Tubular Vitreous Enamelled Wirewound Resistors - TT electronics ...

Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
1600/1900 Series
Impervious Impervious lead lead free free vitreous vitreous enamel enamel coating coating
· Can be supplied with fixed, adjustable, tapped or
Can be supplied with fixed, adjustable,
low inductance winding
tapped or low inductance winding
· Seven termination styles with choice of
Seven mounting termination arrangements styles with choice of
· mounting Manufactured arrangements RoHS compliant Pb-free terminations*
Manufactured RoHS compliant
* Check Pb-free status terminations*
of stock when ordering
* Check status of stock when ordering
General Information
Vitreous enamelled wirewound resistors are capable of
withstanding a higher dissipation size for size, than any other
protected type; this is attributable to the higher operating
temperature which the wire and enamel can withstand.
Vitreous enamel provides exceptionally good protection to the
wire element and is essentially impervious to moisture. The
resistors can safely be used in harsh environmental conditions.
The Welwyn range is based on thirteen sizes of tube, each of
which has a recommended maximum dissipation which limits
operating surface temperature to a maximum of 375°C.
The stability and high reliability of Welwyn tubular vitreous
resistors is a direct result of the best quality materials being
used in their construction.
High purity ceramic tubes have been matched with nickel
Electrical Data
Values
chromium resistance wires and specially formulated enamel to
ensure that the resistors can withstand repeated heat cycling
without damage.
Connections between the resistance element and end
terminations are welded; other connections are brazed.
Mounting devices are available which permit resistors to be
mounted by both ends or by one end. Single ended mounting
is recommended for applications which do not subject the
resistor to shock or vibration.
Ferrules and the F type mounting plug are anchored into the
tubes with high temperature adhesive.
Special requirements, for types or styles not described
in this brochure, will be considered for economic
quantities.
1601 1905 1600 1602 1906 1603 1604
C°07 ta gnitar rewoP
sttaw 1 5.61
71 2 52 53
egnar ecnatsiseR
smho
1elbaT eS
egatlov tnemele gnitimiL stlov
1elbaT eS
)C° 02+ ot 5-( RCT C°/mpp

Tubular Tubular Vitreous Vitreous Enamelled
Enamelled
Enamelled
Wirewound Wirewound Resistors
Resistors
1600/1900 1600/1900 Series
Series
Welwyn Welwyn Components
Components
Electrical Electrical
Data (continued)
Data (continued)
Table
Table
1
1
*Dissipation (watts) to Resistance range (ohms) Limiting Low inductance
*Dissipation
*Dissipation
(watts)
(watts)
to
to
Resistance
Resistance
range
range
(ohms)
(ohms)
Limiting
Limiting
Low
Low
inductance
inductance
produce operating element winding resistance
produce
produce
operating
operating
element
element
winding
winding
resistance
resistance
hotspot temperature (°C) of: voltage range (ohms)
hotspot
hotspot
temperature
temperature
(°C)
(°C)
of:
of:
voltage
voltage
range
range
(ohms)
(ohms)
Ambient = 20°C Ambient Minimum Termination Min. res. at
Ambient
Ambient
= 20°C
20°C
Ambient
Ambient
Minimum
Minimum
Termination
Termination
Min.
Min.
res.
res.
at
at
= 70°C resistance at style
= 70°C
70°C
resistance
resistance
at
at
style
style
Max. at
Max. at
Max.
Max.
at
at
Max.
Max.
