AC, CS Resistor Overview Datasheet by Vishay Beyschlag/Draloric/BC Components

VISHAYE A or SOLUTIONS
AC..CS
SAFETY WIREWOUND RESISTOR
VISHAY.
INTRODUCTION
This presentation provides an overview of the AC03..CS and AC05..CS fusible wirewound safety resistor series. The
electrical parameters of the safety resistor series will be shown in the upcoming slides as well as features, benefits, and
applications..
Purpose
•Overview of the AC03..CS and AC05..CS fusible wirewound safety resistors
Objectives
•Present an overview of this product’s special electrical parameters
•Discuss product features
•Discuss product advantages
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UL1412 recognized fusible wirewound resistor; UL file no. E362452
Surge voltage capability as per 1.2/50us pulse in IEC 61000-4-5:
•For AC03..CS: 2 kV (4.7 Ω to 91 Ω) and 4 kV (100 Ω)
•For AC05..CS: 4 kV (10 Ω to 20 Ω) and 6 kV (22Ω to 100 Ω)
Fusing time:
•For AC03..CS: < 25 s for 45 W overload
•For AC05..CS: < 45 s for 100 W overload
Ohmic range:
•For AC03..CS: 4.7 Ω to 100 Ω, 5 %
•For AC05..CS: 10 Ω to 100 Ω, 5 %
Non-flammable silicone cement coating for immediate interruption without flame and explosion when
mains voltage (230 VAC) is applied
MAIN FEATURES OF THE AC..CS
Encapsulated by a special lacquer that exhibits superior safety fusing, the Vishay AC..CS series is UL1412 recognized.
Additionally, the 3W (AC03..CS) and 5W (AC05..CS) safety wirewound resistors exhibit pulse handling capabilities up to
4kV and 6kV respectively. The AC03.CS series is offered from 4.7Ω to 100Ω while the AC05..CS series is offered from
10Ω to 100Ω.
VISHAY.
COMPETITIVE BENEFITS
AC..CS components use specially selected resistive winding wire and a special nonflammable silicone cement coating
material to ensure safe and silent fusing operation in overload conditions. This allows components from the series to be
used as fusible safety resistors (or AC mains voltage input resistors). Under normal operation these resistors act as an in-
rush current limiting resistor with a surge capability of up to 4 kV for the AC03..CS or 6 kV for the AC05..CS. Additionally,
resistors from this series fuse “without a bang” when an AC mains voltage 115 VAC or 230 VAC is applied. This means that
AC..CS components can be used to meet the requirements of safety approval while eliminating the need for additional
fuses in series with a standard input resistor.
safety-
fusible
high
surge
Fusible
Wirewound
Safety
Resistor
The AC..CS is a dual resistor
FUSING OPERATION
The special non-flammable silicone cement coating utilized in the construction of the AC..CS helps to prevent a flame or
explosion from occurring when an AC mains voltage 115 VAC or 230 VAC is applied. To compare, fusible resistors offered
by competitors produce heavy and visible sparks under similar overload conditions. In addition to being nonflammable, the
specially developed lacquer coating meets the excellent thermal and electrical insulating properties of standard silicone
cement coatings.
Vishay AC..CS safety resistor
fuses silently without spark or
explosion
Safe and silent fusing operation in overload conditions
Fusible resistor offered by
competitors fuses with spark
and explosion
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FUSING CHARACTERISTICS
The AC..CS resistor series is designed with specially selected resistive wire and multilayer coating allowing for well-
defined fusing behavior when exposed to overload power. For example, the AC03..CS series has a fusing time of less than
25s when exposed to a 45W overload condition while the AC05..CS series has a fusing time of less than 45s when
exposed to a 100W overload condition.
The AC..CS has well-defined fusing characteristics when exposed to overload
VISHAY. A003..CS. ACOS..CS, 47R. Safety 0.41 uF Vlfirewound Capacitive Voltage L Resistor Power Supply Rectifier Regulator 7805 Filter Cap 220 uF/25 v in W Load .J Ion. ACOCLCS. ACOSHCS, 47?. Safe 0,41 uF Wirewoun Capacitive Resistor Power Supply L |— X2 MOV 01 [AF short circuit 115 V/230 VRMS Salety due to fault Cap WCUTEHCC ACOSNCS. ACOS..CS. 47R, Safely 0‘41 uF Wirewound Capacitive Resistor Power Supply L l— Fused/DC resistor 115 V/230 VRMS disconnects restollhe
INRUSH CURRENT CONTROL
In the schematic shown above (on the left), the AC..CS safety resistor is being used to limit inrush current. The ohmic
value should be carefully chosen to avoid dissipating too much power while being large enough to limit inrush current.
When the MOV is short-circuited during a fault condition (as shown in the top right image), the mains voltage 115 VAC
or 230 VAC appears across the safety resistor, drawing a high current and eventually fusing the resistor. This creates
an open circuit (as shown in the bottom right image). In this design, the resistor helps to protect the other circuit
sections during a voltage surge, all without creating a flame, spark or explosion.
— VISHAY. V V-_~ WW . Hm -'I
APPLICATIONS
These wirewound resistor series were especially designed for industrial applications like energy meters. Also due to its
safety features it is used in applications like washing machines, dishwasher, and battery chargers. The AC..CS series from
Vishay may be used in applications of different market segments, from consumer to industrial segment. There is a place
for the AC..CS in a variety of circuitry types where safety requirements and high surge voltage are required.
Power Meter
Smart Grid Solutions
Domestic Appliances
•Washing Machine
•Dishwasher
Battery Chargers
Arc Fault Breaker
Fire Control Systems
Power Supply
VISHAY.
SUMMARY
In summary, Vishay AC03..CS and AC05..CS series are the most suitable products recommended in applications
specifically with safety concerns. The products are UL certified which makes them ideal to be used in power
applications, power supplies, and power meters.
Dual resistor: fusible-safety and high surge voltage
Safe fusing without “spark” or “explosion”
UL1412 recognized
Inrush current limiting and circuit protection
Perfect choice for designing energy meters and power supplies