Catalogs > Industrial Controls Catalog > Important Safety and Product Information
Important Safety and Product Information
| Important User Information |  |
General Terms and Conditions of Sale | |
Maintenance of Solid-State Control | |
Product Compliance Information | |
Specifying Enclosures | |
NEMA Ratings | |
NEMA Ratings and Test Values for AC Control Circuit Contacts at 50 or 60 Hz
| Maximum Current [A] | |||||||||||
| NEMA Contract Rating Designation | Thermal Continuous Test Current [A] | 120V | 240V | 480V | 600V | VA | |||||
| Make | Break | Make | Break | Make | Break | Make | Break | Make | Break | ||
| A150 | 10 | 60 | 6.00 | — | — | — | — | — | — | 7200 | 720 |
| A300 | 10 | 60 | 6.00 | 30 | 3.00 | — | — | — | — | 7200 | 720 |
| A600 | 10 | 60 | 6.00 | 30 | 3.00 | 15 | 1.50 | 12 | 1.20 | 7200 | 720 |
| B150 | 5 | 30 | 3.00 | — | — | — | — | — | — | 3600 | 360 |
| B300 | 5 | 30 | 3.00 | 15 | 1.50 | — | — | — | — | 3600 | 360 |
| B600 | 5 | 30 | 3.00 | 15 | 1.50 | 7.50 | 0.75 | 6 | 0.60 | 3600 | 360 |
| C150 | 2.5 | 15 | 1.50 | — | — | — | — | — | — | 1800 | 180 |
| C300 | 2.5 | 15 | 1.50 | 7.50 | 0.75 | — | — | — | — | 1800 | 180 |
| C600 | 2.5 | 15 | 1.50 | 7.50 | 0.75 | 3.75 | 0.375 | 3 | 0.30 | 1800 | 180 |
| D150 | 1.0 | 3.60 | 0.60 | — | — | — | — | — | — | 432 | 72 |
| D300 | 1.0 | 3.60 | 0.60 | 1.80 | 0.30 | — | — | — | — | 432 | 72 |
| D600 | 0.5 | 1.80 | 0.30 | — | — | — | — | — | — | 216 | 36 |
| 2X A300 | 20 | 120 | 12 | 60 | 6.00 | — | — | — | — | 14400 | 1440 |
| 2X A600 | 20 | 120 | 12 | 60 | 6.00 | 30 | 3.00 | 24 | 2.40 | 14400 | 1440 |
NEMA Ratings and Test Values for DC Control Circuit Contacts
| Maximum Current [A] | ||||||
| NEMA Contract Rating Designation | Thermal Continuous Test Current [A] | 5…28V | 125V | 250V | 301…600V | Make or Break at 300V or less [VA] |
| N150 | 10 | 10 | 2.2 | — | — | 275 |
| N300 | 10 | 10 | 2.2 | 1.1 | — | 275 |
| N600 | 10 | 10 | 2.2 | 1.1 | 0.40 | 275 |
| P150 | 5.0 | 5.0 | 1.1 | — | — | 138 |
| P300 | 5.0 | 5.0 | 1.1 | 0.55 | — | 138 |
| P600 | 5.0 | 5.0 | 1.1 | 0.55 | 0.20 | 138 |
| Q300 | 2.5 | 2.5 | 0.55 | 0.27 | 0.11 | 69 |
| Q600 | 2.5 | 2.5 | 0.55 | 0.27 | 0.11 | 69 |
| 2X P600 | 10 | 10 | 2.2 | 1.1 | 0.40 | 275 |
NEMA Definitions for Contact Arrangements
Form "A" Contacts
A Form "A" contact arrangement is one that has single-pole single-throw normally open contacts. The function of this arrangement is to close a circuit when actuated.
Form "B" Contacts
A Form "B" contact arrangement is one that has single-pole single-throw normally closed contacts. The function of this arrangement is to open a circuit when actuated.
Form "C" Contacts
A Form "C" contact arrangement is one that has single-pole double-throw contacts with three terminals — one for normally open, one for normally closed, and one common. The function of this arrangement is to transfer a circuit when actuated.
Form "X" Contacts
A Form "X" contact arrangement is one that has single-pole single-throw normally open double make contacts. The function of this arrangement is to close a circuit when actuated.
Form "Y" Contacts
A Form "Y" contact arrangement is one that has single-pole single-throw normally closed double break contacts. The function of this arrangement is to open a circuit when actuated.
Form "Z" Contacts
A Form "Z" contact arrangement is one that has single-pole double-throw contacts with four terminals — two for normally open and two for normally closed. The function of this arrangement is to open one circuit and close the other.