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Krah Group
Low power resistors KST

Low power resistors KST

Product catalog summary

Overview: This document provides technical specifications for wire wound resistors manufactured by KRAH ELEKTRONISCHE BAUELEMENTE GMBH. It includes details on dimensions, resistance ranges, power ratings, and reliability under various conditions.

Specifications:

Styles and Models: KST, KFL, KRD with dimensions of 50 mm, 75 mm, and 100 mm.
Resistance Range: CuNi 10, CuNi 44/NiCr with values ranging from R18 to 75K.
Resistance Tolerances: ±10% for CuNi 10, ±5% for CuNi 44/NiCr.
Power Ratings: 15 W, 25 W, 30 W with dissipation values at different temperatures.
Dielectric Withstanding Voltage: ≥ 2000 Veff.
Limiting Voltage: 350 V, 500 V, 750 V.
Temperature Coefficient: CuNi 10: +350 to +450 x 10^-6/K, CuNi 44/NiCr: -80 to +200 x 10^-6/K.
Surface Temperature Limits: CuNi 10: 200 °C, CuNi 44/NiCr: 300 °C.

Testing and Reliability:

Nominal Resistances: Series E 12 (10%), 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 between -55°C and +200°C.
Damp Heat Test: ≤ 3% + 0.1 Ω over 21 days at 40°C and 95% relative humidity.
Resistance Change at 255°C: 1,000 h: -1.5% to +4.0%, 10,000 h: -2.0% to +6.0%, 100,000 h: -3.0% to +10.0%.
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.

Ordering Information: Example provided for ordering 1000 pieces of KST 1375 560R K.

Catalog excerpts

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Flachsteck-, Löt- oder radialer Drahtanschluss Connector blades, soldering connections or radial leads Raccordements à fiches plates, soudés ou à fil radial 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 15 W ϑo = 150° C ϑo = 200° C ϑo = 255° C ϑo = 200° C ϑo = 250° C ϑo = 300° C 500 V 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 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 2 Lfd.-Nr.: 405, Stand 07 / 2010

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Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Flachsteck-, Löt- oder radialer Drahtanschluss Connector blades, soldering connections or radial leads Raccordements à fiches plates, soudés ou à fil radial 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:...

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