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Building Products July 2017

INDUSTRY COMMENT JULY 2017 | BUILDING PRODUCTS 7 the ‘installed cost’ sense of the word that is really the important issue. The sheer versatility and flexibility of 415V products gives design engineers the scope to drive cost out of projects. For instance the compact dimensions of the 415V format provide space saving opportunities in equipment, reducing material costs in the process, while the comprehensive range of available ratings means a precise choice of rating can be chosen rather than one that is over-specified and hence more expensive. The 415V format fuses also come with a variety of mounting options - bladed or bolted tags – and generally are compatible with a wider range of ancillary products such as fuse holders and fused switches, again providing scope to achieve the optimum result in terms of system efficiency and cost. Typically 415V fuses are cooler running than their 690V counterparts with lower watts loss, hence less energy dissipated and increased system efficiency. Also, the applications for 415V are wide and varied, allowing greater scope for cost saving and system efficiencies. These include power distribution, cable protection, switched fuses and machine or equipment protection. Special motor rated fuses are used for industrial motor protection. While there may be some hesitancy about adopting 415V over 690V, and rest assured there are applications for which only 690V will do, there are compelling reasons to make that move. In fact such is our belief in that strategy that we have produced a cross-reference matrix to help and inform decision-making. The matrix allows the electrical engineer to find an equivalent fuse simply by entering the part number of the fuse that has operated. For instance, if the existing fuse carries the part number BTTM42V630 , made by Ferraz / Mersen , then by entering that, the matrix will provide the equivalent Bussmann series part number, FF630. By simply clicking on the part number shown, the user is then directed to a data sheet, where a full product specification is available. In addition there is a stockist locator facility so that by entering the postcode of where the work is taking place, suggested nearby stockists are shown. Another useful function that has been included is Ask the Experts, a reference library of technical content and topics. This is supported by an on-line service that allows any questions or queries to be answered by technical staff, particularly relevant for situations where the engineer might be considering swapping out a 690V fuse for a 415V alternative. The service also allows any general fuse enquiry to be dealt with or a literature request submitted. The cross-reference tool is available across all digital devices – PC, laptop, tablet and phone – and its responsive design means that whatever format is being used, the look, feel and functionality is optimised for the best results. By way of conclusion one could pose the question – is a reliance on habit or history the reason for specifying 690V fuses? If it is, then the answer may well be that we have to rewrite history and break old habits! Tony Garlinge-Warren is Senior Applications Engineer at Eaton


Building Products July 2017
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