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FAILSAFE FUSE RESISTORS 1/2 WATT to 50 WATT
RESISTORS CAPACITORS COILS DELAY LINES RCD Term.W is RoHS compliant & 260C compatible
FR SERIES
RoHS
Precision Grade Fuse Resistors!
RCD's FR Series was designed to obtain the best from two devices. It combines the performance of a precision grade resistor with precisely controlled fusing characteristics. Typical applications include protection for zener diodes and other semiconductor components, emitter resistors for current sharing transistors, Squib circuits, and/or other circuits that require precision fusing chracteristics unobtainable with traditional fuses. Please note that due to the inherent compromise involved between resistive vs. fusing performance it is recommended that prior consultation be made with RCD's engineering department to obtain the optimum design. Parts intended for high-reliability applications are available with burn-in (opt. ER) and/or military screening.
Precision performance, flameproof design per UL94V-0 Fusing-to-Operating current ratios as low as 3:1! Fusing times available from 1 millisecond to 30 seconds Available on exclusive SWIFTTM delivery program Custom design available for increased surge capability (specify Option P) Also available: Hi-Rel screening, burn-in, custom marking, etc.
| | 1.0" [25.4] min.| | SPECIFICATIONS
RCD Wattage Type* @25C(W25) FR1/2 0.5 FR1 1.0 FR2 2.0 FR3 3.5 FR5 5.5
L
|

D

d
PERFORMANCE CHARACTERISTICS
L .04 [1] D.02 [.5] .29 [7.4] .60 [15.2] .69 [17.5] .58 [14.7] .984 [25] .125 .130 .170 .230 .323 [3.2] [3.3] [4.3] [5.8] [8.2] d typ .020 .020 .032 .032 .032 [.5] [.5] [.8] [.8] [.8]
Resistance Range .06 to 500 0.1 to 1.5K 0.1 to 2K 0.1 to 3K 0.1 to 5K
Tolerance Temperature Coefficient (typ) Dielectric Strength Insulation Resistance Derating
5% standard, 0.1-10% available 100ppm 0.1-.9, 50ppm 1 &up, available to 10ppm 750 VAC 1,000 megohms min. (dry) Derate linearly from full rated power @ 25C to zero power @175C (.67%/C)
* Other sizes available up to 50 Watt on a custom basis.
FUSING CHARACTERISTICS: Standard FR resistors are designed to fuse within 10 seconds as follows: FR1/2 to FR2 1 = 20 x W25 (20 times the 25C wattage rating), <1 = 40 x W25. FR3 & FR5 5 = 25 x W25 , <5 = 50 x W25. Faster fusing is available. Max. fault condition not to exceed 300x W25. Following chart depicts custom design capabilities.
Fusing Current (Amperes) 0.15 0.25 0.5 1.0 1.5 2.0 3.0 5.0 10 15 20 Minimum Resistance Value to Fuse in 1 Sec. or Less FR1/2 360 120 30 7.5 3.3 2.0 1.0 0.5 0.25 0.15 0.1 FR 1 720 240 60 15 7 4 2 1 .5 .3 .2 FR 2 1.44K 480 120 30 13 8 4 2 1 .6 .4 FR 3 2.88K 960 240 60 26 16 8 4 2 1.2 .8 FR 5 5.76K 1920 480 120 53 32 16 8 4 2.4 1.6 Minimum Resistance Value to Fuse in 5 Sec. or Less FR1/2 180 60 15 3.8 1.7 1.0 0.5 .25 .13 .08 .06 FR 1 360 120 30 7.5 3.3 2 1 .5 .25 .15 .10 FR 2 720 240 60 15 7 4 2 1 .5 .3 .2 FR 3 1.44K 480 120 30 13 8 4 2 1 .6 .4 FR 5 2.88K 960 240 60 26 16 8 4 2 1.2 .8
APPLICATION & DESIGN NOTES:
1. 2. 3. 4. Fusing current should be 4 times the continuous current for best performance. Resistors reach elevated temperatures prior to opening- elevate body above the PCB. Exercise care when testing fuse resistors. RCD can custom manufacture fuse resistors from 1/8W to 50W per customer req't. Design objectives are achieved by element material (wirewound or film), insulation (silicone, ceramic, epoxy), and process (alloy & resistor geometry). 5. Thermal fuses are also available and are designed to "blow" when the resistor body or the ambient temperature reaches preset temperature (110C to 240C). 6. Custom surge-tolerant fuses are designed not to "blow" due to short term voltage transients, lightning surges, or capacitor discharges, but will fuse under longer term overloads. Consult factory for details. 7. Please include the following information when customized design is required: Continuous wattage or current; ambient temperature; fusing wattage or current; minimum and maximum "blow" times; resistance value & tolerance; max. size; voltage level, AC or DC, wave form, & frequency; and a general description of the application. Include info as to any pulse or overload conditions that the resistor must withstand.
P/N DESIGNATION:
FR1 - 101 - J B W
RCD Type Options: P, ER (additional options to be assigned by RCD, leave blank if std) Resis. Code: 1%: 3 signif. figures & multiplier, e.g. R100= 0.1, 1R00= 1,1000= 100, 1001= 1K. Resis. Code 2% - 10%: 2 signif. figures & multiplier, e.g. R10= 0.1, 1R0= 1,100= 10, 102= 1K. Tolerance: K=10%, J=5% (std), H=3%, G=2%, F=1%, D=0.5%, C=0.25%, B=0.1% Packaging: B= Bulk, T= T&R Optional Temp. Coef: (leave blank if standard) 10 = 10ppm, 25 = 25ppm, 50 = 50ppm, 101=100pm Termination: W= Lead-free, Q= Tin/Lead (leave blank if either is acceptable)
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:sales@rcdcomponents.com
FA062A Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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