ms / md motor starting capacitors
tEchnical data
discharge resistors
A discharge resistor may be fitted to a
motor start capacitor to prevent electrical
overstress of the capacitor and or for safety
reasons. In accordance with BS5267 and
IEC 60252, the resistor value should be such
that it reduces the voltage on the capacitor,
from the line voltage to less than 50V within
60 secs.
The resistor value may be approximated as
follows:
T
R (kW) max. =
Rated capacitance µF
rated voltage
(d.c.)
120
220
260
280
330
t
50000
32000
30000
28000
26000
value (kohms)
5.6
15
33
56
82
100
wattage
2W
2W
0.5W
1W
2W
1W
Part numbEring
Pos 1–15
0
1
8
2
0
3
m
4
s
5
2
6
2
7
a
8
b
9
m
10
a
11
1
12
s
13
t
14
d
15
080
ms
22
ab
m
a
1
std
variants, Pos. 13-15
STD=standard design, all other codes are
customer specific.
terminal code, Pos. 12
1 = Double amp tag
2 = special variant
motor start
capacitance tolerance, Pos. 11
A = -0% +25%, K = ±10%
manufacturing style, Pos. 10
M = Moulded case
case code, Pos. 8-9
AA = 38x75, AB = 38x90, AC = 38 x 116
rated voltage (rms), Pos. 6-7
12 = 120Vac, 22 = 220Vac, 26 = 260Vac
type code, Pos. 4-5
MS = Motor start single rating
MD = Motor start dual rating
capacitance code, Pos. 1-3
080 = 80µF, 120 = 120µF
KEMET [ KEMET CORPORATION ]
