NZM Moulded Case Circuit-Breakers – NZM 1, 2, 3 & 4

[picture of NZM 1-4 circuit-breakers] Moeller's new NZM 1, 2, 3 & 4 moulded case circuit breakers are the only truly modular range on the market.

The uniquely uniform approach to mounting, operation, switching and accessories means you save time and money. The high quality design and construction means you go on saving, year after year. Plus with our highly competitive pricing, you can start saving now.

optional data management interface for improved diagnostics and rapid fault analysis
common base plate on all rotary handles for faster installation
four switches with switching levels from 25 kA – 150 kA
compact size saves panel space
toggle actuator or rotary option
identical operation, function, mounting and fitting for each frame size
standard mounting spacers for user-friendly installation
uniform range of auxiliary contacts and releases with simple screw or spring-loaded connection
innovative double-break contact system for enhanced performance
option of plug-in and withdrawable units
free software enables setting-specific representation of tripping characteristics of several devices on the same scales.

Communication opens up new possibilities

NZM and IZM circuit-breakers open up new possibilities for power distribution and automation with their communication capability. They can log all the information data important for the operation, indicate the status locally and then communicate them on to higher-level systems. In this way, the transparency of the system is increased and reaction times to critical states like overcurrent, phase imbalance or phase failure are reduced. Rapid intervention in a process can help avoid system breakdowns, and preventive maintenance can be planned. This enhances system and machine availability and avoids costly production downtimes.

The electronic releases provide an interface for an optional data management interface. A display permits all currents measured by the circuit-breaker and which have led to tripping due to a mains fault, to be displayed. This function saves using a number of ammeters and allows rapid fault analysis. The bus coupler from the familiar "easy" automation range from Moeller creates the link to standardized bus systems such as Profibus DP.

Universal Accessories

The mode of operation and fitting of the accessories is identical for every frame size. Contacts from the RMQ-Titan range of control circuit devices are used across the entire NZM range of circuit-breakers. This ensures a reduction in the variety of types, a decrease in ordering expense and effort and consequently, simpler stock-keeping.

The contact elements simply clip in from the front. The position determines the function: signalling contact or trip-indicating auxiliary contact.

The door coupling rotary handle – for uniform, flexible solutions

Because the base plate is the same for every door coupling rotary handle, an identical drilling diagram is used – so speeding up installation times. The switches can also be fitted vertically or horizontally in the control panel.

Up to 630 A, the side wall operator enables the switch to be operated from the right or left hand side as desired. Optional fitting of our mounting bracket results in optimum use of space in the control panel.

The mounting plate can thus be used for other machine control elements.

The remote operators – simple, uniform operation

Remote operators The concept of uniform functions brings about simpler operation for all remote operators. The spring-powered actuator permits closing delays of 100ms, so allowing use in the field of synchronization. Short function sequences and fewer parts ensure a high degree of stability and a long service life. Safety is also enhanced by the sealing option for the Auto function and by the facility for padlocking the remote operator.

The actuator – toggle or rotary

The new range of circuit-breakers is actuated as standard using the tried and tested toggle lever. Three switch positions On, Off and Tripped indicate the status of the device. For typical disconnector applications, where no voltage release is required, Moeller offers competitively-priced PN switch-disconnectors with switch position indication 0 and 1.

Depending on individual requirements, toggling can be converted to a rotary movement by fitting a rotary handle. When using the main- or Emergency-Stop switch with a rotary handle, it can be locked using up to three padlocks. The rotary handles are also available in red/yellow for Emergency-Stop functions.

Clever Mounting and Connection Increases Economy

The spacer – saving time and expense

Using the standard mounting rings, all the switches are easily positioned at the same front height, so individual preparation of spacers is not necessary.

The result is a fast and cost-effective alternative to the door coupling rotary handle with extension shaft for external operation of the circuitbreaker. This innovation gains time and saves expense.

The terminations

Whether you are using copper or aluminium cable, copper strip or copper busbar, the NZM has the appropriate connection for them all. For example, the box terminal on NZM 2 and 3 can be opened at the top to facilitate insertion of conductors. An add-on shroud achieves IP20 degree of protection (finger-proof).

Innovative switching technology

Innovative switching technology with a double-break contact system speeds up the switching process. In the event of a short circuit, the special shape and materials selected produce repelling magnet power that pushes the contacts apart in a fraction of a sine wave. Switching capacities up to 150kA and operational voltages up to 690V can be managed without difficulty. The simultaneous reduction in heat dissipation creates benefits for use in control panels.

Product information Innovations with the circuit-breaker NZM (602KB)

Sample Specification for NZM circuit breakers (27KB)

This page last updated: 4 February 2008