41
40
Motor protection selection table
The three-element motor protection solution consists Ex9M circuit breaker, Ex9C contactor and Ex9R thermal relay. The solution provides
protection and type 2 coordination for the direct start of three-phase squirrel-cage asynchronous motor. See the table below for recommended
selection:
Switch disconnector
Ex9M SD switch disconnector is an accessory derived from corresponding Ex9M circuit breaker,
with the same outline dimensions, specifications and installation method. The maximum rated
operating voltage of the switch is AC 690V and DC 1000V.
Ex9M SD switch disconnector can disconnect load current and provide energy release protection
function.
The product provides the following functions and features:
Disconnecting function;
Mechanical reliable position indication;
Sufficient space between contacts when they are closed, otherwise the padlock cannot be mounted;
No leakage current;
Overvoltage resistance between incoming line and outgoing line.
Protection provided by switch disconnector
A coordination device must be installed at the power supply side of Ex9M SD disconnecting
switch to prevent the switch from being damaged in case of short circuit. The Ex9M SD
disconnecting switch provides energy release function which means it has a certain level of self-
protection capability.
Normally, an Ex9M SD disconnecting switch is installed before and after the Ex9M circuit
breaker, with the aim to isolate the Ex9M from the power and create an obvious disconnecting
point for easy service.
Switch symbol:
Motor control
cabinet
Secondary
power
distribution
cabinet
Main power
distribution
cabinet
Main incoming
line
Application figure
Terminal power
distribution cabinet
Disconnecting
switch function
Circuit breaker
function
M
Ex9M SD
Ex9M SD
Ex9M
Ex9M
Ex9M M
Motor
Circuit breaker
Contactor
Thermal relay
Power kW
Rated operating voltage
380V
Ex9B
1)
Ex9M
2)
Ex9C
Ex9R
Current A
0.06
0.2
Ex9BM-N 3P M1
-
Ex9CS06
Ex9R12 0.25A
0.09
0.3
Ex9BM-N 3P M1
-
Ex9CS06
Ex9R12 0.4A
0.12
0.44
Ex9BM-N 3P M1
-
Ex9CS06
Ex9R12 0.63A
0.18
0.6
Ex9BM-N 3P M1
-
Ex9CS06
Ex9R12 0.63A
0.25
0.85
Ex9BM-N 3P M1
-
Ex9CS06
Ex9R12 1A
0.37
1.1
Ex9BM-N 3P M2
-
Ex9CS06
Ex9R12 1.6A
0.55
1.5
Ex9BM-N 3P M2
-
Ex9CS06
Ex9R12 1.6A
0.75
1.9
Ex9BM-N 3P M2
-
Ex9CS06
Ex9R12 2.5A
1.1
2.7
Ex9BM-N 3P M3
-
Ex9CS06
Ex9R12 4A
1.5
3.6
Ex9BM-N 3P M4
-
Ex9CS06
Ex9R12 4A
2.2
4.9
Ex9BM-N 3P M6
-
Ex9CS09
Ex9R12 6A
3
6.5
Ex9BM-N 3P M10
-
Ex9CS09
Ex9R12 8A
4
8.5
Ex9BM-N 3P M10
-
Ex9CS12
Ex9R12 10A
Ex9C12
Ex9R38 10A
5.5
11.5
Ex9BM-N 3P M16
Ex9M1S M 16 3P
Ex9C18
Ex9R38 13A
7.5
15.5
Ex9BM-N 3P M20
Ex9M1S M 20 3P
Ex9C25
Ex9R38 18A
11
22
Ex9BM-N 3P M32
Ex9M1S M 32 3P
Ex9C32
Ex9R38 24A
15
29
Ex9BM-N 3P M40
Ex9M1S M 40 3P
Ex9C40
Ex9R100 40A
18.5
35
Ex9BM-N 3P M50
Ex9M1S M 50 3P
Ex9C50
Ex9R100 50A
22
41
Ex9BM-N 3P M63
Ex9M1S M 63 3P
Ex9C50
Ex9R100 50A
30
55
-
Ex9M1S M 80 3P
Ex9C65
Ex9R100 65A
37
66
-
Ex9M1S M 100 3P
Ex9C80
Ex9R100 80A
45
80
-
Ex9M1S M 125 3P
Ex9C100
Ex9R100 100A
55
97
-
Ex9M2S M 160 3P
Ex9C115
Ex9R185 115A
75
132
-
Ex9M2S M 180 3P
Ex9C150
Ex9R185 150A
Ex9C185
Ex9R185 150A
90
160
-
Ex9M2S M 200 3P
Ex9C185
Ex9R185 185A
Ex9C225
Ex9R500 225A
110
195
-
Ex9M2S M 250 3P
Ex9C225
Ex9R500 225A
Ex9C265
Ex9R500 225A
132
230
-
Ex9M3S M 315 3P
Ex9C265
Ex9R500 300A
Ex9C300
Ex9R500 300A
150
264
-
Ex9M3S M 350 3P
Ex9C300
Ex9R500 300A
Ex9C400
Ex9R500 300A
160
280
-
Ex9M3S M 350 3P
Ex9C400
Ex9R500 300A
185
326
-
Ex9M3S M 400 3P
Ex9C400
Ex9R500 400A
Ex9C500
Ex9R500 400A
200
350
-
Ex9M4S M 500 3P
Ex9C500
Ex9R500 400A
220
387
-
Ex9M4S M 500 3P
Ex9C500
Ex9R500 400A
Note:
1)
The available breaking indicators for Ex9B series are N: 6kA, H: 10kA;
2)
The available breaking indicators for Ex9M series are S: 36kA, N: 50kA, Q: 70kA, H: 100kA, P: 150kA.
In addition, select either Ex9B or Ex9M for 5.5kW-22kW circuit breaker according to actual application.
Functions
Functions