Kreatronix has been a trusted distributor for Eaton (earlier known as Cooper Bussmann) since the year 1988. Eaton is an industry leader in critical circuit protection fuses and plays a major role in industrial or commercial facilities.
How Fuses Work
As an over-current protective device, the fuse acts as an “electricity’s safety valve” by providing a weak link in the circuit patch that, when properly applied, will melt and open the circuit to minimize or eliminate any damage that can be caused by an excessive flow of current. There are many fuse varieties and constructions, each developed to address an application’s need for a particular kind of over-current protection.
Over-current Protection
An over-current is either an overload or fault/short-circuit. The overload current is excessive but still confined to the normal circuit paths provided by the conductors, components, and Loads. A fault (often referred to as a short circuit) flows outside the normal circuit paths.
Overloads
Overloads are more often up to 6 times the normal current level. They are usually caused by harmless, temporary in-rush currents that occur when a motor starts up or transformers are energized. Such overloads, or transients, are normal occurrences, and their brief duration is not harmful to circuit components as the associated temperature rise is minimal with no harmful effect.
Its important OCPDs are properly sized and have the appropriate operating characteristics so they do not react to these temporary overloads or cause “nuisance openings”. Due to the overloads’ inherent low magnitude nature, removing them within seconds or even minutes will generally prevent thermal damage.
Fault
Fault, also referred to as short circuits, differ from overload as they can be hundreds to thousands of times greater than the normal operating current. A high-level short-circuit may be up to 30 KA or 200 KA and must be interrupted as quickly as possible to minimize the damage that can include.
The fuse is a highly efficient (OCPD) over-current protective device with a simple design based upon basic principles of physics to interrupt and limit over-current events. Insight into their construction helps in understanding their application. Fuse has four parts common to most designs: case /housings (tube or cartridge), terminals (end blades or ferrules), fuse link (element), and arc-quenching filler. These are different fuse types that provide the operating characteristics required to address differing circuit protection and application.
Fuse is an electronic safety device consisting of a strip of wire that melts and breaks an electric circuit upon exceeding the currents safety level
Bussmann series fuses play a major role in industrial or commercial facilities by providing reliable, maximum protection to power systems. From their physical size or to rejection features they help prevent replacing a fuse with one from another fuse category. This allows correct replacement of fuse is always installed and the voltage, interrupting ratings remain constant.
We deal with HRC, SEMICONDUCTOR and MV fuses, and Accessories. Mainly used for feeder and system protection.
HRC fuse or high rupturing capacity fuse
In that type of fuse, the fuse wire or element can carry a short circuit of a heavy current for a known time period. During this time if the fault gets removed, then it does not blow off. Otherwise, it blows off or melts
Semiconductor fuses
semiconductor fuses are designed for modern-day sensitive power electronics devices that require superior protection against overcurrent. They offer extreme current limiting protection, balanced performance for longevity, and are available in direct bus-bar mount flush-end, cylindrical, and blade designs to meet the needs of a global market.
The semiconductor fuses are used in inverters, rectifiers, electric vehicle battery management systems, locomotive traction drives, industrial motor drives, factory automation systems, air conditioners, telecom devices, battery chargers, and many more. To protect these very sensitive power semiconductor devices from an overcurrent fault, an extremely fast-acting and low-energy let-through circuit protection device is needed. The only device available in the world to protect these sensitive devices are semiconductor fuses.
Medium Voltage Fuses
Introduction to Medium Voltage Fuse Link Technology.
Offering unparalleled short-circuit interruption capabilities, Medium Voltage (MV) current-limiting fuse-links are the principle protection device used by electrical utilities and switchgear manufacturers throughout the world. Safe, reliable, environmentally friendly and cost-effective, MV fuse-links are the protection device of choice for distribution circuits due to their speed of operation and current limiting ability in the event of a short-circuit fault.
Eaton is the world-leading supplier of Bussmann series medium voltage fuses.
Standards ANSI, BS, DIN, IEC, UL, and Medium-voltage fuses generally fit into two categories
Expulsion fuses and current limiting.
Used in Motor and transformer protection application
British Standard Type Range of Fuses
for use in Air
Air (Bus Duct /Distribution/Capacitors)
Air (Bus Duct /Distribution)
For use in Oil
For use in PT / VT & Auxiliary Transformer
British Standard Type Range of Fuses for use in Motor Circuits
For use in MV Motor Circuits
Photovoltaic fuses, holders, and blocks (Solar application fuses up to 1500V DC)
The unique nature of PV system power generation necessitates the need for new and effective electrical protection products for over-current events.
We offer the industry’s most complete and reliable selection of circuit protection solutions for PV balance of system
Low voltage branch circuit Fuses
Typical application a) specialized Circuits b) industrial controls and panels c) isolated, inline fuse holders (street lightnings) d) Branch circuits protection
Bussmann series High-speed fuses
High-speed fuses provide superior protection or isolation for components such as diodes, silicon-controlled rectifiers (SCRs), Gate torn-Off Thyristors (GTOs), and IGBTs and in light and heavy harsh DC traction applications as high as 4000Vdc and 10,000A. Also used for the protection of DC-link/power converters. Optimized dimensions and materials allow for excellent thermal dissipation for high current cycling environments or heavy-duty applications