at
at
Type
any
either
Type
Type
any
any
either
either
200 300 375 375 ±5% ±2% ±1% tolerance C All others ±10% ±5% tolerance
200
200
300
300
375
375
375
375
±5%
±5%
±2%
±2%
±1%
±1%
tolerance
tolerance
C All
All
others
others
±10%
±10%
±5%
±5%
tolerance
tolerance
1601 5 10 14 11 1 15 25 15k 250 150 10 50 1.3k
1601
1601
5 10
10
14
14
11
11
1 15
15
25
25
15k
15k
250
250
150
150
10
10
50
50
1.3k
1.3k
1905 7 14.5 20 16 1 15 30 30k - 450 10 50 3.5k
1905
1905
7 14.5
14.5
20
20
16
16
1 15
15
30
30
30k
30k
- 450
450
10
10
50
50
3.5k
3.5k
1600 7.5 15 21 16.5 1 15 30 56k - 600 10 50 5.0k
1600
1600
7.5
7.5
15
15
21
21
16.5
16.5
1 15
15
30
30
56k
56k
- 600
600
10
10
50
50
5.0k
5.0k
1602 8 15.5 22 17 1 20 25 43k 500 350 10 50 4.0k
1602
1602
8 15.5
15.5
22
22
17
17
1 20
20
25
25
43k
43k
500
500
350
350
10
10
50
50
4.0k
4.0k
1906 9.5 19 28 22 1 20 30 50k 700 550 10 50 5.5k
1906
1906
9.5
9.5
19
19
28
28
22
22
1 20
20
30
30
50k
50k
700
700
550
550
10
10
50
50
5.5k
5.5k
1603 11 22 32 25 1 20 30 83k 850 750 10 50 7.5k
1603
1603
11
11
22
22
32
32
25
25
1 20
20
30
30
83k
83k
850
850
750
750
10
10
50
50
7.5k
7.5k
1604 15.5 31 45 35 1 20 60 100k 1300 1000 15 50 11.5k
1604
1604
15.5
15.5
31
31
45
45
35
35
1 20
20
60
60
100k
100k
1300
1300
1000
1000
15
15
50
50
11.5k
11.5k
1605 21 41 59 47 1 30 40 100k 1100 900 15 50 14k
1605
1605
21
21
41
41
59
59
47
47
1 30
30
40
40
100k
100k
1100
1100
900
900
15
15
50
50
14k
14k
1908 24 47 68 54 1 30 40 100k 1200 1000 10 50 16k
1908
1908
24
24
47
47
68
68
54
54
1 30
30
40
40
100k
100k
1200
1200
1000
1000
10
10
50
50
16k
16k
1607 34 66 95 76 1 30 50 100k 1300 900 15 50 22k
1607
1607
34
34
66
66
95
95
76
76
1 30
30
50
50
100k
100k
1300
1300
900
900
15
15
50
50
22k
22k
1606 41 80 115 91 1 30 40 160k 2100 1900 15 50 32k
1606
1606
41
41
80
80
115
115
91
91
1 30
30
40
40
160k
160k
2100
2100
1900
1900
15
15
50
50
32k
32k
1608 52 101 145 115 1 30 50 180k 2100 1800 20 50 38k
1608
1608
52
52
101
101
145
145
115
115
1 30
30
50
50
180k
180k
2100
2100
1800
1800
20
20
50
50
38k
38k
1609 74 145 208 165 1 35 50 250k 3000 2500 30 100 58k
1609
1609
74
74
145
145
208
208
165
165
1 35
35
50
50
250k
250k
3000
3000
2500
2500
30
30
100
100
58k
58k
*The
*The
stated stated
dissipation dissipation
applies applies
to to
resistors resistors
mounted mounted
horizontally horizontally
with with
unobstructed unobstructed
bore.
bore.
Performance Performance
Data
Data
Max
Typ
Max
Max
Typ
Typ
Load : 1000 hours at 70°C ∆R% 5.0 3.5
Load
Load
: 1000
1000
hours
hours
at
at
70°C
70°C
∆R%
∆R%
5.0
5.0
3.5
3.5
Shelf life : 12 months at room temperature ∆R% 1.0 0.1
Shelf
Shelf
life
life
: 12
12
months
months
at
at
room
room
temperature
temperature
∆R%
∆R%
1.0
1.0
0.1
0.1
Climatic ∆R% 0.5 0.35
Climatic
Climatic
∆R%
∆R%
0.5
0.5
0.35
0.35
Long term damp heat ∆R% 0.2 0.05
Long
Long
term
term
damp
damp
heat
heat
∆R%
∆R%
0.2
0.2
0.05
0.05
Bump and vibration ∆R% 0.1 0.02
Bump
Bump
and
and
vibration
vibration
∆R%
∆R%
0.1
0.1
0.02
0.02
Noise (in a decade of frequency) ∆R% zero zero
Noise
Noise
(in
(in
a decade
decade
of
of
frequency)
frequency)
∆R%
∆R%
zero
zero
zero
zero
Pulse Handling Data
Available by request
Pulse
Pulse
Handling
Handling
Data
Data
Available
Available
by
by
request
request
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
© All Welwyn information Components is subject to TT Limited electronics’
Bedlington,
own data and
Northumberland
is considered accurate
NE22 7AA,
at time
UK
of going to print.
