TOKEN FVR Rheostat Variable Power Resistors Rheostat Variable Power Resistors C-shaped Wirewound Variable Resistors - FVR Series Rheostat, Variable Resistors Control The Speed of a Motor Preview Token’s Power Variable Resistor FVR Series is a C-shaped ceramic rod and wound with copper or chromium-alloy wire as a resistance element. Except for the slide contact surface, the entire component is coated with a high-temperature, non-flammable resin. After cooling and drying, insulation is applied through a high-temperature process. Then, a centered rotating adjuster component is installed, which slides along the resistance element and varies the resistance to the desired value. Variable Resistors are often called potentiometers in books and catalogues. Variable FVR may be used as a rheostat with two connections (the wiper and just one end of the track) or as a potentiometer with all three connections in use. Applications : ● Motor controller also use FVR Series as rheostats or potentiometer to control the speed of a motor by limiting the flow of current through them. ● They are used in many small appliances such as blenders, mixers, fans, and power tools. ● FVR Rheostats Series are also used as test instruments to provide an accurate resistance value. ● While FVR can be used to control electric ovens and cooktops, thermostats are preferred because they have additional parts which automatically adjust the current flow to maintain a constant temperature. Features : ● Standard resistance tolerance is K(±10%). Closer tolerances are available upon request. ● 3 Wattage Rating styles to choose: 25W, 50W, and 100W. ● Wide Max. Resistance range: 5Ω ~ 5KΩ. The FVR Series is RoHS compliant and lead free. For non-standard technical requirements and custom special applications, please contact us. Version 2010 http://www.token.com.tw/ rfq token.com.tw 01 of 03 TOKEN FVR Rheostat Variable Power Resistors (FVR) 25W - 100W Dimensions J E A H B D I C Variable Resistors Top View (FVR) Dimensions Wattage Rating 25W 50W 100W A 2.5 4.2 4.2 B 3.2 4.2 4.2 C 22 28 42 K G F Variable Resistors Side View (FVR) Dimensions D 3/8” 3/8” 3/8” Dimensions(mm) E F G 6x12 42 50 6x12 64 60 6x12 85 75 H 50 70 90 Variable Resistors Bottom View (FVR) Dimensions I 11 11 11 J 5 8 8 K 10 14 14 Weight 74/g 160/g 372/g Resistance Range(Ω) 5Ω-2.5KΩ 7Ω-3.5KΩ 10Ω-5KΩ Application Notes Determination of End Resistance Value of FVR, DQS, DSRA, DSRB, BSR, BSQ: ● Resistance Range means you can choose one maximum resistance value (End resistance value) at one of FVR, DQS, DSRA, DSRB, BSR, BSQ VR (Variable Resistor) type. ● After End Resistance Value confirmed, the minimum resistance (start resistance value) will be determined by depending on resistance of wire and wirewound type. Power Rating of Variable Resistor: The part Nunber formation of FVR, DQS, DSRA, DSRB, BSR, BSQ: Product type - Rated Wattage - Resistance Value (Ω) - Resistance Tolerance Product type means one of FVR, DQS, DSRA, DSRB, BSR, BSQ. Rated Wattage means power rating at End Resistance Value. Resistance Value (Ω) means maximum resistance value (End Resistance Value). Resistance Tolerance means precision range of End Resistance Value. 1. Power Rating of VR (Variable Resistor) is determined by the maximum resistance value (End Resistance Value). 2. Resistance and Power Rating should be decreased while you are adjusting the screw. 02 of 03 http://www.token.com.tw/ rfq token.com.tw Version 2010 TOKEN FVR Rheostat Variable Power Resistors Notes: ● Adjustability is 10% to 90% of full resistance value. ● Wattage is proportional to this adjusted resistance value. Power Rating: ● Based on 25°C free air rating. The stated wattage rating applies only when the entire resistance is in the circuit. ● Setting the lug at an intermediate point reduces the wattage rating by approximately the same proportion. ● Example: If the lug is set at half resistance, the wattage is reduced by approximately one-half. If you need current constant type or special specifications, please feel free to cntact us. Performance Specifications Test Item Resistance tolerance Insulation resistance Dielectric withstanding voltage Terminal strength Vibration Load life Full gyration angle Flame retardation Remarks Test Methods JIS-C-5261 5-1 JIS-C-5261 6-1 500VDC JIS-C-5261 7-1 1000VDC 1 minute Between terminal and axis JIS-C-5261 6-5 3kg 30 seconds JIS-C-5261 6-6 1.5m/m 10 ~ 50 ~ 10 Hz/min X-Y-Z 2 hours each Characteristics Resistance tolerance ±10% 100MΩ min Free of appearance or structural irregularity Free of appearance or structural irregularity ΔR/R≤ ±(2%+0.1Ω) Free of appearance or structural irregularity ΔR/R≤ ±(2%+0.1Ω) Free of appearance or structural irregularity JIS-C-5261 7-7 ΔR/R≤ ±(5%+0.1Ω) JIS-C-5261 6-1 300± 5°C US UL-94 flame retardation test V-0 grade 100% - 600% rated wattage load noncombustible 1. Resistance and resistance tolerance were tested in-house with micro resistance meter. 2. Coating refers to UL-certified data provided by supplier. How to Order FVR 25W 2.5KR K Part Number: FVR Rated Power (W): 25W Resistance Tolerance (%) 50W 100W Resistance Value (Ω): Indicates resistance value in units of ohms. Code K Resistance Tolerance ±10% Back to 1st Page - Power Rheostat Variable Resistors (FVR) Version 2010 http://www.token.com.tw/ rfq token.com.tw 03 of 03