Type SCR Commutating Capacitors
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com
Specications
Type SCRN Film-Paper/Extended Foil Commutating Capacitor
Type SCRN capacitors are for SCR (silicon controlled
rectier) commutating applications that require high peak
and rms current capability. These capacitors are ideal for
other high frequency and pulsed applications. The SCRN
is supplied in oval or rectangular metal cases with 1/4
x 20 threaded stud and insulated terminals to withstand
high current and high peak voltages.
Highlights
• Conforms to EIA RS401 for power semiconductor
applications
• Non ferrous covers available for high frequency
applications
• 40,000 hours life at full rated voltage and
temperature
• High voltage, high current and high frequency
0.25 µF to 50.0 µF
200 Vpk to 2000 Vpk
±10%
–40 ºC to +65 ºC
+80 ºC
Ratings
Capacitance Range:
Voltage Range:
Capacitance Tolerance:
Temperature Range:
Surface Temperature:
Cap Catalog Case H Max VA Max
(µF) Part Number Code (In.) (65 ºC) (Arms)
200 Vpk (Paper Dielectric)
3 SCRN201R-F A 2.13 400 60
5 SCRN202R-F A 2.63 465 60
10 SCRN203R-F A 3.88 625 60
15 SCRN205R-F A 4.75 765 60
20 SCRN206R-F B 4.25 875 60
30 SCRN208R-F C 5.25 1200 60
40 SCRN209R-F C 6.75 1500 60
50 SCRN210R-F D 5.75 1590 60
400 Vpk (Film and Paper Dielectric)
2 SCRN211R-F A 2.63 790 60
3 SCRN212R-F A 2.63 970 60
5 SCRN213R-F A 3.88 1130 60
10 SCRN214R-F B 4.75 1930 60
15 SCRN215R-F C 4.75 2240 60
20 SCRN216R-F C 6.25 2800 60
30 SCRN217R-F D 6.75 3720 60
40 SCRN218R-F D 8.00 4330 60
50 SCRN219R-F E 6.25 6050 100
600 Vpk (Film and Paper Dielectric)
2 SCRN220R-F A 2.63 815 60
3 SCRN221R-F A 3.13 1200 60
5 SCRN222R-F A 4.25 1420 60
10 SCRN224R-F C 4.25 2040 60
15 SCRN226R-F C 5.75 2800 60
20 SCRN227R-F D 5.75 3260 60
25 SCRN229R-F D 6.75 3720 60
30 SCRN230R-F D 8.00 4330 60
40 SCRN231R-F E 6.25 6060 100
50 SCRN232R-F E 7.25 6850 100
Cap Catalog Case H Max VA Max
(µF) Part Number Code (In.) (65 ºC) (Arms)
600 Vpk (Film Dielectric for Low-loss)
1 SCRN262R-F A 2.38 2200 60
2 SCRN263R-F A 2.38 2060 60
3 SCRN264R-F A 3.88 3190 60
5 SCRN265R-F A 4.25 4380 60
10 SCRN266R-F C 4.25 6060 60
1000 Vpk (Film and Paper Dielectric)
1 SCRN233R-F A 2.13 790 60
2 SCRN234R-F A 3.13 1070 60
3 SCRN235R-F A 3.88 1455 60
5 SCRN236R-F B 4.25 1785 60
10 SCRN237R-F C 5.75 2570 60
15 SCRN238R-F D 5.75 3170 60
20 SCRN239R-F E 5.13 5200 100
1500 Vpk (Film and Paper Dielectric)
.5 SCRN240R-F A 2.13 990 60
1 SCRN241R-F A 2.88 1240 60
2 SCRN242R-F B 3.50 1890 60
3 SCRN243R-F C 4.25 2550 60
5 SCRN244R-F C 5.75 3250 60
10 SCRN245R-F E 5.13 6500 100
2000 Vpk (Film and Paper Dielectric)
.25 SCRN246R-F A 2.13 990 60
.33 SCRN257R-F A 2.13 1000 60
.5 SCRN247R-F A 2.63 1180 60
1 SCRN248R-F A 3.13 1300 60
2 SCRN249R-F B 4.25 2230 60
3 SCRN251R-F C 4.75 2800 60
5 SCRN253R-F D 5.75 4020 60
10 SCRN256R-F F 5.75 7600 100
Complies with the EU Directive 2002/95/EC
requirement restricting the use of Lead (Pb), Mercury
(Hg), Cadmium (Cd), Hexavalent chromium (Cr(VI)),
PolyBrominated Biphenyls (PBB) and PolyBrominated
Diphenyl Ethers (PBDE).