© www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Welwyn
Welwyn
Components
Components
Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: Limited+44 Bedlington, (0) 1670 Northumberland 829465 · Email: info@welwyn-tt.com NE22 7AA, UK · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: © TT electronics +44 (0) 1670 plc822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
122
122
08. 11
122

Tubular Vitreous Enamelled
Wirewound Resistors
Tubular Vitreous Enamelled
Wirewound Resistors
Tubular Vitreous Enamelled
1600/1900 Series
Wirewound Resistors
1600/1900 Series
1600/1900 Series
Physical Data
Table 2 Dimensions in millimetres. See fig 2-8 for styles
Physical Data
Welwyn Components
Welwyn Components
A B C D E F G H J K
Table 2 Dimensions in millimetres. See fig 2-8 for styles
Type max max max nom max max nom ±.25 max
1601 33.0 A 17.5 B 8.2 C 4.5 D 5.0 E 19.5 F 15 G 3.0 H M3 J 59 K
Type 1905 56.1 max 14.5 max 6.55 max nom 4.5 max 5.0 17.5 max nom 10 ±.25 3.0 M3 max -
1601 1600 33.0 61.5 17.5 14.5 6.55 8.2 4.5 5.0 19.5 17.5 15 10 3.0 M3 59 -
1905 1602 56.1 51.0 14.5 17.5 6.55 8.2 4.5 5.0 17.5 19.5 10 15 3.0 M3 77 -
1600 1906 61.5 64.3 14.5 17.5 6.55 8.2 4.5 5.0 17.5 19.5 10 15 3.0 M3 90 -
1602 1603 51.0 74.5 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 101 77
1906 1604 64.3 102 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 128 90
1603
1605
74.5
89.5
17.5
24.0 13.2
8.2 4.5
5.7
5.0
6.8
19.5
26.5
15
17
3.0
4.0
M3
M4
101
122
1604
1908
102
102
17.5
24.0
8.2
13.2
4.5
5.7
5.0
6.8
19.5
26.5
15
17
3.0
4.0
M3
M4
128
134
1605
1607
89.5
102
24.0
32.0
13.2
19.2
5.7
7.0
6.8
9.8
26.5
32.0
17
22
4.0
6.4
M4
M6
122
134
1908
1606
102
166
24.0
24.0
13.2
13.2
5.7
5.7
6.8
6.8
26.5
26.5
17
17
4.0
4.0
M4
M4
134
198
1607 102 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 134
1608 152 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 184
1606 166 24.0 13.2 5.7 6.8 26.5 17 4.0 M4 198
1609 216 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 248
1608 152 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 184
1609 216 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 248
Terminations
Terminations
Styles B, 4B, AP and AW are available in all 13 tube sizes.
Styles B, 4B, AP and AW are available in all 13 tube sizes.
Styles C, CB and CP are available in sizes 1601 to 1609
Styles C, CB and CP are available in sizes 1601 to 1609
inclusive, 1906 and 1908
inclusive, 1906 and 1908
Lugs Lugs (Figure (Figure 2): 2): Pb Pb free free solder solder coated coated nickel nickel iron. iron. Denoted Denoted
by prefix B to to size reference, thus B1602
Pigtails (Figure 3): 14/.193 mm copper, 150 mm minimum
length. Denoted by prefix AP, thus AP1602
Rigid wires (Figure 4): 1.2 mm diameter tinned copper, 32
mm minimum length.
