Busbar Size

X Sectional area

Weight

Approx D.C Resistance 20°C

Approx D.C rating (1)

Approx A.C rating

Moment of Inertia

Modulus of Section Z

Still Air (3)

Free Air (3)

Still Air

Free Air

Edge-wise

Flat

Edge-wise

Flat

mm

mm2

kg/m

mW/m

A

A

A

A

mm4

mm4

mm3

mm3

10 x 1.60

16

0.143

1077

105

115

105

115

133.3

3.413

26.66

4.266

12.5 x 1.60

20

0.179

862

125

135

125

135

260.4

4.266

41.66

5.333

16 x 1.60

25.6

0.229

673

155

170

155

170

546.1

5.461

68.26

6.826

20 x 1.60

32

0.286

538

185

205

185

205

1,066

6.826

106.6

8.533

25 x 1.60

40

0.357

431

225

250

225

250

2,083

8.533

166.6

10.67

30 x 1.60

48

0.429

359

265

290

265

290

3,600

10.24

240

12.8

10 x 2.00

20

0.179

862

115

130

115

130

166.6

6.666

33.32

6.666

12.5 x 2.00

25

0.223

689

140

155

140

155

325.5

8.333

52.08

8.333

16 x 2.00

32

0.286

538

175

190

175

190

682.6

10.66

85.33

10.66

20 x 2.00

40

0.357

431

210

230

210

230

1,333

13.33

133.3

13.33

25 x 2.00

50

0.446

344

255

280

255

280

2,604

16.66

208.3

16.66

30 x 2.00

60

0.536

287

295

330

295

330

4,500

20

300

20

40 x 2.00

80

0.714

215

380

420

380

420

10,660

26.66

533

26.66

10 x 2.50

25

0.223

689

130

145

130

145

208.3

13.02

41.66

10.42

12.5 x 2.50

31.25

2.279

557

160

175

160

175

406.9

16.27

65.6

13.02

16 x 2.50

40

0.357

431

195

215

195

215

853.3

20.83

106.7

16.66

20 x 2.50

50

0.446

344

235

260

235

260

1,666

26.04

166.6

20.83

25 x 2.50

62.5

0.558

275

285

315

285

315

3,255

32.55

260.4

26.04

30 x 2.50

75

0.67

229

330

370

330

370

5,625

39.06

375

31.25

40 x 2.50

100

0.893

172

425

475

425

475

13,330

52.08

666.5

41.66

50 x 2.50

125

1.115

137

520

575

520

575

26,040

65.1

1041

52.08

60 x 2.50

150

1.339

114

605

675

605

675

45,000

78.13

1500

62.5

10 x 2.75

31.5

0.281

547

150

170

150

170

262.5

26.05

5205

16.54

12.5 x 2.75

39.4

0.352

437

180

200

180

200

512.7

32.56

82.03

20.67

20 x 3.0

60

0.536

287

260

290

260

290

2,000

45

200

30

25 x 3.0

75

0.67

229

315

350

314

350

3,906

56.25

312.4

37.5

30 x 3.0

90

0.803

191

365

405

365

405

6,750

67.5

450

45

40 x 3.0

120

1.071

143

470

520

470

520

16,000

90

800

60

50 x 3.0

150

1.339

114

570

635

570

635

31,250

112.5

1,250

75

60 x 3.0

180

1.607

95.7

665

740

665

740

54,000

135

1,800

90

80 x 3.0

240

2.142

71.8

860

955

860

955

128 x 103

180

3,200

120

10 x 4.0

40

0.357

431

175

195

175

195

333.3

53.33

66.66

26.67

12.5 x 4.0

50

0.446

344

210

230

210

230

651

66.67

104.2

33.34

16 x 4.0

64

0.571

269

255

285

255

285

1,365

85.33

170.6

42.67

20 x 4.0

80

0.714

215

305

340

305

340

2,666

106.7

266.6

53.35

25 x 4.0

100

0.893

172

365

410

365

410

5,208

133.3

416.6

66.65

30 x 4.0

120

1,071

143

430

475

430

475

8,999

1600

599.6

80

40 x 4.0

160

1.428

107

545

610

540

605

21,330

213.3

1,066.50

106.7

50 x 4.0

200

1.785

86.2

665

740

660

735

41,660

266.7

1,666

133.4

60 x 4.0

240

2.142

71.8

775

860

770

855

72,000

320

2,400

