These circuit-breakers protect electrical
equipment against thermal overloading and in the event of a short
circuit. They cover the rated current range from 20 to 1600 A.
Depending on the version, they have additional protective functions such
as fault-current protection, earth-fault protection or the capability
for energy management by recognition of load peaks, and deliberate load
shedding.
Circuit-breakers NZM are distinguished by their compact shape and their
current-limiting characteristics.
Switch-disconnectors without tripping units are available in the same
sizes as the circuit-breakers and can be fitted with additional shunt or
undervoltage releases to suit on the versions concerned.
Circuit-breakers NZM and switch-disconnectors are built and tested to
the specifications in IEC/EN 60947.
They feature isolating characteristics. In conjunction with a locking
device, they are suitable for use as main switches to IEC/EN 60204.
The electronic releases of frame sizes NZM2, NZM3 and NZM4 feature
communication capabilities.
The current states of the circuit-breaker onsite can be visualized via a
Data Management Interface (DMI) or via digital output signals.
Additionally, the circuit-breakers can be connected to a network, e.g.
PROFIBUS-DP.
