Date: 28/11/2023

Two-part surge protection system by Pepperl+Fuchs to safeguard your equipment

Pepperl+Fuchs has introduced the M-LB-4000 surge protection system that combines modularity, loop disconnect function, and fault monitoring for signal lines up to SIL 3 in accordance with IEC/EN 61508. This system effectively limits induced transients from various causes on signal lines, such as lightning or switching operations. The 2-channel modules also support higher plant availability by housing the protective function completely in the plug-in protection module, eliminating the need for rewiring during replacement.

The M-LB-4000 consists of a two-part surge protection and a two-part fault status monitoring system.

All protection components are housed in the protection module, which can be easily replaced without the need for any tools while the base module continues to operate. The front panel of the device features a status indicator. When the protection module is removed, the signal circuit remains connected through the base module that is mounted on the DIN mounting rail. This disconnection process does not cause any signal interruption, allowing for the replacement of the protection module without affecting the operation of the plant.
The M-LB-4000 facilitates effortless setup and maintenance through its loop-disconnect feature, enabling uninterrupted replacement of the protection module while the system is running.
When the protection module is rotated by 180 degrees and connected, the integrated isolating function will break the signal circuit. This simplifies maintenance tasks and loop checks and enables insulation tests to be conducted during commissioning or repeated testing.
The fault status module comprises two components that oversee the condition of various surge protection barriers. The kit is composed of an optical emitter/receiver and an optical deflection unit. In the event of a fault in any of the monitored barriers, the optical signal is disrupted, and the fault is detected. The LED status indicator on the fault status module allows for visual inspection of the surge protection, meeting the regulatory standards for routine testing. Furthermore, a status message output is accessible, allowing for identification of the block where the fault occurred. A single fault status module can monitor up to 50 modules.
The compact size of the modules, measuring only 6 mm in width, allows for efficient utilization of space within the switch cabinet. When it comes to retrofitting, the existing common disconnect terminal blocks can be easily replaced without any constraints related to space requirements.

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

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