RoHS
Compliant
MS/MD Series 60/70°C
• Intermittent AC Motor Starting
• 6.3 mm Double amp tags (quick connect types)
• VDE approved to EN 60252-2
APPLICATION BASIC DESIGN
SPECIFICATION
Standards DIN EN 60252-2:- AC Motor Capacitors - Part 2 : Motor Start Capacitors
Capacitance range 25 µF to 750µF
Capacitance tolerance ±10% or -0% +25%
Rated voltage UR 120V - 330Vac 50Hz
Surge voltage US 1.25 x UR
Endurance life time
+70°C, 1.1UR MD types 500 hrs
(at specified duty cycle)
+60°C, 1.1UR MS types 500 hrs
(at specified duty cycle)
End of Life requirement:
ΔC/C < ±10%
cos ϕ < 0.2
Shelf Life 2 years
Temperature range -20°C to +70°C MD types
-20°C to +60°C MS types
Capacitors for this application are designed
for itermittent duty only, and capable ofitermittent duty only, and capable of
withstanding the a.c. voltage applied to
the motor during starting. The capacitor
construction comprise either double anode
A range of aluminium electrolytic capacitors
specifically designed for a.c. operation
which help to start the motor by providing a
leading current to the auxillary winding. The
capacitor is not permanently connected to
the winding of the motor and is switched off
after starting, usually automatically.
Dimensions mm
AA 38 39 75
AB 38 39 90
AC 38 39 116
Case Code D1 ±0.5 D2 ±0.5 Lmax
Rated Voltage 220V 260V
Capacitor type MD MD
Capacitance (µF) (note 1) (note 2)
VDE Approvals to EN 60252-2
30 AA
40 AA AB AB
50 AA AB AB
60 AA AB AB
70 AB AB
80 AB AC AB
90 AC
100 AC
120 AC
125 AC
Note 1: Duty cycles approved;
220V @ SD=3 & ED=1.7%
280V @ SD=1 & ED=0.55%
300V @ SD=1 & ED=0.1%
Note 2: Duty cycles approved;
260V @ SD=3 & ED=1.7%
330V @ SD=1 & ED=0.55%
General approval notes;
• valid for both ±10% and -0 +25% tolerance.
• valid for intermediate capacitance values in increments of 1µF
between 30µF and 100µF and in increments of 5µF between
100µF and 125µF.
or O-style (double anode and floating
cathode) windings and are housed in a
moulded plastic case. The MD series is VDE
approved to EN 60252-2 for the defined
ratings.
147
BHC and Evox Rifa Electrolytic Capacitors
---MS12AAMA1STD 25 325 -0% +25% 38x75 1.67%
---MS12AAMK1STD 25 360 ±10% 38x75 1.67%
---MS12ABMA1STD 85 460 -0% +25% 38x90 1.67%
---MS12ABMK1STD 90 510 ±10% 38x90 1.67%
---MS12ACMA1STD 120 670 -0% +25% 38x116 1.67%
---MS12ACMK1STD 130 750 ±10% 38x116 1.67%
---MD12AAMA1STD 25 325 -0% +25% 38x75 1.67% 0.55%
---MD12AAMK1STD 25 360 ±10% 38x75 1.67% 0.55%
---MD12ABMA1STD 85 460 -0% +25% 38x90 1.67% 0.55%
---MD12ABMK1STD 90 510 ±10% 38x90 1.67% 0.55%
---MD12ACMA1STD 120 670 -0% +25% 38x116 1.67% 0.55%
---MD12ACMK1STD 130 750 ±10% 38x116 1.67% 0.55%
---MS22AAMA1STD 30 65 -0% +25% 38x75 1.67%
---MS22AAMK1STD 30 70 ±10% 38x75 1.67%
---MS22ABMA1STD 40 90 -0% +25% 38x90 1.67%
---MS22ABMK1STD 40 100 ±10% 38x90 1.67%
---MS22ACMA1STD 55 130 -0% +25% 38x116 1.67%
---MS22ACMK1STD 65 150 ±10% 38x116 1.67%
---MD22AAMA1STD 30 65 -0% +25% 38x75 1.67% 0.55%
---MD22AAMK1STD 30 70 ±10% 38x75 1.67% 0.55%
---MD22ABMA1STD 40 90 -0% +25% 38x90 1.67% 0.55%
---MD22ABMK1STD 40 100 ±10% 38x90 1.67% 0.55%
---MD22ACMA1STD 55 130 -0% +25% 38x116 1.67% 0.55%
---MD22ACMK1STD 65 130 ±10% 38x116 1.67% 0.55%
---MS26AAMA1STD 25 55 -0% +25% 38x75 1.67%
---MS26AAMK1STD 25 60 ±10% 38x75 1.67%
---MS26ABMA1STD 35 75 -0% +25% 38x90 1.67%
---MS26ABMK1STD 35 85 ±10% 38x90 1.67%
