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4.44 General Catalogue • Protection Devices • Technical

Transformer/Motor Protection

Transformer Protection

Tables 19 & 20 show the recommended MCB’s for the protection of

single phase (230V) and three phase (400V) transformers.

Single Phase 230V

Recommended MCB

Transformer

Rating (VA)

Primary

Current

NBN NCN NDN

500.22 -16

1000.43 -26

2000.87 -36

2501.09 646

3001.30 1046

4001.74 1066

5002.1716 10 6

7503.2616 10 6

10004.3525 16 10

250010.8763 40 20

500021.74 -6332

750032.60 --50

1000043.48 --63

Three Phase 400V

Recommended MCB

Transformer

Rating (VA)

Primary

Current

NBN NCN NDN

5000.72 -36

7501.08 646

10001.44 1066

20002.8816 10 6

30004.3325 16 10

40005.7732 20 10

50007.2140 25 16

750010.8263 32 20

1000014.43 -5025

1500021.64 -6332

2000028.86 --50

2500036.07 --63

Motor Circuit Protection

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.

Motor RatingDOL Starting

Conditions

Assisted Start Conditions

Up to 0.75kW5 x FLC for 6 secs2.5 x FLC for 15 secs

1.1 to 7.5kW6 x FLC for 10 secs2.5 x FLC for 15 secs

11 to 75kW7 x FLC for 10 secs2.5 x FLC for 15 secs

90 to 160kW6 x FLC for 15 secs2.5 x FLC for 20 secs

1 Phase 230V DOL Starting

Recommended Circuit Breaker

kWhpFLC A(A)

NBN

(A)

NCN

(A)

NDN

Fuse

(A)

0.180.252.816 10 10 10

0.250.333.216 10 10 16

0.370.53.516 10 10 16

0.550.754.820 16 16 16

0.751.06.225 20 20 20

1.1 1.5 8.7 40252525

1.52.011.850 32 32 32

2.23.017.5 -505040

3.04.020 -63 63 50

3.755.024- - - 63

5.57.536- - - 80

7.51047- - - 100

3 Phase 400V Assisted Starting Star-Delta

Recommended Circuit Breaker

kWhpFLC A(A) NCN(A) NDNHRC Fuse (A)

346.3 161016

45.5 8.2 201016

5.57.511.2 321620

7.510 14.440 25 25

11 15 21 50 32 32

15 20 27 -40 35

18.525 32 -50 40

22 30 38 -63 50

30 40 51 --63

37 50 63 --80

45 60 76 --80

55 75 91 --100

75100 124 --160

90125 154 --200

110 150 183 --200

132 175 219 --250

150 200 240 --315

160 220 257 --315

Produktspecifikationer