C&H Technology RA - 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