Tech tip: CHI Control Components - Select the right MCB trip curve
Third Quarter 2007
Other technologies
Care should be taken in selecting the correct trip curve when specifying miniature circuit breakers (MCBs), especially for commercial or industrial premises where the use of fluorescent lighting, motors and other devices can result in significant inrush currents. The classifications - Type B, C and D - relate to the level of fault current that will produce 'instantaneous' operation (ie operation in less than 10 milliseconds).
* Type B devices: 3-5 times rated current. These are ideally suited to residential and small commercial applications where little or no switching inrush current is anticipated.
* Type C devices: 5-10 times rated current. These are suited to general commercial or industrial applications where low-level inrush currents may be present due to the use of fluorescent or other discharge lighting, small motors and similar devices.
* Type D devices: 10-20 times rated current. These devices should only be used in industrial and other applications where high-level start-up inrush currents are involved, for example with industrial welding equipment, large electric motors and X-ray equipment.
For more information contact Rob Hare, sales and marketing director, CHI Control Components, +27 (0)11 824 7400, [email protected], www.chicontrol.co.za
Further reading:
Next-generation motor management solution
Schneider Electric South Africa
News & events Other technologies
Schneider Electric has launched its TeSys Tera motor management solution in the West African market, combining advanced motor protection, digital connectivity and real-time diagnostics for manufacturing, mining and water applications.
Read more...
From concept to execution, unlocking renewable energy
Other technologies
Businesses already understand the benefits of renewable energy, however, as renewable energy solutions become more sophisticated, successful implementation requires a structured decision-making process that aligns technology choices with business objectives.
Read more...
Smarter, more secure electricity networks
Other technologies
As South Africa accelerates the rollout of smart prepaid electricity metering, innovative enclosure technology from PPS is helping utilities improve network security, reduce electricity theft and protect critical electrical infrastructure.
Read more...
Siemens launches SIMATIC AX WinCC Unified Elements
Pneumatic systems & components Other technologies
New engineering tool speeds automation application development, reducing the time required to bring industrial projects to market and empowering automation engineers to build, manage version control, and deploy visualisation engineering projects
Read more...
Decoupling software from hardware for future-proofed process automation
Schneider Electric South Africa
Other technologies
Legacy systems continue to perform admirably; the dilemma is that systems like PLCs, DCS (distributed control systems), SCADA and field devices were designed for deterministic, long-term operations.
Read more...
Duplex worm gears for precision backlash adjustment
Other technologies
KHK USA has introduced duplex worm gears that allow precise backlash adjustment through simple axial movement of the worm shaft, eliminating the need for gearbox housing alterations during assembly or maintenance.
Read more...
Corrosion solution for engine hot testing
Other technologies
Engine internals are at risk for corrosion from water used during hot engine testing and fill and flush activities. Corrosion affects the engine’s like-new appearance and threatens its integrity.
Read more...
Hygienic ultrasonic flow sensor
ifm - South Africa
Other technologies
The SU Puresonic Hygienic ultrasonic sensor from ifm detects flows of conductive and non-conductive media with high precision.
Read more...
Fault analysis for lifting equipment
Other technologies
Ensuring the sustained performance of capital equipment such as crane rails, ropes, hoist rails, gantry rails, and runway beams, which guide lifting equipment and support heavy loads, is essential for safety, reliability, and efficient operation.
Read more...
Bringing true mobile welding capability to SA agriculture
Other technologies
Bolt and Engineering Distributors has launched the new Fronius Ignis Battery. This is a next-generation, battery-powered welding system engineered for mobility, reliability and performance in off-grid agricultural environments.
Read more...
printer friendly version