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 DesignationThermal CurrentVoltage
A15010150
A30010300
A60010600
B1505150
B3005300
B6005600
C1502.5150
C3002.5300
C6002.5600
D1501150
D3001300
E1500.5150

DC Contact Ratings

Contact Rating DesignationThermal CurrentVoltageVoltamperes
N15010150275
N30010300275
N60010600275
P1505150138
P3005300138
P6005600138
Q1502.5150
Q3002.5300
Q6002.5600
R1501150
R3001300

See also

References

  1. "NEMA ICS 5-2017". Retrieved 25 February 2022.
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