NEMA and IEC control circuit classifications AC-Control Circuit Classifications—NEMA NEMA designates Control Circuit Rating with a code letter (for current) and a voltage code. Ratings & Test Values for AC Control Circuit Contacts at 50 or 60Hz Thermal Maximum Current, Amperes Contact Continuous 240 Volts Rating Test Current, 120 Volts Designation Amperes Make Break Make A150 A300 A600 B150 B300 B600 C150 C300 C600 D150 D300 E150 10 10 10 5 5 5 2.5 2.5 2.5 1 1 0.5 60 60 60 30 30 30 15 15 15 3.6 3.6 1.8 6 6 6 3 3 3 1.5 1.5 1.5 0.6 0.6 0.3 480 Volts Break Make — 3 3 — 1.5 1.5 — 0.75 0.75 — 0.3 — — — 15 — — 7.5 — — 3.75 — — — — 30 30 — 15 15 — 7.5 7.5 — 1.8 — 600 Volts Break Voltamperes Make Break Make Break — — 12 — — 6 — — 3 — — — — — 1.2 — — 0.6 — — 0.3 — — — 7200 7200 7200 3600 3600 3600 1800 1800 1800 432 432 216 720 720 720 360 360 360 180 180 180 72 72 36 — — 1.5 — — 0.75 — — 0.375 — — — DC-Control Circuit Classifications—NEMA Rating codes for DC Control Circuit Contacts Contact Rating Designation1 ) Thermal Continuous Test Current, Amperes 125 Volt 250 Volt 301 to 600 Volt N150 N300 N600 P150 P300 P600 Q150 Q300 Q600 R150 R300 10 10 10 5 5 5 2.5 2.5 2.5 1 1 2.2 2.2 2.2 1.1 1.1 1.1 0.55 0.55 0.55 0.22 0.22 — 1.1 1.1 — 0.55 0.55 — 0.27 0.27 — 0.11 — — 0.4 — — 0.2 — — 0.1 — — Maximum Make or Break Voltamperes at 300 Volts or Less Maximum Make or Break2 ) Current, Amperes 275 275 275 138 138 138 69 69 69 28 28 Control Circuit Classifications—IEC3 ) IEC 947-5-1 Uses Utilization Categories AC15 to Specify Control Circuit Ranges. Current at each voltage is specified by the manufacturer, not by the standard. AC Control Circuit Utilization Categories per IEC 947-5-1 Make I/Ie U/Ue I/Ie U/Ue AC-12 AC-13 AC-14 AC-15 1 2 6 10 1 1 1 1 1 1 1 1 1 1 1 1 Break DC Control Circuit Utilization Categories per IEC 947-5-1 Make I/Ie U/Ue I/Ie U/Ue DC-12 DC-13 DC-14 1 1 10 1 1 1 1 1 1 1 1 1 Break Example of a Typical IEC Control Circuit Ratings Table4) DC AC Ie /AC-12 (Continuous Amps) Ue AC Voltage Ie /AC-15 Amps Voltage Ie /DC-12 Ie /DC-13 10 24V 110V 220/230V 380/440V 6A 6A 6A 4A 24 60 110 230 6A 5A 2.5A 1A 3A 1.5A 0.7A 0.3A 1)The numerical suffix designates the maximum voltage design values, which are to be 600, 300, and 150 volts for suffixes 600, 300, and 150 respectively. Test voltage shall be 600, 250, or 125 volts. MLLDLL. 2)For maximum ratings at 300 volts or less, the maximum make and break ratings are to be obtained by dividing the volt-ampere rating by the application voltage, but the current value is not to exceed the thermal continuous test current. 3) I e Rated operational current U e Rated operational voltage I Current to be made or broken U Voltage before make 4)Example: A control circuit contact having an AC-15 rating of 6 amps at 230 volts is capable of making 60 amps and breaking 6 amps at 230 volts. KRE.