Product category:
Machine Safety Monitoring and Control
News Release from: Moeller Electric | Subject: NZM1, 2, 3 and 4
Edited by the Engineeringtalk Editorial
Team on 14 April 2003
Novel breakers feature speedy switching
A new modular range of moulded case circuit breakers is packed with new features, including an unusual double break contact for switching.
A new modular range of moulded case circuit breakers from Moeller Electric is packed with new features, including an unusual double break contact for switching The units are easy to install, with a very compact footprint and have an optional data communications interface
This article was originally published on Engineeringtalk on 28 Aug 2003 at 8.00am (UK)
Related stories
MCCB comms interface cuts system downtime
Moulded-case circuit breakers with advanced communications capabilities from Moeller are setting new benchmarks for power distribution and automation applications.
Switch range suits safety applications
Moeller Electric T rotary switches and P switch disconnectors are suitable for use as main, maintenance and emergency-stop switches that can be locked in the off position with up to three padlocks.
Called the NZM1, 2, 3 and 4, the breakers are ideal for applications from cable protection to guarding motors and generators where fast switching is a benefit.
In the event of a short circuit, new switching technology ensures rapid protection by using repelling magnetic power to push the contacts apart in a fraction of the sine wave.
New materials and geometry combine to achieve not only the fast switching, but also a subsequent reduction in heat dissipation, which is an advantage when breakers are installed in control panels.
Further reading
Switchgear meets new building regulations
Metering can also be easily retrofitted to existing installations, avoiding the need for extensive refurbishment when systems are upgraded to meet Part L requirements.
Multifunction display saves space and money
The HMI can access PLC variables directly, avoiding the cumbersome tables of variables that are often needed when separate devices are used.
A reduction in the number of moving parts lengthens service life.
Evidence of the research and development that has gone into the new NZM range is the rationalisation of the mechanical design, with just four frame sizes of switch covering from 25 up to 150kA.
The breakers all use auxiliary contacts, taken from the existing and widely stocked Moeller RMQ-Titan range, which can be fitted very simply and quickly from the front of the breaker during commissioning.
There is also a common base plate for all rotary handles, reducing the number of different handles that may otherwise be required.
In short, the NZM range simplifies specifying and ordering and reduces spares stocking requirements.
Installation is quick and easy, thanks to features such as the ability to mount all accessories from the front of the units, uniform spacers that enable flush front mounting and a range of cable connections to suit any cable management needs.
One innovation that will appeal to systems designers is the ability to link the circuit breakers to other controls.
An optional data management interface allows the current, just prior to tripping, to be recorded and also enables identical configurations to be set quickly in series applications.
The breakers can be networked, using Profibus, to communicate fault, maintenance and diagnostics data with PLCs, HMIs and Scada systems.
This feature simplifies the management of complicated distribution systems.
Specialised applications, such as those where elevated temperatures are encountered, are covered by the breaker's ability to operate, without derating, at temperatures up to +50C.
For marine and offshore installations, the highest switching capacity of 150kA is suitable.
• Moeller Electric: contact details and other news
• Email this article to a colleague
• Register for the free Engineeringtalk email newsletter
• Engineeringtalk Home Page
Search the Pro-Talk network of sites
