Dynamic braking resistor in flat metal housing: focus on the RFD 200
The Fairfild RFD 200 is a resistor in a flat metal housing used as a dynamic braking resistor and as a capacitor charging and discharging resistor in RC circuits.
The product belongs to the industrial automation and energy sectors, two areas in which the RFD family finds application thanks to its construction configuration and available versions.
The RFD 200 can be evaluated when the application requires a resistor with a flat shape, installable in electrical panels and on heat sinks, with defined characteristics in terms of construction, protection, and connection.
What is the Fairfild RFD 200
The RFD is a wire-wound resistor on a mica plate coated with cement, immersed in quartzite sand and placed inside an anodized aluminium housing.
Sealing is carried out using silicone elastomer and ensures an IP54 protection rating. The flat shape of the resistor facilitates installation in electrical panels and on heat sinks.
This structure makes the RFD 200 a resistor with a specific configuration, designed for applications in which installation and integration into the electrical system are aspects to be considered together with the electrical data of the component.
Main applications
The main applications of the RFD 200 are dynamic braking and capacitor charging/discharging in RC circuits.
In the first case, the product is among the resistors that can be used for dynamic braking applications. In the second case, it is connected to RC circuits, where it can be used as a capacitor charging and discharging resistor.
These intended uses make it possible to include the RFD 200 in different application contexts, while always maintaining the reference to the family of resistors in flat metal housing.
Fields of use
The main application sectors of the RFD 200 are industrial automation and the energy sector.
In these areas, the RFD 200 is presented as part of the RFD family, a range of resistors in flat metal housing available in multiple models and configurations.
The connection with industrial automation and energy helps contextualize the use of the RFD 200 without limiting it to a single technical datum, highlighting the applications for which the family is intended.
Characteristics of the RFD family
The RFD family includes 8 models, with rated powers from 50 W up to 550 W and an ohmic value range between 0.25 Ω and 39 kΩ.
The UL-marked RFD version instead includes 6 models, with rated powers from 25 W up to 200 W and an ohmic value range between 1.5 Ω and 6 kΩ.
For the RFD 200 model, the main data are: continuous rated power of 140 W, tolerance ±5%, minimum resistance of 1.3 Ω, maximum resistance of 18,000 Ω, and rated insulation voltage of 1500 V.
These values make it possible to place the RFD 200 within the RFD family and distinguish it from the other models available in the range.
Available versions and options
The RFD family is available in different versions; the version with non-inductive winding must be requested from the Fairfild sales office.
The version with thermal pad is called RFDT. The RFDV version features a 45° cut of the housing and fastening by slots instead of holes. The RFDVT version combines the 45° housing cut with the thermal pad.
The RFD can also be purchased in the UL-marked version.
For the RFD 200, separately ordered options are available: out-of-spec ohmic values, ohmic value tolerance of 3%, 2%, 1%, 0.5%, and different cable length.
The presence of versions and options makes it possible to evaluate the most suitable configuration according to the model, ohmic value, tolerance, and required installation methods.
Installation instructions
The RFD 200 can be installed horizontally or vertically. In the case of vertical installation, the cables must face downwards.
Installation is carried out using the 4 available holes, or by slots in the case of the 45° RFDV version. The electrical connection is made through supplied unstripped cables.
The flat shape of the RFD facilitates installation in electrical panels and on heat sinks, a useful feature when the component must be integrated into defined spaces and configurations.
The Fairfild RFD 200 is a resistor in a flat metal housing designed for dynamic braking and capacitor charging/discharging applications in RC circuits.
Construction, protection rating, available versions, options, and installation instructions make it possible to evaluate it within the Fairfild range of resistors for industrial automation and energy.
