MB 7466946 OOO0b4? 134 PRECISION FAILSAFE THERMAL-FUSE RESISTORS CUSTOM DESIGN - /2W to 60 WATT TF SER FEATURES The Ultimate Failsafe Design! @ Instrinsically safe, completely flameproof. RCDs TF series was developed to achieve a performance level Component opens without hazard of overheating. previously unavailable in a fuse resistor design. M@ Meets UL, FCC, REA and EIA requirements @ Fusing-to-Operating current ratio as low as 1.25:1! @ Fusing times can be custom tailored MH Precison tolerance to +0.1%, TCs to S5ppm M@ Pulse Withstanding Design Available - designed to Under overload conditions the temperature rise of the resistor element is sensed by a thermal link, which permanently opens upon reaching a predetermined temperature. Devices can be custom tailored to the fault conditions and do not require the large power overloads necessary with other fuse resistors. The dissipate short term pulses (such as lightning surge or TF Series therefore offers greater safety since high temperatures capacitor discharge) Refer to option 'P, page 55 are not required to achieve fusing. Typical applications include Mi Vertical Mount Packages Available ; telecom line cards, repeaters, trunk carrier systems, RFI sup- @ Aluminum housed chassis mount packages available pression, and step-down resistors for automobile fan motors. Mf Available on exclusive SW/FT delivery program TF Series | TEV Series CONSTRUCTION Ceramic Case 1.0(25.4]Min. A be- A+ +B Resistor Element + T Fusible Link TF [o] il 3 |_ 1.0[25.4]Min =}=-4-= 04811. + Cl _ L { TFA EF j 3 7 4 TT TT Ya Typ 04 Max 4].150Min. Biel] To -s-| 200 T a Fos Wattage Available - Standard DIMENSIONS RCD : Voltage Rating Fusing . Resistance D5 + .032 [.81] Type at 25C? Range? Rating4 Range A + 032 [.81] | B + .032[.81] | C + 0320.81} | Oo onal) TFO1S 1W 3W to 15W 40V 05M to 1K 70 [17.8] 26 [6.6] 26 [6.6] 06 [1.5] TFO1 1W 5W to 15W 50V 059 to 4K 88 [22.4] 31 [7.9] 31 [7.9] 06 [1.5] TFO2 2w 7W to 20W 100V .059 to 10K 95 [24.1] 28 [7.1] 28 [7.1] N/A TFO4 4W 40W to 25W 150V 052 to 25K 4.39 [35.3] 38 [9.7] 35 [8.9] 12 [3.0] TFOS 5W 15W to 35W 200V 052 to 40K 1.88 [47:8] 38 [9.7] 38 [9.7] 12 (3.0} TFO7 7W 20W to 50W 400V .05Q to 60K 1.88 [47.8] 50 [12.7] 50 [12.7] 12 [3.0] TFV2 2W 7W to 20W 100V 050 to 10K .436 [11.0] 30 [7.6] 80 [20.3] N/A TFV3 3w 10W to 25W 150V 050 to 20K 515 [13.0] 40 [10] 1.00 [25.4] N/A 1 Other sizes available fram %W ta GOW. 2 Dual wattage rating up to double those listed are available. Derate to zero walts at 155C, 3 Fusing wattage to be specified by customer. 4 Maximum working voltage determined by E = J PR, E should not exceed value listed in column above. 5 Standoffs are optional, specify when ordering. 6 Resistance range from .005Qto 1MQ available. , : : SPECIFICATIONS ORDERING INFORMATION: Tolerance: 0.1% to 10% available Please include the following information to enable us to offer the Temperature Coefficient: + 100 ppm standard, T.C.s to most appropriate design. Di 5 aaa are available 1. Continuous wattage or current rating eigen : trength: 500 VAC 2. Ambient temperature One St eee Min. pale oC 3. Fusing wattage or current perating Temp. Range: 55C to + 155 standard, 4. Min. and max blow time temperature ratings up to + 225C available . 5. Resistance value and tolerance APPLICATION NOTES 6. Physical size, standoff option 1. All units are custom tailored to specific application 7. Voltage level, wave form, and frequency requirements. 8. General description of the application 2. Maximum standard temperature rating is 155C. Subjecting Also include any information as to pulse conditions which the the device to temperatures above this level may result in fuse resistor must dissipate. degradation. Temperature ratings up to + 225C available. 3. Use caution when soldering or welding these devices. It is suggested that the connections be made 1/2 or more from the body utilizing a heat sink to transfer heat from the body. RCD Components, Inc., 520 East Industrial Park Dr., Manchester, NH USA 03109 54 Tel: (603) 669-0054 Fax: (603) 669-5455