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 recognises 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 I 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
Test Button
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