---MS26ACMA1STD 50 110 -0% +25% 38x116 1.67%
---MS26ACMK1STD 55 125 ±10% 38x116 1.67%
---MD26AAMA1STD 25 50 -0% +25% 38x75 1.67% 0.55%
---MD26AAMK1STD 25 55 ±10% 38x75 1.67% 0.55%
---MD26ABMA1STD 30 70 -0% +25% 38x90 1.67% 0.55%
---MD26ABMK1STD 35 80 ±10% 38x90 1.67% 0.55%
---MD26ACMA1STD 45 100 -0% +25% 38x116 1.67% 0.55%
---MD26ACMK1STD 50 115 ±10% 38x116 1.67% 0.55%
MS / MD Motor Starting Capacitors
Type number Min. Cap. Max. Cap. Tolerance Can Size Duty Cycle
(µF) (µF) (mm) @ 120V rms @ 150V rms
Type number Min. Cap. Max. Cap. Tolerance Can Size Duty Cycle
(µF) (µF) (mm) @ 220V rms @ 280V rms
Type number Min. Cap. Max. Cap. Tolerance Can Size Duty Cycle
(µF) (µF) (mm) @ 260V rms @ 330V rms
120Vac
220Vac
260Vac
Capacitance code
e.g. 030=30µF, 120=120µF
*
TECHNICAL DATA
Dual Voltage Rating
The MD range of capacitors is designed
with a dual voltage rating. The lower voltage
rating relates to a duty cycle of 1.67% and
the upper voltage rating relates to a duty
cycle of 0.55%.
Power Factor
The tangent of the loss angle for motor start
capacitors shall not exceed 0.1 and shall be
calculated as follows:
Tan δ = W = true watts
V x I apparent watts
Duty Cycle
The standard rating is 1.67% or 1/60th full
time and corresponds to a maximum duty
of 20 starts, each of three seconds duration
per hour. It is expressed as 3/1.67 (a 3 minute
cycle with 1.67% duration during which the
capacitor may be energised). If the same
capacitor is to be used for a duty cycle of
60 starts per hour the cycle duration will
be 1 minute. The operation time per cycle
will then have to be reduced to 1.67% of 1
minute (i.e. 1 second). Alternative duty cycles
are available on request.
Presence of Run Capacitor
When the motor is fitted with both starting
and run capacitors, consideration should be
given to fitting of the appropriate discharge
resistor to the starting capacitor. This is
to protect the run capacitor from damage
through discharge of the starting capacitor.
Container Form
Cylindrical mouldings, meeting creepage
and clearance distances, according to IEC
60335-1 and flammability ratings according
to UL94-V1.
PART NUMBERING
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:
R (kW) max. = T
Rated capacitance µF
Pos 1–15
0 8 0 M S 2 2 A B M A 1 S T D
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
MOTOR START
080 MS 22 AB M A 1 STD
Terminal Code, Pos. 12
1 = Double amp tag
2 = special variant
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
Variants, Pos. 13-15
STD=standard design, all other codes are
customer specific.
Rated Voltage
(d.c.)
T
120 50000
220 32000
260 30000
280 28000
330 26000
Value (kOhms) Wattage
5.6 2W
15 2W
33 0.5W
56 1W
82 2W
100 1W
Statements of suitability for certain applications are based on our knowledge of typical operating conditions for such applications, but are not intended to constitute –
and we specifically disclaim – any warranty concerning suitability for a specific customer application or use. This Information is intended for use only by customers who
have the requisite experience and capability to determine the correct products for their application. Any technical advice inferred from this Information or otherwise
provided by us with reference to the use of our products is given gratis, and we assume no obligation or liability for the advice given or results obtained.
