Resistors are a fundamental component of load banks and dummy loads. These are devices used for testing the performances of electric power sources, like batteries and generators, without having to connect them to their standard output channels. They perform this task by simulating the standard load the source would operate with, dissipating the electric energy in the form of heat.
Dummy load resistors are a crucial component of load banks, at least in their resistive and reactive-resistive variants. In turn, load banks are employed in a variety of sectors, but mostly to test:
generators and batteries
wind turbines and solar-panel plants
Moreover, dummy loads are employed when it is necessary to dissipate considerable amounts of electric energy, for instance in short circuit tests.
FAIRFILD’S DUMMY LOAD RESISTORS
Fairfild develops several custom dummy loads each year, based on the specific needs of clients. But Fairfild also has a wide array of resistors available off-the-shelf, perfectly suited to feature in load banks and dummy loads.
RXT series (9 models):
Enclosure frame is made of galvanized steel and has an IP23 degree of protection (IP20, AISI 304 and AISI 316L enclosures are also available). The power terminals are nickel plated brass screw terminals and are found inside a terminal box. The box is equipped with thermal pad with proper terminal on the outside of the metal strap. The maximum voltage of use is 1500 V.
RMS series (6 models):
The RMS series grant very low thermal resistance, as the wire is free to exchange heat with the surrounding air very efficiently. Even in terms of the heat capacity the RMS ensures very high performances. The maximum voltage of use is 2000 V or 3000 V in models with mica guide bars.
RDP series (7 models):
Like the RMS series, the RDP series grants very low thermal resistance, as the wire is free to exchange heat with the surrounding air very efficiently. The stainless steel terminals ensure a robust design ideal for high energy pulses and heavy overload. The maximum voltage of use is 2000 V.
RCE HP series (7 models):
The coating ensures the mechanical protection of the wire, while allowing for a uniform heat distribution and limiting thermal expansion of the coils. The maximum voltage of use is 3000 V (versions with mica guide bar for higher isolation levels are also available).
RCPO and RSPO series (11 models).
The greater heat exchange surface area, due to the winding with ribbed rectangular wire, allows reaching higher values of dissipated power. The RCPO and RSPO series are available in versions with adjustment slider. In this case, they are called RCPOR and RSPOR respectively. The maximum voltage of use varies depending on the model.