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V131CA32 Datasheet(PDF) 7 Page - Littelfuse

Part No. V131CA32
Description  Varistor Products - High Energy Industrial Disc
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

V131CA32 Datasheet(HTML) 7 Page - Littelfuse

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www .littelfuse .com
Varistor Products
CA Varistor Series
High Energy Industrial Disc
Passivation Layer
The standard CA Series is supplied with passivation layer around the
outside perimeter of the disc forming an electrical insulator as detailed in
the dimensional drawing. The CA Series is also available without a
passivation layer for applications where the customer provides a suitable
encapsulation or potting material as recommended below.
(See Ordering Information.)
Encapsulated Recommendations
After lead attachment, the disc/lead assembly may be coated or
encapsulated in a package to provide electrical insulation and isolation
from environmental contamination as required by the application.
Coating/Filler materials for containers may include silicones,
polyurethanes, and some epoxy resins.Two examples of acceptable
polyurethanes are Dexter Hysol (US7013, parts A and B) and Rhenatech
(resin 4714, hardener 4900), or their equivalents. Materials containing
halogens, sulfides, or alkalines are not recommended.
Electrode Metallization
The standard CA Series is supplied with sintered silver electrodes on
CA32 devices and arc-sprayed copper-over-aluminum electrodes for CA40
and CA60 series. CA40 parts are also available with sintered silver elec-
trode, see “Ordering information.” In general, when discs are stacked to
attain a specific operating voltage or energy capability, the copper finish is
typically chosen. Likewise, the copper finish is used with high temperature
lead attach soldering operations (wave solder). The silver metallization is
typically used for solder reflow lead attach operations (I-R, Vapour-Phase).
The recommended temperature profile of a belt-fed convection oven is
shown in Figure 13.
Stacking and Contact Pressure
Recommendations
When applications require the stacking of Littelfuse CA discs or when
electrical connection is made by pressure contacts, the minimum pres-
sure applied to the disc electrode surface should be 2.2kGs (5 pounds).
The maximum recommended pressure applied to the disc electrode is
dependent upon diameter size and is given in the following table.
MODEL
NUMBER
SIZE
(mm)
TYPICAL DISC
WEIGHT (GRAMS)
V131CA32
V131CA40
32
40
9
21
V151CA32
V151CA40
32
40
11
23
V251CA32
V251CA40
V251CA60
32
40
60
8
17
39
V271CA32
V271CA40
V271CA60
32
40
60
10
18
42
V321CA32
32
11
V321CA40
40
22
V321CA60
60
50
V421CA32
32
15
V421CA40
40
28
V421CA60
60
66
V481CA32
32
16
V481CA40
40
31
V481CA60
60
71
V511CA32
32
18
V511CA40
40
35
V511CA60
60
80
V571CA32
32
20
V571CA40
40
38
V571CA60
60
88
V661CA32
32
23
V661CA40
40
44
V661CA60
60
101
V751CA32
32
26
V751CA40
40
51
V751CA60
60
116
V881CA60
60
141
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
60
60
60
60
60
60
178
220
265
317
377
450
250
200
150
100
50
0
0
100
200
300
400
500
600
700
800
900
TIME (SEC)
FIGURE 13. TYPICAL BELT OVEN TEMPERATURE PROFILE
MODEL SIZE (mm)
MAXIMUM PRESSURE
32
16N/CM2 (23LBs/IN2)
40
8N/CM2 (11.5LBs/IN2)
60
4N/CM2 (5.7LBs/IN2)


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