail? Of course you don’t, because when current transformers fail, it’s can be dangerous!

By choosing to work with Osborne’s extremely durable designs, you proceed with the utmost confidence in your circuit’s quality and longevity. This sense of security will free you and your team to focus on the things you do best.





Current Transformers Design Options Table

Spec Range Available
Input Voltages: 0 – 600 Volts
Output Voltages: 0 – 600 Volts
Thermal Voltampere Ratings: 0.250 – 5,000 Voltamperes
Compensated Voltamp Rating: 0.250 – 5,000 Voltamperes
Burden Power Factor: 0 – 100% Lagging or Leading
Frequency: 20 – 100,000 Hertz
Phase: Single – Multiple
Electrostatic Shielding: Single – Multiple Shields
Terminals: Wire Leads – Finger Safe
Enclosures: Open Core & Coil – Hazardous Environment
Agency Approvals: UL, CSA, CE and/or TUV

Osborne’s Partners Understand Premium Transformers

Discover why Osborne is the electromagnetic design partner of choice for some of the world’s foremost engineering departments. Osborne’s partners include NASA, DTE Energy, Ford Motor Company, Intel, and many other industrial technology trendsetters.

Osborne Will Help You Define Your Specs

Be confident that Osborne’s unrivaled current transformers will be a great fit for your project. Contact Osborne’s engineers today and let them quickly prepare a preliminary design proposal — FREE OF CHARGE. You can trust Osborne’s no-nonsense approach. Specifying the ideal current transformers will not be a complicated experience.

Related Current Transformers Links

To learn more about Osborne Transformer, please visit the about us page. For more general information, consider visiting Wikipedia.

Application Specific Transformer Designs

You recall the fit of your first finely tailored suit? Your high performing circuits demand that very same attention to detail. Osborne’s craftsmen are here to help.

To get Osborne’s perspective on your project, call or email: