Electricity and Control October 2021

SAFETY OF PLANT, EQUIPMENT + PEOPLE

At a glance  New surge protectors from P+F reduce the need for regular testing and limit process interruptions.  The surge protection system with built-in condition monitoring optimises plant availability and reduces maintenance costs.  A simpler model is also available for applications requiring only minimum specifications plus loop disconnect.

modules per function module block, loop separation, and 6.2 mm width with single-loop integrity is unique on the market.

Surge voltages can damage electronic components and pose a risk to plant availability. not cause a signal interruption. The signal circuit is closed without interruption via the base module at the moment when the connection between the signal circuit and the protection module is no longer established. A protection module can therefore be replaced without affecting plant operation. An additional loop check is not necessary. However, if the signal circuit needs to be intentionally interrupted – for isolation tests during commissioning or in recurring tests – the protection module can simply be rotated by 180 degrees and plugged in. In this case, the signal circuit is interrupted by an integrated isolating function. This allows the module to replace terminal blocks in the cross connect level with no additional space required. This combination of condition monitoring, more than 100

Terminal block with surge protection Pepperl+Fuchs developed the M-LB-2000 for applications requiring only minimum specifications plus loop disconnect. It has a form factor similar to that of the M-LB-5000 and is designed to be attached directly to the DIN mounting rail. The main differences are that the module cannot be diagnosed or replaced without interrupting the signal line. A loop disconnect function is achieved when the module is plugged in via two easily accessible switches on the front. The M-LB-2000, also just 6.2 mm wide, saves space in the switch cabinet and practically replaces the terminal block with surge protection. This means disconnect terminal blocks are no longer needed, saving costs. The certificates include ATEX, IECEx, Zone 1 and SIL 3. □

For more information visit: www.pepperl-fuchs.com

Electricity + Control OCTOBER 2021

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