Page 834 - Motor_protection_and_control_Manual_motor_starters_ contactors
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North American standards and utilization categories
Depending on the utilization category or intended rating for a contactor, North American standards require two main tests: an endurance test to
simulate conventional device making and breaking capacity over its lifetime, and an overload test to simulate periodic conditions demanding higher
making and breaking capacity than is conventional for the application. The test setups differ in regards to current, power factor, and number of
electrical operating cycles.
The tables below provide a comparison of the types of load testing for contactors rated up to 100 A.
AC load testing for contactors rated up to 100 A
Harmonized test Rating designation Endurance (conventional) test Overload (conditional) test Required load marking
IEC UL CSA Multiple Power Number Multiple Power Number
of current factor of cycles of current factor of cycles
General use, non-inductive or slighting inductive loads, resistance furnaces and heaters
AC-1: general use 1 0.8 6 000 1.5 0.8 50 –
AC resistance 1 1 6 000 1.5 1 50 "Resistive"
AC resistance air heating 1 1 100 000 1.5 1 50 "Resistance"
AC electrical heating control 1 1 250 000 1.5 1 50 –
Motor loads
AC-2: slip-ring motors 2 0.65 6 000 4 0.65 50 –
AC-3: squirrel cage motors 2 0.45 6 000 10 for make 0.45 50 make + –
8 for make break 50 make break
AC motor (across-the-line switching) 2 0.40 – 0.50 1 000 LRA (~6) 0.40 – 0.50 50 –
Elevator control, AC motor 2 0.50 500 000 n/a n/a n/a "Elevator duty"
AC-4: plugging, inching, jogging 6 0.45 6 000 12 for make 0.45 50 make + –
10 for make break 50 make break
Lamps and lighting loads
AC-5a: electric discharge lamps 2 0.45 6 000 3 0.45 50 "Ballast"
AC-5b: incandescent lamps 1 Lamp 6 000 1.5 Lamp 50 "Tungsten"
Transformers and capacitors
AC-6a: transformers The manufacturer shall verify the AC-6a rating by testing with a transformer, or may derive the rating from the values for AC-3.
AC-6b: capacitors Capacitive ratings may be derived by capacitor switching tests or assigned on the basis of established practice and experience.
Capacitive switching (kVar) 1 Capacitor 6 000 1.5 Capacitor 50 –
Hermetic refrigerant compressor motors
AC-8a: hermetic refrigerant 1 0.8 30 000 6 0.45 50 "Hermetic refrigeration
compressor compressor"
AC-8b: hermetic refrigerant 6 0.45 6 000 6 0.45 50 –
compressor (recycle rating)
Note: the information above is an overview of UL 60947-4-1 tables 1, 7, 10, 5.4.1DV.1.1, 8.2.4.1DV.1.1, and 8.2.4.2DV.1.1 and is intended for comparison purposes only.
DC load testing for contactors rated up to 100 A
Harmonized test Rating designation Endurance test Overload test Required load marking
IEC UL CSA Multiple L/R ms Number Multiple L/R ms Number
of current of cycles of current of cycles
General use, non-inductive or slighting inductive loads, resistance furnaces and heaters
13 DC-1: general use 1 1 6 000 1.5 1 50 –
DC resistance 1 1 6 000 1.5 1 50 "Resistive"
DC resistance air heating 1 1 100 000 1.5 1 50 "Resistance"
Motor loads
DC-3: shunt motors 2.5 2 6 000 4 2.5 50 –
DC motor (across-the-line switching) 2 n/a 1 000 10 n/a 50 –
Elevator control, DC motor 2 n/a 500 000 Not applicable "Elevator duty"
DC-5: series motors 2.5 7.5 6 000 4 15 50 –
Lamps and lighting loads
DC-6: incandescent lamps 1 Lamp 6 000 1.5 Lamp 50 "Tungsten"
Note: the information above is an overview of UL 60947-4-1 tables 1, 7, 10, 5.4.1DV.1.1, 8.2.4.1DV.1.1, and 8.2.4.2DV.1.1 and is intended for comparison purposes only.
1SBC100110S0201
13/16 | ABB
