Current-limiting circuit breakers
A
Rockwell Automation product story
Edited by the Engineeringtalk editorial team
May 5, 2000
New current-limiting circuit breakers from Rockwell Automation provide efficient protection for personnel, systems and cables.
Rockwell Automation announces the Allen-Bradley Bulletin 1492-SP miniature circuit breaker designed to protect equipment against the harmful effects of over current.
The 1492-SP has the ability to interrupt short circuit currents within the first half cycle of the fault, substantially reducing the amount of let- through-energy.
The 1492-SP has a breaking capacity of 10kA (EN 60 898) and is available in fourteen current ratings from 1 to 63A.
Suitable for DIN rail mounting, it is available as one, two and three pole units, as well as single and three pole plus neutral.
Multi-pole units are connected internally and at the handle for simultaneous operation.
The robust trip-free mechanism prevents the device from being held in the "ON" position in a fault situation.
Wire terminals are clamping style, self-lifting, box lug and accept cables up to 25mm2.
Single pole units are just 17.5mm wide, whilst three pole and neutral units are only 70mm wide, keeping panel sizes to a minimum.
Accessories include a changeover auxiliary contact and trip contact (up to four variants can be fitted to each unit) and 1, 2 or 3 pole busbar.
The robust construction gives a long mechanical and electrical life to minimise maintenance costs.
The miniature circuit breakers are suitable for 230/400V AC and 24 /120V DC operation and can be supplied with trip characteristics to suit a wide range of applications.
Type B is suitable for domestic and commercial installations, Type C for commercial/industrial applications and Type D for installations with high inrush loads, such as power supplies, heaters and transformer primaries.
The Allen-Bradley 1492-SP is designed to substantially reduce the amount of let through current and energy that can harm protected components due to excessive heat or mechanical damage.
Both of these factors are related to the square of the peak current.
Limiting the amount of energy that is let through provides a number of important benefits.
The speed and accuracy of the device means there is far less damage at the location of the short circuit.
Fast isolation minimises the risk of 'knock on' effects to other circuits.
Accurate protection means the unit can be used to back up other devices, without the risk of nuisance tripping.
The reduced stresses on the circuit breaker itself result in less wear providing an extended life.
The 1492-SP is designed and manufactured for world markets and meets European Standard EN 60 898 and International Standard IEC 60 898.
Its high performance, current limiting design, provides cost effective and efficient protection to personnel, systems and cables.
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