Denoted by prefix AW, thus: AW1602
Lugs with screws, nuts and washers (Figure 5): Nickel
plated brass screws and nuts. Denoted by prefix 4B,
thus: 4B1602.
Ferrule, electrically isolated (Figure 6) Connection to
Ferrule, electrically isolated (Figure 6) Connection to
resistor via Pb free solder coated nickle iron lugs. Denoted
resistor via Pb free solder coated nickle iron lugs. Denoted
by prefix CB, thus: CB1602.
by prefix CB, thus: CB1602.
Ferrule,
Ferrule,
electrically
electrically
live
live
(Figure
(Figure
7)
7)
Nickel
Nickel
plated
plated
brass.
brass.
Denoted by by prefix C, C, thus: C1602.
Ferrule, electrically isolated (Figure 8): Connection to
resistor via pigtails of 14/.193 mm copper, 150mm
minimum length. Denoted by prefix CP thus: CP1602
Marking The resistors are legend marked with type
reference, resistance value, tolerance and manufacturing
date code. Value marking conforms to IEC 62.
Solvent resistance: The vitreous coating and marking are
resistant to all accepted industrial cleaning fluids.
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
General © Welwyn Note Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
TT Telephone: electronics +44 reserves (0) 1670 the 822181 right to · make Facsimile: changes +44 in (0) product 1670 829465 specification · Email: without info@welwyn-tt.com notice or liability. · Website: www.welwyn-tt.com
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
08. 11
123
123

124
124
124
Tubular Vitreous Enamelled
Tubular
Tubular Vitreous
Vitreous Enamelled
Enamelled
Wirewound Resistors
Wirewound Resistors
Tubular Vitreous Enamelled
Wirewound Wirewound Resistors Resistors
Welwyn Components
Welwyn Components
Welwyn Components
1600/1900 Series
1600/1900 Series
1600/1900 Series
Adjustable Resistors (see Figure 9)
partial open winding necessitates a reduced maximum
Adjustable resistors Resistors use the (see same Figure basic 9) construction as fixed partial resistance, open when winding compared necessitates with fixed a reduced resistors, maximum and the
Adjustable Resistors (see Figure 9)
partial open winding necessitates a reduced maximum
Adjustable resistors already resistors described, use the and same have basic a window construction in the as vitreous fixed resistance, range when is compared also defined with in fixed Table resistors, 4.
and the
Adjustable resistors use the same basic construction as fixed resistance, when compared with fixed resistors, and the
resistors enamel through already described, which contact and is have made a window to the resistive in the vitreous resistance resistors already described, and have a window in the vitreous resistance
More than
range range
one adjusting
is also defined is also defined
band can
in Table in Table
be fitted,
4.
4.
up to the
enamel element through by a sliding which contact contact band. is made The band to the is resistive fitted with a More maximum than number one adjusting specified band in Table can be 3. fitted, up to the
enamel
element through which contact is made to the resistive
clamping by screw a sliding and nut contact to retain band. it The firmly band in position. is fitted with a More
maximum than one adjusting band can be fitted, up to the
element by a sliding contact band. The band is fitted with a maximum
Adjustable
number number
resistors
specified specified
are available
in Table in Table
in termination
3.
3.
styles B, 4B,
clamping clamping
The adjustable
screw screw
winding
and nut and nut
style
to retain to retain
has a
it it
maximum
firmly in position.
firmly in position.
permissible hot Adjustable AP, C, CB and resistors CP, in are sizes available 1602 to in 1609 termination inclusive styles and B, 1906 4B,
The spot adjustable temperature winding of 300°C style and has the a maximum permissible dissipation, hot for
Adjustable
AP, resistors are available in termination styles B, 4B,
and C, 1908 CB and denoted CP, in by sizes prefix 1602 ‘V’. to 1609 inclusive and 1906
The
spot adjustable winding style has a maximum permissible hot
an ambient temperature temperature of 300°C of 20°C, and the is maximum specified in dissipation, Table 4. The for AP,
and C, 1908
CB and denoted
CP, in by
sizes prefix
1602 ‘V’.
