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Low power resistors FH

Low power resistors FH
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Low power resistors FH

Product catalog summary
Overview: This document provides technical specifications for wire wound resistors with vertical mounting in ceramic tubes, produced by KRAH Elektronische Bauelemente GmbH. It includes details on dimensions, resistance ranges, power ratings, and reliability.
Specifications:
  • Models: FH 0720, FH 0725, FH 0738, FH 0920, FH 0925, FH 0938, FH 0950, FH 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%) for CuNi 10 / CuNi 44 / NiCr, J (±5%) for CuNi 44 / NiCr.
  • Power Rating: Ranges from 4W to 17W depending on the model.
  • Dielectric Withstanding Voltage: ≥ 2000 Veff.
  • Limiting Voltage: Varies 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.
Procedures and Testing:
  • Solderability: Limited within a range of 5 mm for leads in ceramic casings.
  • Temperature Cycling: -55°C to +200°C with resistance change ≤ 2% + 0.1 Ω.
  • Damp Heat Test: 21 days at 40°C / 95% relative humidity with resistance change ≤ 3% + 0.1 Ω.
  • Reliability: Standard rating for complete failure at 70°C ambient temperature, 25% relative humidity, and 255°C surface temperature is ≤100 x 10-9/h.
Accessories: Fixing devices for FH and FTH models are available.
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Catalog excerpts

Low power resistors FH-1

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Standmontage - Keramikgehäuse Vertical mounting – Ceramic tube Montage vertical – 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 u = 25°C Puissance à Belastbarkeit bei Dissipation at u = 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 Befestigungsteile Fixing pieces Pièces de fixation 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 o = 150°C o = 200°C o = 255°C o = 200°C o = 250°C o = 300°C 200V CuNi 10: CuNi 44 / NiCr: CuNi 10: CuNi 44 / NiCr: SY 8,5; SY 8,5/1 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 : u=Umgebungstemperatur o=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 5 Lfd.-Nr.: 406, Stand 02 / 2013

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

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Standmontage - Keramikgehäuse Vertical mounting – Ceramic tube Montage vertical – Tube céramique Nennwiderstandswerte Prüfklasse nach IEC 68 Prüfung Lötung (Lotbad 260°C, Dauer 10s) Prüfung Temperaturwechsel (-55°C / +200°C) Prüfung Feuchte Wärme (21 Tage 40°C / 95% r.F.) Driftverhalten o = 255°C Die angegebenen Werte gelten für 99,7% aller Widerstände. Bei niederohmigen Widerständen können die angegebenen Änderungen um 0,1Ω überschritten werden. Zuverlässigkeit: Richtwert bei einer Umgebungstemperatur von 70°C, einer relativen...

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

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Standmontage - Keramikgehäuse Vertical mounting – Ceramic tube Montage vertical – 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 u = 25°C Puissance à Belastbarkeit bei Dissipation at u = 70°C Puissance à Durchschlagfestigkeit Dielectric withstanding voltage Rigidité...

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

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Standmontage - Keramikgehäuse Vertical mounting – Ceramic tube Montage vertical – Tube céramique Nennwiderstandswerte Prüfklasse nach IEC 68 Prüfung Lötung (Lotbad 260°C, Dauer 10s) Prüfung Temperaturwechsel (-55°C / +200°C) Prüfung Feuchte Wärme (21 Tage 40°C / 95% r.F.) Driftverhalten o = 255°C Die angegebenen Werte gelten für 99,7% aller Widerstände. Bei niederohmigen Widerständen können die angegebenen Änderungen um 0,1Ω überschritten werden. Zuverlässigkeit: Richtwert bei einer Umgebungstemperatur von 70°C, einer relativen...

 Open the catalog to page 4
Low power resistors FH-5

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Standmontage - Keramikgehäuse Vertical mounting – Ceramic tube Montage vertical – Tube céramique Zubehör / Accessories / Accessoires Befestigungsteile für FH und FTH Fixing devices for FH and FTH Pièces de fixation pour FH et FTH S = Abstand des Widerstandes von der Leiterplatte S = Distance of the resistor to conductive plate S = Distance de la résistance à la plaque conductrice KRAH ELEKTRONISCHE BAUELEMENTE GMBH, Märkische Straße 4, 57489 Drolshagen, Telefon: 02761/701-0, Telefax: 02761/701-177 Seite 5 von 5 Lfd.-Nr.: 406,...

 Open the catalog to page 5

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