Moeller - with residual current device - Residual current releases combined with circuit-breakers are used for protection against the effects of leakage currents. These device combinations fulfill the following tasks:

Residual current releases combined with circuit-breakers are used for protection against the effects of leakage currents. These device combinations fulfill the following tasks:

Overload protection,

Short-circuit protection,

Fault-current protection.

Depending on type the residual current releases protect the following:

Persons against direct contact (basic protection),

Persons against indirect contact (fault protection),

Dangers of an earth fault (fire etc.)

These kinds of residual current releases can be attached to the NZM1 and NZM2 circuit-breakers. No auxiliary voltage is required. In the event of a fault, the residual current release trips the circuit-breaker, i.e. the main contacts are opened. The circuit-breaker and the residual current release must be reset to restore the supply.

The main functions and the associated values are shown in the following table.


Part no.	Rated current range	U_e	I_Δ_n	t_v	Sensitivity
	A	V	A	ms

NZM1(-4)-XFI30(R)(U)	15 – 125	200 – 415	0.03	–	pulsating current
NZM1(-4)-XFI300(R)(U)	15 – 125	200 – 415	0.3	–
NZM1(-4)-XFI(R)(U)	15 – 125	200 – 415	0.03; 0.1; 0.3 0.5; 1; 3	10; 60; 150; 300; 450
NZM2-4-XFI30¹⁾	15 – 250	280 – 690	0.03	–
NZM2-4-XFI¹⁾	15 – 250	280 – 690	0.1; 0.3; 1; 3	60; 150; 300; 450
NZM2-4-XFI30A¹⁾	15 – 250	50 – 400	0.03	–	AC/DC
NZM2-4-XFIA¹⁾	15 – 250	50 – 400	0.1; 0.3; 1	60; 150; 300; 450	AC/DC
¹⁾ Devices are not dependent on the supply voltage.

They can be used in three-phase and single-phase systems.

With 2-pole operation it must be ensured that voltage is applied to both terminals required for test functions.

Position 1 Test button (T)

Position 2 NZM1-(4)..., NZM2-4...

Position 3 +NZM2-4-XFI

Position 4 NZM1-(4)-XFI

Trip indication is implemented via auxiliary contacts. The NZM2-4-XFI… has fixed contacts. The NZM1(-4)-XFI… allows two M22-K… contact elements from the Moeller RMQ-Titan range to be clipped in.

Contact representation for “not released” [t-head3]

NZM1(-4)-XFI…



M22-K10	M22-K02

NZM2-4-XFI…