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CE I CON
S TAR - DE LTA S TAR T E R S E L ECT I ON GU I DE
STAR-DELTA STARTERS
up to 69A
l
●
For example star-delta starter, motor rating 7.5kW at 380/415V AC3, contactor with 380/415V coil, enclosure with start/stop push buttons & integral
motor circuit switch: overload relay
55500/
MC
,
star-delta contactor
55300/0
J
,
enclosure
55011/
AD0
.
Dimensions – see pages 260–261 Specification – see pages 241–242 Alternative coils/timers – see page 181
Wiring diagrams – see page 245
55500/
MC
55300/0
J
55001/
AC0
55011/
AD0
Enclosures: C19-C30 are IP66, comprising Steel back box and Polycarbonate cover.
Overload relay
Star-delta contactor
Enclosure
Approx motor rating Full load
Coil
at 400/415V 3ph
current (A)
voltage
Push-button
kW HP
min–max LIST No
50
Hz
LIST No
arrangement LIST No
C19
110
V
55300/0
M
230
V
55300/0
B
400
V
55300/0
J
C22
110
V
56300/0
M
230
V
56300/0
B
400
V
56300/0
J
C30
110
V
57300/0
M
230
V
57300/0
B
400
V
57300/0
J
STAR-DELTA APPLICATION
For Star-delta units, the overload relay is connected in the delta loop and carries the motor winding current only in the delta mode.
For ease of selection the ratings shown in the table are the equivalent motor (nameplate) currents.
The overload relay scale is calibrated for direct-on line use and therefore its scale must be set to 0.58 times rated motor (nameplate) current.
Star-Delta units are fitted with an electronic timing relay with a minimum adjustment range from 3 to 45 seconds.
Timers have an additional built-in delay period between the ‘star’ contactor opening and the ‘delta’ contactor closing.
2.2
3
4.1-6.9
55500/
JC
4
5.5
6.5-10.9
55500/
KC
7.5
10
10.3-17.2
55500/
MC
11
15
16.5-27.6
55500/
NC
20
25
25.9-43.3
57500/
PC
22
30
25.8-43.1
57500/
PC
25
34
41.5-69
57500/
QC
Start & Stop
57001/
AC0
None
57001/
AC1
Reset only
57001/
AC2
Start & Stop
57011/
AD0
with
None
57011/
AD1
Motor Circuit
Reset only
57011/
AD2
Switch
Start & Stop
55001/
AC0
None
57001/
AC1
Reset only
57001/
AC2
Start & Stop
55011/
AD0
with
None
57011/
AD1
Motor Circuit
Reset only
57011/
AD2
Switch
1
Locate the kW, HP or Full Load Current of
the motor and select the overload relay.
2
Choose the contactor with the appropriate coil
voltage (alternative coils see page 181).
3
Choose the enclosure with the required pushbut-
tons (with or without MCS).