160

80 x 4.0

320

2.856

53.8

995

1,120

980

1,105

170 x 103

426.7

4,268

213.4

100 x 4.0

400

3.571

43.1

1,210

1,365

1,185

1,340

333 x 103

533.3

6,666

266.7

10 x 5.0

50

0.446

344

200

225

200

225

416.7

104.2

83.34

41.68

12.5 x 5.0

62.5

0.558

275

240

265

240

265

813.4

130.2

130.1

52.08

16 x 5.0

80

0.714

215

290

325

290

325

1,707

166.7

213.4

66.68

20 x 5.0

100

0.893

172

345

385

345

385

3,333

208

333.3

83.2

25 x 5.0

125

1.116

137

415

465

415

465

6,560

260.4

520.8

104.2

30 x 5.0

150

1.339

114

485

540

480

540

11,250

312.5

750

125

40 x 5.0

200

1.785

86.2

615

685

610

680

26,670

416.7

1334

166.7

50 x 5.0

250

2.232

68.9

745

830

740

820

52,080

520.8

2,083

208.3

60 x 5.0

300

2.678

57.4

870

970

865

960

90,000

625

3,000

250

80 x 5.0

400

3571

431

1,120

1,260

1,110

1,250

213 x 103

833.3

5,333

333.3

100 x 5.0

500

4464

344

1,355

1,530

1,345

1,520

417 x 103

1,042

8,334

416.8

10 x 6.3

63

0.562

273

235

260

235

260

525

208.4

105

66.16

12.5 x 6.3

78.75

0.703

218

275

305

275

305

1,025

260.5

164

82.7

16 x 6.3

100.8

0.899

171

335

370

335

370

2,150

333.4

268.8

105.8

20 x 6.0

120

1.071

143

385

430

385

430

4,000

360

400

120

25 x 6.0

150

1.339

114

460

515

460

515

7,813

450

625

150

30 x 6.0

180

1.607

95.7

535

600

535

595

15,500

540

900

180

40 x 6.0

240

2.142

71.8

680

760

675

755

32,000

720

1,600

240

50 x 6.0

300

2.678

57.4

825

915

815

910

62,500

900

2,500

300

60 x 6.0

360

3.214

47.8

965

1,075

955

1,065

108 x 103

1,080

3,600

360

80 x 6.0

480

4.285

35.9

1,230

1,370

1,220

1,355

256 x 103

1,440

6,400

480

100 x 6.0

600

5.356

28.7

1,490

1,680

1,480

1,670

500 x 103

1,800

10,000

600

120 x 6.0

720

6.428

23.9

1,750

1,970

1,700

1,915

864 x 103

2,160

14,400

720

160 x 6.0

960

8.57

17.9

2,250

2,535

2,130

2,400

2.05 x 106

2,880

25,600

960

20 x 8.0

160

1.428

107

460

510

455

510

5,333

853.3

533

213.3

25 x 8.0

200

1.785

86.2

545

610

545

605

10,420

1,067

833.6

266.7

30 x 8.0

240

2.142

71.8

630

705

630

700

18,000

1,280

1,200

320

40 x 8.0

320

2.856

53.8

800

890

795

885

42,670

1,707

2,134

426.8

50 x 8.0

400

3.571

43.1

965

1,070

950

1,055

83,300

2,133

3,333

533.3

60 x 8.0

480

4.285

35.9

1,120

1,250

1,110

1,235

144 x 103

2,560

4,800

640

80 x 8.0

640

5.713

26.9

1,435

1,595

1,420

1,580

341 x 103

3,413

8,533

853.3

100 x 8.0

800

7.142

21.5

1,735

1,955

1,595

1,800

667 x 103

4,267

13,330

1067

120 x 8.0

960

8.57

17.9

2,032

2,290

1,760

1,985

1.15 x 106

5,120

19,200

1280

160 x 8.0

1280

11.43

13.4

2,610

2,935

2,230

2,510

2.73 x 106

6,827

34,140

1707

200 x 8.0

1600

14.27

10.8

3,170

3,570

2,760

3,110

5.33 x 106

8,533

53,330

2133

20 x 10

200

1.785

86.2

525

585

480

535

6,670

1,667

667

333.4

25 x 10

250

2.232

68.9

625

695

580

645

13,020

2,083

1,042

416.6

30 x 10

300

2.678

57.4

720

825

700

795

22,500

2,500

1,500

500

40 x 10

400

3.571

43.1

910

1,030

880

995

53,330

3,333

2,667

