General Catalogue 2007 - Ibemo Kazakhstan Ltd

Motor DOL starting Assisted start
rating conditions conditions
Up to 0.75kW 5 x FLC for 6 secs 2.5 x FLC for 15 secs
1.1 to 7.5 kW 6 x FLC for 10 secs 2.5 x FLC for 15 secs
11 to 75kW 7 x FLC for 10 secs 2.5 x FLC for 15 secs
90 to 160kW
Table 28
6 x FLC for 15 secs 2.5 x FLC for 20 secs
1 Phase 230V DOL Starting
Recommended circuit breaker
FLC (A) HN
kW hp A NBN NCN NDN Fuse(A)
0.18 0.25 2.8 16 10 10 10
0.25 0.33 3.2 16 10 10 16
0.37 0.5 3.5 16 10 10 16
0.55 0.75 4.8 20 16 16 16
0.75 1.0 6.2 25 20 20 20
1.1 1.5 8.7 40 25 25 25
1.5 2.0 11.8 50 32 32 32
2.2 3.0 17.5 - 50 50 40
3.0 4.0 20 - 63 63 50
3.75 5.0 24 - - - 63
5.5 7.5 36 - - - 80
7.5
Table 29
10 47 - - - 100
3 Phase 400V Assisted Starting Star-Delta
Recommended circuit breaker
FLC (A) (A) HRC
kW hp A NCN NDN fuse (A)
3 4 6.3 16 10 16
4 5.5 8.2 20 10 16
5.5 7.5 11.2 32 16 20
7.5 10 14.4 40 25 25
11 15 21 50 32 32
15 20 27 40 35
18.5 25 32 50 40
22 30 38 63 50
30 40 51 63
37 50 63 80
45 60 76 80
55 75 91 100
75 100 124 160
90 125 154 200
110 150 183 200
132 175 219 250
150 200 240 315
160
Table 30
220 257 315
3.44
Hager Catalogue 2007 • Technical
Device Selection For Motor Applications
Tables 28,29,30 and 31 give general recommendations for the
selection of circuit breakers and HRC fuses for the protection of
motor power circuits and are based on the assumptions shown in
Table 28 for a cage motor running at approximately 1400 Rev/Min.
Assisted Start
The selection of a feeder circuit breaker for a motor with an assisted
start facility is much the same as for DOL start. The full load running
current is the same for both, but the starting current for the assisted
start can be less than half, with a subsequent reduction in starting
torque. Typical starting current for star-delta start would be 2 to
21/2 times FLC, with a run-up time of 15 to 20 seconds depending
on the size of the motor and the load driven by the motor. However
the transient during changeover still has to be taken into account so
selection is often dictated by the instantaneous trip setting of the
circuit breaker.
3 Phase 400V DOL Starting
Recommended circuit breaker
FLC (A) (A) (A) HRC
kW hp A NBN NCN NDN fuse (A)
0.18 0.25 0.87 2 4
0.25 0.33 1.17 3 4
0.37 0.5 1.2 3 4
0.55 0.75 1.8 4 6
0.75 1.0 2.0 10 6 6 6
1.1 1.5 2.6 16 10 6 10
1.5 2.0 3.5 16 10 10 16
2.2 3.0 4.4 20 16 16 16
3.0 4.0 6.3 25 20 20 20
4.0 5.5 8.2 32 25 25 25
5.5 7.5 11.2 50 40 40 32
7.5 10 14.4 63 50 50 40
11 15 21 63
15 20 27 80
18.5 25 32 80
22 30 38 80
30 40 51 100
37 50 63 125
45 60 76 125
55 75 91 160
75 100 124 200
90 125 154 250
110 150 183 315
132 175 219 355
150 200 240 355
160
Table 31
220 257 355
ibemo Kazakhstan - 090301 Republic of Kazakhstan, West Kazakhstan Oblast, Aksai, Pramzone, BKKS office complex
Phone: +7 71133 93077 ; Fax: +7 71133 93074 ; E-Mail: info@ibemo-kz.com