WP-S Datasheet, PDF (1/4 Pages) Welwyn Components Limited – Compact Flameproof Power Wirewound Resistors

Compact Flameproof Power
Wirewound Resistors
Welwyn Components
WP-S Series
• Small size for power rating
• Enhanced pulse handling capability
• Flameproof protection
• SMD Z-form available
• RoHS compliant with Pb-free terminations
Electrical Data
Power rating at 25°C
5s overload rating at 25ºC
Short pulse performance
Resistance range
Limiting element voltage
TCR
Isolation Voltage
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
Physical Data
watts
watts
ohms
volts
ppm/°C
volts
%
WP1S
WP2S
WP25S
WP3S
WP4S
WP5S
WP7S
1
2
2.5
3
4
5
7
5
10
12.5
15
20
25
35
See Pulse Performance graphs
R068 to 430R R05 to 900R R05 to 900R R01 to 2K2 R01 to 10K R015 to 6K8 R15 to 10K
50
50
75
100
100
150
150
<1R: 350
≥1R: 200
250
350
500
700
<20R: 5 ≥20R: 1, 2, 5
<R10: 5
<20R: 5 ≥20R: 1, 2, 5
≥R10: 1, 2, 5
E24 preferred
°C/watt
140
110
90
82
62
54
35
°C
-55 to +155
Dimensions (mm) & Weight (g)
Type
L max D max f min d nom PCB
Min
Wt.
mount bend
nom
D
centres radius
WP1S
6.2
2.8
21.20
0.6
10.20
0.6
0.22
WP2S
9.0
3.6
19.80
12.70
0.50
WP25S
12.5
4.5
17.80
18.40
0.50
WP3S
14.5
5.2
24.55
20.30
1.10
0.8
1.2
WP4S
13
5.6
22.75
18.90
1.00
d
WP5S
16.5
7.0
23.55
22.86
1.75
L
f
WP7S
25.0
8.8
28.30
31.40
4.40
Construction
A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive
element is wound on the substrate and welded to the caps. Flameproof silicone cement coating is applied prior to marking with
indelible ink. The components are then leadformed if required and packed.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue E · 07.06