666.6

50 x 10

500

4.64

34.4

1,090

1,235

1,060

1,200

104 x 103

4,167

4,168

833.4

60 x 10

600

5.356

28.7

1,270

1,435

1,200

1,355

180 x 103

5,000

6,000

1,000

80 x 10

800

7.142

21.5

1,615

1,840

1,525

1,735

427 x 103

6,667

10,670

1,333

100 x 10

1,000

8.928

17.2

1,950

2,225

1,800

2,065

833 x 103

8,333

16,670

1,667

120 x 10

1,200

10.71

14.3

2,285

2,610

2,100

2,395

144 x 103

10,000

23,980

2,000

160 x 10

1,600

14.28

10.7

2,930

3,380

2,620

3,040

341 x 103

13,330

42,660

2,666

200 x 10

2,00

17.84

8.62

3,550

4,150

3,140

3,630

6.67 x 106

16,670

66,670

3,334

250 x 10

2,500

22.3

6.89

4,320

5,030

3,710

4,310

13.0 x 106

20,830

104 x 103

4,166

25 x 12

300

2.678

57.4

700

710

640

650

15,630

3,599

1,250

599.8

30 x 12

360

3.214

47.8

805

820

750

765

27,000

4,319

1,800

719.8

40 x 12

480

4.285

35.9

1,010

1,100

950

1,030

64,000

5,759

3,200

959.8

50 x 12

600

5.356

28.7

1,210

1,330

1,160

1,275

125 x 103

7,199

5,000

1,199

60 x 12

720

6.428

23.9

1,405

1,550

1,320

1,455

216 x 103

8,639

7,200

1,439

80 x 12

960

8.57

17.9

1,785

2,000

1,670

1,870

512 x 103

11,519

12,800

1,919

100 x 12

1,200

10.71

14.3

2,155

2,420

2,010

2,255

1.00 x 106

14,390

20,000

2,398

120 x 12

1,440

12.85

11.9

2,520

2,880

2,310

2,640

1.73 x 106

17,280

28,800

2,880

160 x 12

1,920

17.14

8.97

3,225

3,650

2,860

3,235

4.10 x 106

23,040

51,200

3,840

200 x 12

2,400

21.43

7.18

3,910

4,480

3,380

3,870

8.00 x 106

28,790

80,000

4,798

250 x 12

3,000

26.78

5.74

4,750

5,440

4,060

4,650

15.6 x 106

35,990

125 x 103

5,998

25 x 16

400

3.571

43.1

840

960

740

855

20,830

8,533

16.7 x 103

1,067

30 x 16

480

4.285

35.9

960

1,095

845

975

35,990

10,240

24.0 x 103

1,280

40 x 16

640

5.713

26.9

1,200

1,370

1,055

1,220

85,330

13,650

42.7 x 103

1,706

50 x 16

800

7.142

21.5

1,430

1,635

1,260

1,450

167 x 103

17,070

66.7 x 103

2,134

60 x 16

960

8.57

17.9

1,660

1,895

1,460

1,685

288 x 103

20,480

96.0 x 103

2,560

80 x 16

1,280

11.43

13.4

2,100

2,400

1,850

2,130

683 x 103

27,310

171 x 103

3,414

100 x 16

1,600

14.28

10.7

2,530

2,880

2,220

2,560

1.33 x 106

34,130

267 x 103

4,266

120 x 16

1,920

17.14

8.97

2,940

3,360

2,590

2,990

2.30 x 106

40,960

384 x 103

5,120

160 x 16

2,560

22.85

6.73

3,750

4,360

3,180

3,700

5.46 x 106

54,610

683 x 103

6,826

200 x 16

3,200

28.57

5.38

4,540

5,725

3,760

4,370

10.7 x 106

68,270

1.07 x 106

8,534

250 x 16

4,000

35.71

4.31

5,520

6,425

4,500

5,250

20.8 x 106

85,330

1.67 x 106

10,670

300 x 16

4,800

42.84

3.59

6,460

7,525

5,270

6,150

36.0 x 106

102 x 103

2.40 x 106

12,800

Notes:
1. Ratings apply for single bars on edge operating in a 40°C ambient temperature with 50°C temperature rise.
2. A.C. Ratings are for frequencies up to 60 Hz.
3. ‘Free Air’ Conditions assume some air movement other than convection currents, and may be applicable for outside installations. ‘Still’ and ‘Free’ Air Conditions both assume no enclosure.
4. Source data: www.cda.org.uk

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