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Low power resistors FX

Low power resistors FX
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Low power resistors FX

Product catalog summary
Overview: This document provides technical specifications for wire wound resistors with axial wire terminals housed in ceramic tubes, produced by KRAH Elektronische Bauelemente GmbH. The document details various models, their dimensions, resistance ranges, power ratings, and other critical parameters.
Specifications:
  • Models: FX 0720, FX 0725, FX 0738, FX 0920, FX 0925, FX 0938, FX 0950, FX 0975.
  • Dimensions: Vary by model, ranging from 20 mm to 75 mm in length.
  • Resistance Range: CuNi 10, CuNi 44/NiCr with specific resistance values for each model.
  • Resistance Tolerances: K (±10%) and J (±5%) depending on material.
  • Power Rating: Ranges from 4W to 17W depending on the model.
  • Dielectric Withstanding Voltage: ≥ 2000 Veff.
  • Limiting Voltage: Ranges from 150V to 500V.
  • Temperature Coefficient: CuNi 10: +350 to +450 x 10-6/K; CuNi 44/NiCr: -80 to +200 x 10-6/K.
  • Surface Temperature Limit: CuNi 10: 200°C; CuNi 44/NiCr: 320°C.
Performance and Reliability:
  • Nominal Resistances: Series E 12 (10%) and Series E 24 (5%).
  • Climatic Category: IEC 68 55/250/10.
  • Solderability: ≤ 1% + 0.1 Ω at 260°C for 10 seconds.
  • Temperature Cycling: ≤ 2% + 0.1 Ω from -55°C to +200°C.
  • Damp Heat: ≤ 3% + 0.1 Ω over 21 days at 40°C and 95% relative humidity.
  • Resistance Change at 255°C: Varies over time, with specific percentage changes noted for 1,000, 10,000, and 100,000 hours.
  • Reliability: Standard rating for complete failure is ≤100 x 10-9/h at 70°C ambient temperature, 25% relative humidity, and 255°C surface temperature.
Additional Notes:
  • The solderability of leads in ceramic casings is limited to a range of 5 mm.
  • Marking of values is according to DIN/IEC 62 standards.
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Catalog excerpts

Low power resistors FX-1

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique Bauform Style Modèle Abmessungen Dimensions Dimensions Trägerkörper Carrier Support Widerstandswertbereich Resistance range Plage de valeurs Widerstandswert-Toleranzen Resistance tolerances Tolérances sur la résistance Nennlast Pn Power rating Pn Puissance nominale Pn Belastbarkeit bei Dissipation at ϑu = 25° C Puissance à Belastbarkeit bei Dissipation at ϑu = 70° C Puissance à Durchschlagfestigkeit Dielectric withstanding voltage Rigidité diélectrique Grenzspannung U Limiting voltage U Tension limite nominale U Temperaturkoeffizient Temperature coefficient Coefficient de température Zul. Oberflächentemperatur Lim. surface temperature Lim.température surface Kennzeichnung Marking Marquage Glasfaserkordel Fiber glass core Fibre de verre CuNi 10 CuNi 44/NiCr K (±10%) CuNi 10 / CuNi 44 / NiCr J (±5%) CuNi 44 / NiCr 4W ϑo = 150° C ϑo = 200° C ϑo = 255° C ϑo = 200° C ϑo = 250° C ϑo = 300° C 200V CuNi 10: CuNi 44 / NiCr: CuNi 10: CuNi 44 / NiCr: Klartext, Wertkennzeichnung DIN/IEC 62 Cipher stamped, the marking of values according to DIN/IEC 62 En clair, du marquage de la valeur DIN/IEC 62 Anmerkung : ϑu=Umgebungstemperatur ϑo=Oberflächentemperatur Notes: Ambient temperature Surface temperature Nota: Température ambiante Température surface * Bei Widerständen im Keramikgehäuse ist die Lötbarkeit der Anschlussdrähte in einem Bereich von 5 mm eingeschränkt. *The solderability of leads of resistors mounted in ceramic casings is limited within a range of 5 mm. * La soudabilité des fils de connexion des résistances montées dans un boîtier céramique est limitée dans une gamme de 5 mm. Bestellbeispiel: Order designation: Code de commande: KRAH ELEKTRONISCHE BAUELEMENTE GMBH, Märkische Straße 4, 57489 Drolshagen, Telefon: 02761/701-0, Telefax: 02761/701-177 Seite 1 von 4 Lfd.-Nr.: 404, Stand 08 / 2010

 Open the catalog to page 1
Low power resistors FX-2

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique Nennwiderstandswerte Prüfklasse nach IEC 68 Prüfung Lötung (Lotbad 260° Dauer 10s) C, Prüfung Temperaturwechsel (-55° / +200° C C) Prüfung Feuchte Wärme (21 Tage 40° / 95% r.F.) C Driftverhalten ϑo = 255° C Die angegebenen Werte gelten für 99,7% aller Widerstände. Bei niederohmigen Widerständen können die angegebenen Änderungen um 0,1 überschritten werden. Zuverlässigkeit: Richtwert bei einer Umgebungstemperatur von...

 Open the catalog to page 2
Low power resistors FX-3

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique Bauform Style Modèle Abmessungen Dimensions Dimensions Trägerkörper Carrier Support Widerstandswertbereich Resistance range Plage de valeurs Widerstandswert-Toleranzen Resistance tolerances Tolérances sur la résistance Nennlast Pn Power rating Pn Puissance nominale Pn Belastbarkeit bei Dissipation at ϑu = 25° C Puissance à Belastbarkeit bei Dissipation at ϑu = 70° C Puissance à Durchschlagfestigkeit Dielectric withstanding...

 Open the catalog to page 3
Low power resistors FX-4

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique Nennwiderstandswerte Prüfklasse nach IEC 68 Prüfung Lötung (Lotbad 260° Dauer 10s) C, Prüfung Temperaturwechsel (-55° / +200° C C) Prüfung Feuchte Wärme (21 Tage 40° / 95% r.F.) C Driftverhalten ϑo = 255° C Die angegebenen Werte gelten für 99,7% aller Widerstände. Bei niederohmigen Widerständen können die angegebenen Änderungen um 0,1 überschritten werden. Zuverlässigkeit: Richtwert bei einer Umgebungstemperatur von...

 Open the catalog to page 4

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