Vishay sfernice, Adjustable wirewound enamelled resistors – C&H Technology RA User Manual
Page 3
RA
Adjustable Wirewound Enamelled Resistors
Vishay Sfernice
Document Number: 50019
For technical questions, contact: [email protected]
www.vishay.com
Revision: 21-Jun-06
68
MECHANICAL SPECIFICATIONS
Mechanical Protection
vitreous enamel
Resistive Element
Ni-Cr wire
Connections
B band
AN or CS collar
Average Unit Weight
40 to 415g
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits
- 55 °C + 350 °C
Climatic Category
- 55 °C/+ 200 °C/56 days
* 1 % of total resistance and 2 % between sliding collar and fixed connection.
ADMISSIBLE RATED AMPERAGE
This must in all cases be less than:
SLIDING COLLAR
Resistors are normally supplied with 1 sliding collar fi tted and locked in a specifi c position.
Additional collars can be supplied and adjusted at the factory to special order (on request).*
* Quote ohmic value and tolerance of each resistance section, and Rn value.
ELECTRICAL SPECIFICATIONS
Resistance Range
33 to 22K
(E6 series)
Tolerance
Standard
± 10 %
Power Rating
21 W to 180 W at 25 °C
Temperature Coeffi cient
+ 75 ppm/°C (typical)
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
TYPICAL VALUES AND DRIFTS
Short Time Overload
10 Pr 5 s
Voltage < 6000V
2 % or 0.05
0.5 %
Climatic sequence
- 55 °C
+ 200 °C
5 cycles
3 % or 0.05
Insulation resistance > 100M
1 %
Humidity
(Steady State)
56 days
95 % R.H.
2 % or 0.05
Insulation resistance > 100M
0.5 %
Thermal Shock
Load at Pr
followed by exposure at - 55°C/15
2 % or 0.05
0.5 %
Resistor Strength
200N ± 10N
2 % or 0.05
0.25 %
Vibration
55/10
1 %* or 0.05
0.5 %
Terminal Strength AN
B
Traction 40 Ncm
Torque 60 Ncm
1 % or 0.05
0.25 %
Load Life
1000 hours at Pr
25 °C
90 /30
5 %
1.5 %
SPECIAL FEATURES
RA STYLE
13 x 70
16 x 94
20 x 117
25 x 138
25 x 168
30 x 250
Designation NF C 93-214
RBA 13 x 70
-
RBA 20 x 117
-
RBA 25 x 168
-
Power Rating NF C 93-214
at 25 °C
13 W
-
25 W
-
50 W
-
Maximum Power
Rating at 25 °C
21 W
35 W
50 W
75 W
120 W
180 W
Ohmic Range
(E6, E24 series)
33
3.9K
68
3.9K
100
4.7K
150
6.8K
220
10K
330
22K
in
P rW
(
)
Rn
( )
-----------------
MAXIMUM ADDITIONAL COLLARS
MODEL
AND TYPE
RA
13 x 70
RA
16 x 94
RA
20 x 117
RA
25 x 138
RA
25 x 168
RA
30 x 250
Additional
sliding collar
1
1
1
2
3
4