A modern option for the classic ABB series A, AE and AL block contactors

The well-known legacy ’A’ series of 3 and 4 pole block contactors are moving steadily toward retirement with the initial phase-out beginning in the early 2000, the phase-out accelerated in 2011. Originally introduced as a similar option for the ASEA B series, the A series became popular when ASEA and ABB amalgamated.

With a wide range of options available the A series were generally supplied as conventional block contactors for A.C. operated coils, the AE versions, fitted with standard double wound D.C. coils and the AL versions typically fitted with low consumption D.C. coils. Aside from the main range, there were other additions for specific utilisation purposes such as the TAL or TAE ranges which, for instance, had a wide coil operating voltage range for traction applications.

The mentioned legacy ranges can all be replaced with a single series: the AF family.

Modern Motor Protection and Control

Introduced in 2015 the AF family have established themselves as a modern industrial benchmark and after both the 3 and 4 pole ranges underwent a final upgrade, they became the driving force in a continuing development program.

The ‘AF’ family benefits from having four common A.C/D.C coil voltages which cover all the standard operating voltages, built-in surge suppression with a wide range of connection possibilities.

Main Features

• Up to 560 kW – 400 V AC-3 IEC, 900 hp – 480 V UL/ CSA, plus 2650 A – 690 V AC-1 IEC, 2700 A UL/CSA-general use
• 4 coils cover 24 V – 500 V AC and 20 V – 500 V DC
• Screw, push-in spring and ring terminal connectivity
• Built-in surge suppression, no additional protection required

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The future for the Legacy ‘A’ Contactor and the associated accessories.

While there is a small proportion of accessories, the majority of spares and accessories have been run down due to either a shortage of components or increased demand. In particular, popular spares such as operating coils, surge suppressors and pneumatic timer blocks, are no longer available.

Although technically both the legacy A range and the new AF range are similar, they are physically different and accessories are not interchangeable. This is particularly important where star-delta starters or reversing starters containing mechanical interlocking is employed.

Due to the nature of the upgrade, there is sufficient time for those still using the legacy ‘A’ series to familiarise themselves with the ‘AF’ family and begin to make adequate preparations for the future phase-out.

Here at Kempston Controls, we will continue to stock the legacy ranges until they become depleted. We do however suggest that it would be in the interest of anyone utilising the legacy A range to prepare themselves for the future by being aware of the new ‘AF’ family.

To ensure that compatibility issues concerning the new AF range are addressed, please call our Technical Help desk for essential product information and to advise the most suitable upgrade. Our friendly team is reachable via phone: 01933 411411 or through email: technical@kempstoncontrols.co.uk.

For reference please see below the current status of the current AF series and previous models.

Blue is Active Range
Yellow is Classic
Black is Obsolete

Please note that ranges in the Classic Ranges may not have all coil voltages available. To discuss your requirements please contact our technical team

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Kempston Controls is committed to finding you the ideal solution for your application. Call us today on +44 (0) 1933 411 411, email us at sales@kempstoncontrols.co.uk, or alternatively contact us here, we will be happy to help.