Utilisation categories for switch-disconnectors


Type of current	Utilisation category	Typical examples of application 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 endurance							Verification of switching capacity
			Make				Break			Make				Break
						cos φ			cos φ				cos φ			cos φ
AC	AC-20 A(B)²⁾	Making and breaking without load	All values	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾	All values	¹⁾		¹⁾	¹⁾		¹⁾
	AC-21 A(B)²⁾	Switching resistive loads including low overloads	All values	1	1	0.95	1	1	0.95	All values	1.5	1.05	0.95	1.5	1.05	0.95
	AC-22 A(B)²⁾	Switching mixed resistive and inductive loads including low overloads	All values	1	1	0.8	1	1	0.8	All values	3	1.05	0.65	3	1.05	0.65
	AC-23 A(B)²⁾	Switching motors and other highly inductive loads	All values	1	1	0.65	1	1	0.65	I_e ≤100 I_e > 100	10 10	1.05 1.05	0.45 0.35	8 8	1.05 1.05	0.45 0.35
						L/R ms			L/R ms				L/R ms			L/R ms
DC	DC-20 A(B)²⁾	Making and breaking without load	All values	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾	All values	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾	¹⁾
	DC-21 A(B)²⁾	Switching resistive loads including low overloads	All values	1	1	1	1	1	1	All values	1.5	1.05	1	1.5	1.05	1
	DC-22 A(B)²⁾	Switching mixed resistive and inductive loads, including low overloads (e.g. shunt motors)	All values	1	1	2	1	1	2	All values	4	1.05	2.5	4	1.05	2.5
	DC-23 A(B)²⁾	Switching highly inductive loads (e.g. series motors)	All values	1	1	7.5	1	1	7.5	All values	4	1.05	15	4	1.05	15
For load-break switches, switch-disconnectors and switch-fuse units to IEC/EN 60947-3 (VDE 0660 part 107) 1) If the switching device has a making and/or breaking capacity, the figures for the current and the power factor (time constants) must be stated by the manufacturer. 2) A: frequent operation, B: occasional operation.