Moeller - Utilisation categories for contactors and motor starters


Type of current	Utilisation catorgory	Typical applications: I = Switch-on current, I_c = Switch-off current, I_e = Rated operational current, U = voltage, U_e = Rated operational voltage U_r = Recovery voltage	Verification of electrical lifespan							Verification of switching capacity
			Switch on				Switch off			Switch on				Switch off
						cos φ			cos φ				cos φ			cos φ
Alternating current	AC-1	Non-inductive or slightly inductive loads, resistance furnaces	All values	1	1	0.95	1	1	0.95	All values	1.5	1.05	0.8	1.5	1.05	0.8
	AC-2	Slip-ring motors: starting, switch-off	All values	2.5	1	0.65	2.5	1	0.65	All values	4	1.05	0.65	4	1.05	0.8
	AC-3	Squirrel-cage motors: stating, switch-off, switch-off during running⁴⁾	I_e ≤ 17 I_e > 17	6 6	1 1	0.65 0.35	1 1	0.17 0.17	0.65 0.35	I_e ≤ 100 I_e > 100	8 8	1.05 1.05	0.45 0.35	8 8	1.05 1.05	0.45 0.35
	AC-4	Sqirrel-cage motors: starting, plugging, reversing, inching	I_e ≤ 17 I_e > 17	6 6	1 1	0.65 0.35	6 6	1 1	0.65 0.35	I_e ≤ 100 I_e > 100	10 10	1.05 1.05	0.45 0.35	10 10	1.05 1.05	0.45 0.35
	AC-5A	Switching of electric discharge lamp controls									3.0	1.05	0.45	3.0	1.05	0.45
	AC-5B	Switching of incandescent lamps									1.5²⁾	1.05	²⁾	1.5²⁾	1.05	²⁾
	AC-6A³⁾	Switching of transformers
	AC-6B³⁾	Switching of capacitor banks
	AC-7A	Slightly inductive loads in household appliances and similar applications	Data as supplied by the manufacturer								1.5	1.05	0.8	1.5	1.05	0.8
	AC-7B	Motor load for household appliances									8.0	1.05	¹⁾	8.0	1.05	¹⁾
	AC-8A	Switching of hermetically enclosed refrigerant compressor motors with manual reset of overload releases⁵⁾									6.0	1.05	¹⁾	6.0	1.05	¹⁾
	AC-8B	Switching of hermetically enclosed refrigerant compressor motors with automatic reset of overload releases⁵⁾									6.0	1.05	¹⁾	6.0	1.05	¹⁾
	AC-53a	Switching of squirrel-cage motor with semi-conductor contactors									8.0	1.05	0.35	8.0	1.05	0.35