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Eaton has introduced Memshield 3: a new generation of final distribution boards and associated circuit protection devices for commercial, industrial and public buildings.

Memshield 3 forms a vital element of the company’s Powerchain Management solutions, which offer an integrated approach to the efficient distribution and control of electrical energy in buildings, from the main supply intake to the point of use.

It retains all the features of Memshield 2 but introduces features that will enable specifiers and installers to offer an even wider range of power distribution solutions in modern buildings.

In particular, 125A Type B boards are now offered with a 250A option in the larger sizes, while 250A boards can be used instead of MCCB panel boards for some applications.

Memshield 3 distribution boards are offered in Type A (single-phase) and Type B (three-phase) versions with up to 24 outgoing TPN ways.

Single-pole and triple-pole miniature circuit breakers, available in ratings up to 63A, have a 10/15kA short-circuit rating (10kA to IEC 60898 and 15kA to IEC 60947-2).

Previously, these devices were offered as two separate ranges with 10kA and 15kA short-circuit ratings.

Memshield 3 RCBOs are offered in a choice of trip sensitivities, from 10mA to 100mA, and have a 10kA short-circuit rating to IEC 61009.

Type A distribution boards are now offered with a higher-rated 125A switch disconnector incomer in five sizes from four to 16 ways.

They embody a number of special safety features including full-form blanking modules for unused ways (which also provide the secure shrouding of unused busbar stabs) and fully shrouded neutral busbars.

The main busbar assembly can be removed to facilitate installation.

An optional coupling kit allows two Type A boards to be linked together vertically to increase the number of ways.

Type B boards come in two ratings – 125A and 250A – with up to 24 outgoing TPN ways.

Memshield 3 also features new 250A Type B ‘High Load’ distribution boards.

Two of the outgoing TPN ways are designed to accommodate larger – 80A, 100A or 125A – miniature circuit breakers.

This means that the boards can handle larger individual loads or even feed additional distribution boards; a 250A Memshield 3 board can sometimes be used in place of the more expensive MCCB panel board to feed downstream boards.

Visually, Memshield 3 has a more modern styling than its predecessor, with rounded edges.

The boards are slightly larger to provide ample wiring space, even when using RCBOs to meet the latest requirements of the 17th Edition of the IEE Wiring Regulations.

Among the features retained from the Memshield 2 design is the welded end plate construction, which prevents the distortion of the enclosure when mounting on an uneven surface, even when the gland plates are removed.

Doors are removable, making it easier to fix the boards, and hanging the doors is easier because one hinge pin is longer than the other so that the two hinges do not have to be aligned together.

Another time-saving feature offered with Memshield 3 distribution boards is the availability of a Cable trunking interface kit for use when boards are mounted on cable trunking.

Contractors often make their own interface plates to protect the cables from the damage caused by the sharp-cut edges in cable trunking.

Eaton’s plastic interface can also be used as a template when cutting and drilling the trunking.

Separate transient voltage surge suppression (SPD) units, developed to meet the requirements of the new BS EN 62305 lightning protection standard, are included in the Memshield 3 range.

These provide Type 1/Type 2 protection as part of a coordinated solution.

Eaton’s Smart-metered split-load distribution boards, introduced earlier this year, are also offered in the new Memshield 3 styling, along with separate meter packs and Type A boards with integral metering.

These all help meet the energy conservation requirements of the UK Building Regulations Part L2 by providing the separate measurement of grouped lighting and power loads.

The Smart boards use a smart summing meter in conjunction with a high-integrity busbar with embedded voltage transducers.

This provides the separate measurement of the two grouped loads, plus total load.

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