Responsibility for safe operations rests firmly in the hands of end users. However, panel builders and system integrators can increase their value by selecting components that simplify safety in complex industrial deployments.
Air circuit breakers (ACBs) are such a component and have a long history of protecting operators and equipment as the use of electrical power grew. In the wake of digital transformation, more advanced equipment is being deployed in both new and legacy facilities, as businesses strive for continuous operation. This has driven the need for ACBs that include intuitive safety features so that operators can complete preventive maintenance tasks safely.
Historically, panel builders and system integrators are well versed in the role of ACBs to control power while safeguarding equipment and operators from potential electrical hazards, and this is still true today. The impact of a system failure for the end user can range from lost profits all the way to a worst-case scenario employee health and safety incident, therefore the performance and reliability of a chosen ACB is paramount.
Panel builders and system integrators should seek solutions that can quickly detect abnormal electrical conditions and present information in real-time. For example, a unit that displays breaker health with one glance will be inherently safer than one without. The latest generation of ACBs are digitally connected so that operators can check their status and isolate them remotely if needed. However, not all facilities have digital infrastructure.
There is now an opportunity for panel builders and system integrators to build in ‘peace of mind’ in these cases, whether to address higher power loads due to new assets being added to a production line or to meet strict fire and safety protocols of critical facilities.
The latest advanced ACBs offer an option for superior protection from risk of arc flash for sites where operators need to work on or near panels when they’re live. This is achieved through a function called Energy Reduction Maintenance Setting (ERMS), which essentially provides push-button safety for operators.
When engaged, an ERMS button on the trip unit reduces the circuit breaker’s tripping threshold. This increases the controller’s sensitivity so that the breaker will open at the very first sign of a high energy fault. This early action significantly reduces the size and extent of a fault current.
The key to this functionality is the design of the trip unit. For example, Schneider Electric developed the MicroLogic Active as a special controller for its MasterPacT MTZ range of ACBs for installations that will require manual operations and in-person interventions. As well as providing ERMS, it displays breaker health in real-time using data from monitoring various functions.
The solution is ideal for legacy facilities and other sites where it’s not possible to deploy digitally-connected circuit breakers. It also supports preventive maintenance and improves business continuity.
Industrial projects are rarely one-size-fits-all, with panel builders and system integrators applying their expert knowledge to customise solutions to meet client specifications. Just as a real-time display is crucial for the end user, flexibility is a priority for the solutions provider. Partnering with the right technology provider means panel builders and system integrators will have a cost effective and configurable solution that meets the unique safety needs of every client, while continuing to add value throughout the lifecycle of a facility.
