Protection Calculator

Comprehensive electrical protection analysis: OCPD sizing, device coordination, and relay settings per NEC requirements

OCPD Sizing Calculator

Calculate overcurrent protection device sizing per NEC Article 240

Load Type

Protection Device Type

Load Current (A)

Load Operating Time

Continuous (≥3 hours)Non-continuous (<3 hours)

15A

20A

25A

30A

35A

40A

45A

50A

60A

70A

80A

90A

100A

110A

125A

150A

175A

200A

225A

250A

300A

350A

400A

450A

500A

600A

700A

800A

Larger sizes available: 1000A, 1200A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 6000A