to 1609 inclusive and 1906
spot
an ambient temperature
temperature of 300°C
of 20°C, and the
is maximum
specified in dissipation,
Table 4. The
for and 1908 denoted by prefix ‘V’.
an ambient temperature of 20°C, is specified in Table 4. The
Table 3
Table 3
Table Tube A mm B mm Hole C Max. no of
Tube size A max. mm B max. mm dia. Hole mm C Max. adjusting no of
Tube
size A
max. mm B
max. mm
dia. Hole
mm C Max.
adjusting
no of
bands
size max. max. dia. mm adjusting
1602
bands
bands
1602 1603 20 27 3.2 1
1602
1603 1906
20 27 3.2 1
1603 20 27 3.2 1
1906 1604
1906
1604 1605 20 27 3.2 3
1604
1605 1908 20 25 27 32 3.2 3.7 32
1605 20 27 3.2 3
1908 1606 25 32 3.7 24
1908 25 32 3.7 2
1606 1607 25 30 32 38 3.7 42
1606 25 32 3.7 4
1607 1608 30 38 3.7 23
1607 30 38 3.7 2
1608 1609 30 38 3.7 35
1608 30 38 3.7 3
1609 30 38 3.7 5
1609 30 38 3.7 5
Table 4
Table 4
Table Max. dissipation in
Resistance range (ohms)
20°C Max. ambient dissipation (watts) in
Resistance range (ohms)
Type
20°C Max.
ambient dissipation
(watts)
in
Resistance range (ohms)
Min. for Min. for Max. for
Type
20°C ambient (watts)
Min. for Min. for Max. for
Type
200°C 300°C styles VC, all other all styles
200°C 300°C styles Min. for
VC, all Min.
other for Max.
all styles
for
hot spot hot spot VCP styles
hot 200°C
spot hot 300°C
spot styles
VCP VC, all
styles
other all styles
1602 8 15.5 4 3 1.6k
hot spot hot spot VCP styles
1602 1906 9.5 8 15.5 19 4 3 2.5k 1.6k
1602 8 15.5 1.6k
1906 1603 9.5 11 19 22 46 36 2.5k 3.0k
1906 9.5 19 4 3 2.5k
1603 1604 11 16 22 31 68 68 3.0k 5.3k
1603 11 22 6 6 3.0k
1604 1605 16 21 31 41 86 86 5.3k 4.5k
1604 16 31 8 8 5.3k
1605 1908 21 24 41 47 11 6 10 6 4.5k 7.5k
1605 21 41 6 6 4.5k
1908 1607 24 34 47 66 11 10 9 7.5k 8.1k
1908 24 47 11 10 7.5k
1607 1606 34 41 66 80 11 14 13 9 13.2k 8.1k
1607 34 66 11 9 8.1k
1606 1608 41 52 101 80 14 17 13 16 13.2k 15.4k
1606 41 80 14 13 13.2k
1608 1609 52 74 101 145 17 25 16 24 15.4k 25.5k
1608 52 101 17 16 15.4k
1609 74 145 25 24 25.5k
1609 74 145 25 24 25.5k
Manufactured Values
Manufactured E24 preferred Values
Manufactured E24 preferred
Values
E24 preferred
Standard Selection Tolerance ±10%
Standard All other details Selection of the electrical Tolerance and environmental ±10%
Standard All other details Selection of the electrical Tolerance and environmental
±10%
performance of adjustable resistors are the same as for
All
performance other details
of adjustable of the electrical
resistors and
are environmental
fixed resistors.
the same as for
performance
fixed resistors.
of adjustable resistors are the same as for
fixed resistors.
General Note
TT © electronics Welwyn reserves Components the right to Limited make changes Bedlington, product Northumberland specification without NE22 7AA, notice UKor liability.
