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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

NBNNCNNDN

500.22-16

1000.43-26

2000.87-36

2501.09646

3001.301046

4001.741066

5002.1716106

7503.2616106

10004.35251610

250010.87634020

500021.74-6332

750032.60--50

1000043.48--63

Three Phase 400V

Recommended MCB

Transformer

Rating (VA)

Primary

Current

NBNNCNNDN

5000.72-36

7501.08646

10001.441066

20002.8816106

30004.33251610

40005.77322010

50007.21402516

750010.82633220

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)

0.180.252.816101010

0.250.333.216101016

0.370.53.516101016

0.550.754.820161616

0.751.06.225202020

1.11.58.740252525

1.52.011.850323232

2.23.017.5-505040

3.04.020-636350

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)

346.3161016

45.58.2201016

5.57.511.2321620

7.51014.4402525

111521503232

152027-4035

18.52532-5040

223038-6350

304051--63

375063--80

456076--80

557591--100

75100124--160

90125154--200

110150183--200

132175219--250

150200240--315

160220257--315

Produktspecifikationer