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CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com
Type SCR Commutating Capacitors
Outline Drawings RoHS Compliant
Figure 2
Figure 1
Mounting Hardware
See catalog page 5.000 for hardware
B
±.03”
B
±.03”
D
±.06”
D
±.06”
1/4 - 20 THD
2 Plcs) 1/4 - 20 THD
2 Plcs)
A
±.03”
A
±.03”
H
±.06”
H
±.06”
C
±.06”
C
±.06”
F
±.03”
F
±.03”
Case Dimensions Inches
Code A B C D F H Figure
A1.31 2.16 0.56 1.19 0.81 see table Fig. 1
B1.56 2.69 0.50 1.13 1.25 see table Fig. 1
C1.91 2.91 0.50 1.13 1.38 see table Fig. 1
D1.97 3.66 0.50 1.13 1.38 see table Fig. 1
E2.84 4.56 0.50 1.13 2.00 see table Fig. 2
F3.75 4.56 0.56 1.19 2.00 see table Fig. 2
▼▼
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Type SCR Commutating Capacitors
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com
How to Choose a Commutating Capacitor
1. From circuit analysis or measurement, determine
application values for these six parameters:
Nominal capacitance in µF
Current pulse width in µs
Current pulse period in µs
Maximum peak voltage
Continuous AC voltage in Vrms
Maximum volt-amps (VA)
2. Choose a capacitor from the ratings table of the desired
nominal capacitance with a peak voltage rating no less than
your maximum peak voltage.
3. Check that your application’s rms current is no more
than the capacitor’s Max. Amps RMS. You can calculate
the current from your Vrms using the equations in the
following section.
4. Check that your application’s volt-amperes is not more
than the capacitor’s VA capability. The VA capability is the
max VA rating times the Volt-Ampere multiplier from Figure
2 (Current Pulse Width) and that times the Volt-Ampere
Multiplier from Figure 3 (Ambient Temperature). See the
following section for more on using volt-ampere multipliers
.
If you need a greater VA capability, repeat these steps for a
higher peak voltage capacitor or consider connecting units in
parallel to divide the VA required. For up to peak voltage of
600 V, you may also consider polypropylene lm dielectric
units, Catalog Numbers SCRN262R through SCRN266R,
with higher VA capability.
Using Volt-Ampere Ratings
The capacitors maximum VA rating is the maximum product
of the sine wave voltage and current that may be applied at
65 ºC without overheating the capacitor and reducing its
expected life. For other temperatures and pulsed current, use
the multipliers of Figures 2 and 3 to derate the Max VA rating.
The Max Amps RMS rating is set by the capability of the
capacitor terminals. Exceeding this limit can damage the
terminals and cause capacitor failure.
Calculate the capacitor’s actual VA load as the product of the
rms voltage across the capacitor and the rms current through
the capacitor. To calculate rms current for an applied sine
wave or squarewave voltage, use these equations.
For a sinewave voltage the current is:
Irms = 2π fCVrmsX10-6
and for a squarewave the current is:
Irms = C∆V/[0.64(tT)0.5] = Ipeak(t/T)0.5
where (f) is repetition frequency in Hz, C is nominal
capacitance in µF, ∆V the peak-to-peak squarewave amplitude
in volts, (t) is the pulse width in µs and T is the pulse period
in µs.
The peak current for the square wave voltage is:
Ipeak = C∆V/0.64t
Figure 1
Pulse Wave Applications
Figure 2
Figure 3
Polypropylene
PP Film/Paper
Paper
V peak
ΔV
Voltage
I peak
Current
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