Magnelab offers a large array of products for power monitoring. They offer several styles of AC current sensor or DC current sensor including models that feature a Rogowski coil, split-core and solid core design. Magnelab has a current sensor to suit almost any need.
Founded in Boulder, CO, in 1968 by Carl Forsberg, our company first started as ‘Magnetek’. We then manufactured simple products like antenna coils, but quickly expanded into more complex products, including military switching components. Our company was taken over by the Solomon Corporation in 1995. Soloman was a leading developer for the electrical industries and utilities, creating regulators, enclosers and transformers. When Magnelab was purchased by them, we moved to our Longmont, CO, facility, just north of the city of Denver. Currently, we are owned by Miami, FL based company Manutech. They have been in the field of designing and manufacturing magnetics components for nearly half a century and some 350 people are proud to be employed by them in their offshore facility.Today we create products that service the energy monitoring industry by delivering a number of products, including our precision current transformers. This line of products includes the Rogowski flexible CT options, the split core current sensors (opening type), the toroidal current sensors (non-opening type) and various precision potential transformers.
Our goal is to offer the highest quality products as quickly as possible for our customers, regardless of the volume of their order and we always make sure our pricing is highly competitive. Because we work together with an offshore company, we have very low carbon costs. In fact, these are the lowest in all of the Western hemisphere. As a result, no other supplier is truly able to compete with our prices.
Our company is fully ISO 9001:2008 certified. This proves the quality of our products and the fact that we are committed to improvement. All our products, from our electrical transformer to our flyback transformer and from our step down transformer to our control transformer, all meet those same ISO certifications.
Our manufacturing and engineering organization is fully staffed. This allows us to come up with innovative designs, such as our isolation transformer and our 24v transformer. We can also build from print, or design completely new devices as per specifications. This is, for instance, how we developed our low voltage transformer and our high voltage transformer, which have both proven to be very popular. Our goal is to build a long lasting professional relationship with our customers, which means that if they have specific needs they want to apply to a standard power transformer or to the RCT-350T flexible AC current sensor, for instance, we will do our best to achieve that.
We offer a huge selection of current sensors, current transformers, flexible core coils (Rogowski), split-core current transformers and more. Whatever you need to get the job done right, we have what you require and will always go that extra mile. Show Less
At Magnelab, you are able to find a huge selection of current transformers, current sensors, split core current transformers and flexible core coils (Rogowski coils). In fact, the Magnelab flexible current transformer is one of the highest rated by customers on the market, which is a true testament to how good our products are. We want to make sure you can get the job done properly.
Our flexible/rope CT uses a Rogowski coil. This system was named after Walter Rogowski, who developed the electrical device that allowed AC (alternating current) to be measured, as well as high speed current pulses. It is made up of a helical coil of wire and the lead on one end of the wire returns through the center of the coil to the other end. This means that both terminals are always at the same side of the coil. This entire coil of wire is then wrapped around the conductor carrying the current that needs to be measured – this is usually a straight electrical conductor. No iron or other metal core is involved in this construction. What is critical, however, is the diameter of the coil, the winding density and the rigidity of the winding. Put together, they help to preserve immunity to the various external fields, while also ensuring that it is not too sensitive to the way the measured conductor is positioned.
The voltage that the coil induces is in exact proportion to the derivative (rate of change) of the current found in the straight conductor. Hence, the Rogowski coil’s output is generally connected to a type of integrated circuit, so that the output signal is in proportion to the current itself. This is precisely what our flexible/rope CT can offer, particularly when used together with a current sensor.
There are a number of clear advantages to using this type of system. Because it isn’t a closed loop, as the two terminals are connected, the coil is flexible and open ended, which means it will not disturb a live conductor while it is wrapped around it. Of course, it is very important to position it properly. Like with the ACT-0036 current transformer, the accuracy can change dramatically if not positioned properly. This is why it is best to use a precise locking system.
The flexible/rope CT also has low inductance. As a result, if currents change very rapidly, it can still respond to it correctly. In fact, the speed can often be as low as just a few nanoseconds. There is no iron within the flexible rope, which means that, even under large currents, it is highly linear. This can be used in welding, electric power transmission, pulsed power and more. Additionally, only very small reference currents are needed for calibration.
There are a number of other benefits. The construction cost is generally reduced, for instance, and there is no risk of the secondary winding opening. It is also easy to compensate for the temperature. Finally, there is no need for an increase in secondary turns to keep a constant current output. Hence, a smaller coil is needed than would be used in a current transformer.