All © Telephone: information Welwyn +44 Components is (0) subject 1670 to 822181 TT electronics’ Limited · Facsimile: own Bedlington,
+44 data (0) and 1670
Northumberland is considered 829465 · Email: accurate NE22
info@welwyn-tt.com at 7AA, time UK of going to · Website: print. www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Telephone: Welwyn +44 Components (0) 1670 822181 Limited · Facsimile:
Bedlington,
Bedlington, +44 (0) 1670
Northumberland
Northumberland 829465 · Email:
NE22
NE22 info@welwyn-tt.com
7AA,
7AA,
UK
UK · Website: www.welwyn-tt.com
© Telephone:
Telephone: TT electronics +44
+44
(0)
(0)
1670
1670 plc822181 ·
Facsimile:
Facsimile:
+44
+44
(0)
(0)
1670
1670
829465
829465 ·
Email:
Email:
info@welwyn-tt.com
info@welwyn-tt.com ·
Website:
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www.welwyn-tt.com
08. 11

Tubular Vitreous Enamelled
Wirewound Resistors
Tubular Vitreous Enamelled
Wirewound Resistors
1600/1900 Series
1600/1900 Series
Welwyn Components
Tapped Resistors See Figure 10
Fixed resistors can be supplied with taps to special order.
Because of the reduced winding length, the total resistance of
a tapped resistor will be less than can be offered on a fixed
resistor of the same size. The reduction is proportional to the
number of taps and Table 5 is intended as a guide.
The minimum resistance per section on all sizes is 1Ω and the
standard selection tolerance for any section is ±10%
Ordering Procedure
Enquiries for tapped resistors must state the following details:
Resistance per section
Maximum dissipation per section
Maximum operating ambient temperature
Maximum permissible dimensions if important
Type of terminations required. (See ‘Terminations’, page 3)
Resistor style or proposed method of mounting.
Table 5
Maximum* Maximum* Maximum*
total resistance number
dissipation with single of taps
in 20°C
tap
ambient
(ohms)
(watts) with
Type
single tap
1905 14.5 9k 1
1600 15.0 12k 1
1602 15.5 9k 1
1906 19.0 13k 1
1603 22 18k 1
1604 31 29k 2
1605 41 34k 2
1908 47 38k 2
1607 66 53k 2
1606 80 78k 4
1608 101 93k 4
1609 145 140k 4
*Maximum total dissipation assumes that this will be
evenly spread over the total element length.
Low Inductance Resistors
Ayrton-Perry wound elements are supplied for low inductance
applications. This winding style has a maximum permissible
hot spot temperature of 300°C. The maximum dissipation is
defined in Table 1 under the heading Operating hot spot
temperature of 300°C, and resistance ranges are defined in
the three right-hand columns of this table.
Application Notes
When cold, vitreous enamel has excellent insulation resistance.
In common with all insulants the specific resistance of the
enamel decreases with increased temperature; therefore, if
operated at any temperature approaching the maximum, the
resistor cannot be classed as an insulated type and should not
be used in contact with any conducting materials.
The recommended dissipations for each of the resistor hot
spot temperatures applies to resistors mounted horizontally. If
the bore is completely blocked a 15% derating is
recommended. However, wherever possible, resistors should
be mounted vertically with unobstructed bore.
This makes best use of the chimney effect of the heated tube
and will encourage a cooling stream of air through the bore.
Allowances must be made, when tubular resistors are mounted
in banks, for the effects produced by radiation between tubes.
Appreciable reduction of hot spot temperature can be
achieved by arranging that resistors are subjected to some
measure of forced draught. In general, it is most efficient to
extract air from the resistor enclosure and arrange that an air
inlet is adjacent to the bottom of the tubes.
If soft soldered connections are used the resistors should be derated
where applicable to limit the hot spot temperature to 300°C.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
© Telephone: TT electronics +44 (0) 1670 plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08. 11
123

Tubular Vitreous Enamelled
Wirewound Resistors
Tubular Vitreous Enamelled
Wirewound Resistors Resistors
1600/1900
1600/1900
1600/1900 Series
Series
Series
Welwyn
Welwyn Components
Components
126
126
126
Table
Table
Table 6
mounting
mounting
mounting
clip
clip
clip
dimension
dimension
dimension
(mm)
(mm)
(mm) See Fig. 11
See
See
Fig.
Fig.
