These circuit-breakers with integrated residual current
protection offer:
- Overload protection
- Short-circuit protection
- Fault-current protection
In addition to the protective functions, this circuit-breaker can perform the functions of a main switch with isolating characteristics.
Like RCCB's built conform to VDE 0664, the residual current release recognizes AC and DC fault currents. The residual-current release
NZM74-... and NZM2-4-FI(30) are “pulse current sensitive”. The NZM2-4-FIA(30) is sensitive to AC and DC. In the event of a fault the
circuit-breaker disconnects the fault circuitry. The residual-current protective switches for the NZM2-4 and NZM74 are built and tested to
IEC/EN 60 947 and VDE 0664 Part 3.
The residual-current release requires no external auxiliary voltage for tripping. For the switch rated current range 30–250 A at rated voltages
200–690 V (NZM2-4) and 380 – 690 V (NZM74), rated fault currents In n=
0.1-0.5*-1-3 A and delay times tV ˜ 60-150-300-450 ms can be set in steps. The XFI30 or FIP30 trips at a rated fault current of 30 mA.
* 0.3 at NZM74
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