Product Recall on AC30 Portable Load Units

ac30 portable load bank

In 2019 our Quality and Engineering teams became aware of a potential issue with some AC30 Portable Load Units.

Fortunately, our records were able to identify all customers who had purchased units deemedat risk and a systematic process of recall, rectification and return to Customer was initiated.  This will be completed by the end of 2019.

For further information please contact


ZORC™ produce a range of unique high-frequency transient overvoltage surge suppressors for the protection of motors, transformers, generators and filter banks from steep wave-front, short rise-time, high magnitude, spikes, surges and other transient voltages, generated by switching and certain other sources.

The protective characteristics of ZORC™ provide comprehensive insulation coordination with both the CiGRé and IEEE motor impulse voltage withstand characteristics at all practical surge magnitudes and rise times.

Overvoltages are not only related to atmospheric impulses, in reality faults and damage can often be caused by other overvoltages such as switching overvoltage, transient recovery voltages and iron-resonance overvoltages. Good reasons to consider the installation of the ZORC™ surge suppressor.

Key Features:

  • Saves money by eliminating production downtime due to insulation failure.
  • Protects motors, generators and transformers throughout their service life.
  • Eliminates multiple pre and re-strike transients associated when switching on or off with vacuum and other switchgear types.
  • Standard and intrinsically safe models available.
  • Three and single phase

Product Functions:

  • System Voltage: 3 phase 400V to 13.8kV with single phase at 15kV
  • Transient protection: 0.1 to 0.2 micro seconds range
  • Special compact versions that can be fitted within most motor/transformer terminal enclosures or switchgear panels
  • RC single phase units available from 24-40KV

Applications for motors include:

  • Fans
  • Compressors
  • Conveyors
  • Generators
  • Crushers
  • Motor-generator sets
  • Pumps
  • Mills
  • Mine winders
  • Mini and mobile substations
  • Power station auxiliaries

Other Applications include:

  • Induction and arc furnaces
  • Mini and mobile substations
  • Dry type transformers
  • Refrigeration machines
To find out more about these new surge suppressors and how they can help you secure your electrical installations from damaging overvoltages, download our new data sheet  or contact Cressall today.


Cressall, has released an informative infographic explaining the essential questions to ask when designing an enclosure.

The guide aims to support design engineers as well as resistor end users across all industries to understand the requirements of their power resistor enclosure.

The infographic is now available to download here.

Power resistor enclosures provide a number of functions, including protection from harsh weather conditions, cooling and preserving the safety of the public. Each of these specifications will vary, dependant on the exact requirements of the client, and the resistor they purchase, however a full understanding is crucial to the design phase.

The research stage is usually undertaken when thecustomer provides an initial specification, but on some occasions, this does not happen, therefore it is the manufacturers responsibility to ask those important questions.

The infographic explains five questions that must be answered in order to design and manufacture an effective enclosure that meets all the required specifications. These queries cover the final resistor environment, industry challenges, aesthetic considerations, health and safety and choices around shipping and installation. By thinking about these points early, the final product can be designed to meet each and every requirement.

“We produced this infographic to provide design engineers, as well as the end user, a checklist of things to consider when they are planning their resistor and corresponding enclosure,” said Andrew Keith, engineering director at Cressall Resistors.

“Sometimes enclosures can be left as an afterthought, but this will rarely achieve the most efficient, advantageous solution. Thinking about the enclosure at the same time as designing the resistor is crucial to ensuring the final product will meet all the requirements, reducing the risk of compromises having to be made.”

Cressall works with clients worldwide to design and manufacture a range of resistors alongside enclosures, including dynamic braking resistors (DBRs), neutral earthing resistors (NERs) and harmonic filters. The full range includes specialised resistors for a number of sectors including rail traction, renewables, marine and offshore.



Cressall has produced an infographic that explains the reasons why consumers are sceptical about electric vehicles, and how the industry should respond to this reluctance. By supporting design engineers to increase their understanding of consumer concerns, Cressall hopes the industry will be able to overcome many of the challenges it faces.

electric vehicle concerns

The infographic is available to download now.

Electric vehicle manufacturers are faced with a range of challenges, including the requirement for more advanced battery technologies. In addition to technical demands, consumer uncertainty is also hindering sales.

The concerns cited by consumers include a short driving range, limited heating and air conditioning and a lack of charging points. Each of these can be improved or overcome by careful design engineering.

For example, driving range can be increased by using regenerative braking to recapture energy that would ordinarily be lost through friction braking.

“By having an acute awareness of the concerns that are making consumers reluctant to buy an electric vehicle, design engineers can ensure their vehicles are more marketable and saleable,” explained Simone Bruckner, Managing Director at Cressall.

“Increasing electric vehicle sales will not only be profitable for manufacturers but will also have beneficial effects on the environment. According to The Guardian, a hybrid vehicle that uses regenerative braking produces 42g less CO2 per km than the equivalent petrol vehicle.

“In addition, electric vehicles are much more efficient and with government incentives such as bursaries, they can be a more cost-effective option for many consumers.”

Cressall’s EV2 advanced modular water-cooled resistor is specifically designed for hybrid and all-electric vehicles. It’s an essential component in the regenerative braking process, discharging any excess energy in case of the battery being full, an electrical fault or an emergency situation.