11
11
Clip Type A B C D E F G H J K Auxiliary
Clip Type Auxiliary
Clip ref. Type type nom. A max B nom. C max D max E max F ±0.2 G dia H dia J nom K Auxiliary locking
ref. type nom. max nom. max max max ±0.2 dia dia nom locking
ref. type nom. max nom. max max max ±0.2 dia dia nom spring locking ref
spring ref
1601 52 68
spring ref
1601 52 68
1601 1602 52 70 68 86
1602 70 86
MD1 1603 1602 90 70 106 86 29 19 17.5 14.5 4.8 4.0 3.9 7.2 MD16
MD1 1603 90 106 29 19 17.5 14.5 4.8 4.0 3.9 7.2 MD16
MD1 MD4 1603 1604 121 90 106 137 29 19 17.5 14.5 4.8 4.0 3.9 7.2 MD16
MD4 1604 121 137
MD4 1604 1605 121 108 137 128
1605 108 128
1605 1906 108 83 128 99
1906 83 99
1906 1607 125 83 146 99
1607 125 146
MD3 1607 1608 125 176 146 197 49 33 32.0 19.0 6.4 4.0 6.3 9.5 MD18
MD3 1608 176 197 49 33 32.0 19.0 6.4 4.0 6.3 9.5 MD18
MD3 MD6 1608 1609 176 240 197 261 49 33 32.0 19.0 6.4 4.0 6.3 9.5 MD18
MD6 1609 240 261
MD6 1609 240 261
These mounting clips are suitable for termination styles C, CB and CP.
These
These
mounting
mounting
clips
clips
are
are
suitable
suitable
for
for
termination
termination
styles
styles
C,
C,
CB
CB
and
and
CP.
CP.
MD4, 5 and 6 have an ear formed in the bottom surface of the bracket to
MD4,
MD4, and
and have
have
an
an
ear
ear
formed
formed
in
in
the
the
bottom
bottom
surface
surface
of
of
the
the
bracket
bracket
to
to
prevent rotation of the mounting plate. The auxiliary locking springs
prevent
prevent
rotation
rotation
of
of
the
the
mounting
mounting
plate.
plate.
The
The
auxiliary
auxiliary
locking
locking
springs
springs
ensure positive retention of the tube under severe mechanical shock
ensure
ensure
positive
positive
retention
retention
of
of
the
the
tube
tube
under
under
severe
severe
mechanical
mechanical
shock
shock
conditions. See Figure 11.
conditions.
conditions.
See
See
Figure
Figure
11.
11.
Table
Table
Table 7
Mounting
Mounting
Mounting
brackets
brackets
brackets
dimensions
dimensions
dimensions
(mm).
(mm).
(mm). See Fig. 12.
See
See
Fig.
Fig.
12.
12.
Bracket Type A B C D E
Bracket Type Bracket ref. Type nom A nom B nom C nom D nom E
ref. nom nom nom nom nom
ref. MD40 1600 nom 78 nom 92 nom 10 nom 20 nom 4.2
MD40 1600 78 92 10 20 4.2
MD40 1600 1905 78 73 92 87 10 20 4.2
1905 73 87
1905 1601 73 50 87 64
1601 50 64
1601 1602 50 68 64 82
1602 68 82
MD41 1602 1603 68 91 105 82 13 20 4.2
MD41 1603 91 105 13 20 4.2
MD41 1603 1604 119 91 105 133 13 20 4.2
1604 119 133
1604 1906 119 81 133 95
1906 81 95
MD42 1906 1605 106 81 120 95
MD42 1605 106 120
MD42 1605 1606 106 183 120 197 20 25 5.2
1606 183 197 20 25 5.2
1606 1908 183 119 197 133 20 25 5.2
1908 119 133
1908 1607 119 121 133 143
1607 121 143
MD43 1607 1608 121 171 143 193 28 30 5.2
MD43 1608 171 193 28 30 5.2
MD43 1608 1609 171 235 193 257 28 30 5.2
1609 235 257
1609 235 257
These brackets are suitable for termination styles B, 4B, AP & AW
These
These
brackets
brackets
are
are
suitable
suitable
for
for
termination
termination
styles
styles
B,
B,
4B,
4B,
AP
AP AW
AW
Table
Table
Table 8
Mounting
Mounting
Mounting
plug
plug
plug
dimensions
dimensions
dimensions
(mm)
(mm)
(mm) See Fig. 13.
