AC03 Datasheet, PDF (1/4 Pages) celduc-relais – REED SWITCH NORMALY OPEN, DRY CONTACT

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AC03 Safety (AC03..CS)
Vishay Draloric
Axial Cemented Wirewound Safety Resistor
FEATURES
• Surge voltage capability: 2 kV (30 pulses/
15 min) as per IEC 61000-4-5. Higher surge
capability on customer request.
• Fusing time < 30 s for 45 W overload
• Tinned Cu wire terminations
• P₄₀ = 3 W
• Ohmic range: 10  to 100 , 5 %
• Special cement coating for immediate interruption without
flame and explosion when mains voltage (220 V_RMS) is
applied
• Specially designed for applications in electric appliances,
energy meters
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
Vishay has introduced special version of AC03 wirewound resistors to be used as fusible safety resistor (or, AC mains input
resistors). It uses specially selected resistive winding wire and special coating material to ensure safe and silent fusing operation
in overload conditions. The resistor fuses “without a bang” when AC mains voltage is applied. At the same time, it acts as a
in-rush current limiting resistor for the normal operation. The specially developed lacquer coating matches the thermal and
electrical insulating properties of standard silicone cement. This allows designers to more easily meet the requirements of UL
approval, whilst eliminating the need to put additional fuses in series with the input resistor.
In the conventional wirewound resistor, ceramic rod at the resistor's core acts as a heat sink for the wire element. This can delay
fusing, resulting in high temperatures to fragment the coating and ionize the air near the fusing spot. If ionization occurs close
to the cap edge and at a voltage peak in the mains cycle, it can initiate a momentary flashover outside the component body,
releasing far more energy than is required to fuse the wire element. Although the opening of the circuit is safe for most
applications, it can be with a “bang” with splattering of cement coating. This is un-safe operation and not desirable.
AC03 Safety resistor has new coating material and process to give silent and safe fusing. It can absorb thermal stresses without
fragmenting or burning of resistor coating.
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
POWER RATING POWER RATING
P_{40 °C}
W
P_{70 °C}
W
LIMITING
VOLTAGE
U_max.
RESISTANCE RANGE ⁽¹⁾

TCR = ± 200 ppm/K
AC03
3
2.5
PxR
10 to 100
Note
(1) _{Resistance value to be selected for ± 10 % tolerance from E12 and for ± 5 % from E24 series}
TOLERANCE
±%
5
Revision: 24-May-12
1
Document Number: 28861
For technical questions, contact: [e-mail]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000