NEMA contact ratings
NEMA contact ratings are how much current at a rated voltage a relay or other pilot device can switch. The current rating of smaller NEMA contactors or their auxiliaries are defined by NEMA ICS 5: Industrial Control and Systems, Control Circuit and Pilot Devices[1] standard. The nomenclature is a letter followed by a three digit number, the letter designates the current rating of the contacts and the current type (i.e., AC or DC) and the number designates the maximum voltage design values.
AC Contact Ratings
| Contact Rating Designation | Thermal Current | Voltage |
|---|---|---|
| A150 | 10 | 150 |
| A300 | 10 | 300 |
| A600 | 10 | 600 |
| B150 | 5 | 150 |
| B300 | 5 | 300 |
| B600 | 5 | 600 |
| C150 | 2.5 | 150 |
| C300 | 2.5 | 300 |
| C600 | 2.5 | 600 |
| D150 | 1 | 150 |
| D300 | 1 | 300 |
| E150 | 0.5 | 150 |
DC Contact Ratings
| Contact Rating Designation | Thermal Current | Voltage | Voltamperes |
|---|---|---|---|
| N150 | 10 | 150 | 275 |
| N300 | 10 | 300 | 275 |
| N600 | 10 | 600 | 275 |
| P150 | 5 | 150 | 138 |
| P300 | 5 | 300 | 138 |
| P600 | 5 | 600 | 138 |
| Q150 | 2.5 | 150 | |
| Q300 | 2.5 | 300 | |
| Q600 | 2.5 | 600 | |
| R150 | 1 | 150 | |
| R300 | 1 | 300 |
References
- ↑ "NEMA ICS 5-2000 (R2005, R2010)". Retrieved 1 June 2012.
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