See
See
Fig.
Fig.
13.
13.
Type A B C
Type Type A Min. B Max.
C
Min.
Max.
1601
Min.
Max.
1601
1601 1602
1602
1602 1603 1.6 3.7 5.3 M4
1603 1.6 3.7 5.3 M4
1603 1604
1.6 3.7 5.3 M4
1604
1906 1604
1906
1906 1605
1605
1605 1606 1.6 3.7 5.3 M5
1606 1.6 3.7 5.3 M5
1606 1908
1.6 3.7 5.3 M5
1908
1908 1607
1607
1607 1608 3.2 5.2 6.8 M6
1608 3.2 5.2 6.8 M6
1609 1608 3.2 5.2 6.8 M6
1609
1609
F type bushes are suitable for termination styles B, 4B AP and AW
type
type
bushes
bushes
are
are
suitable
suitable
for
for
termination
termination
styles
styles
B,
B,
4B
4B
AP
AP
and
and
AW
AW
Ordering
Ordering
Ordering
Procedure
Procedure
Procedure
Mounting clips (and auxiliary locking
Mounting
Mounting
clips
clips
(and
(and
auxiliary
auxiliary
locking
locking
springs when required) should be ordered
springs
springs
when
when
required)
required)
should
should
be
be
ordered
ordered
units and the type reference specified.
in
in
units
units
and
and
the
the
type
type
reference
reference
specified.
specified.
Ordering
Ordering
Ordering
Procedure
Procedure
Procedure
Mounting brackets should be ordered in
Mounting
Mounting
brackets
brackets
should
should
be
be
ordered
ordered
in
in
units and the type reference specified.
units
units
and
and
the
the
type
type
reference
reference
specified.
specified.
Ordering
Ordering
Ordering
Procedure
Procedure
Procedure
Mounting plugs are denoted by the prefix
Mounting
Mounting
plugs
plugs
are
are
denoted
denoted
by
by
the
the
prefix
prefix
‘F’ added to the size reference;
‘F’
‘F’
added
added
to
to
the
the
size
size
reference;
reference;
e.g. BF1602 and APF1602.
e.g.
e.g.
BF1602
BF1602
and
and
APF1602.
APF1602.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All © information Welwyn Components is subject to TT electronics’ Limitedown Bedlington, data and Northumberland is considered accurate NE22 at 7AA, time UK of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Telephone: Welwyn
Welwyn +44 Components
Components (0) 1670 822181 Limited
Limited · Facsimile:
Bedlington,
Bedlington, +44 (0) 1670
Northumberland
Northumberland 829465 · Email:
NE22
NE22 info@welwyn-tt.com
7AA, UK
7AA, UK · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
© Telephone: TT electronics +44 (0) 1670 plc822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08. 11

Tubular Vitreous Enamelled
Wirewound Resistors
Tubular Vitreous Enamelled
Wirewound Resistors
1600/1900 Series
Welwyn Components
Ordering Procedure
Specify the full type reference, resistance value and tolerance, using IEC 62 code references.
The addition of L to the prefix describing terminal configuration indicates Ayrton-Perry winding.
Example: Electrically live ferrule terminated 1601 size at 10 ohms and 5% -
Adjustable Option
C 1601 - 10R J I
V
Fixed
Adjustable
Termination Style
B AP AW 4B CB C CP See Figures 2 to 8
Winding & Mounting Options
L
F
Standard
Low Inductabce
Mounting plug
Tube Size
Value (USE IEC62 code)
Tolerance (use IEC62 code)
F 1%
G 2%
J 5%
K 10%
Packing
I Box Standard
Note - consult data sheet in detail for valid combinations.
Minimium Ordering Quantity: 10
Order Multiple: 1
Note - adjustable option V with termination style 4B is coded 4VB
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: © TT electronics +44 (0) 1670 plc822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08. 11