M-LB-4000 two-stage surge protector
Pepperl+Fuchs' new M-LB-4000 surge protection system integrates several functions - modularity, loop disconnection and signal line fault monitoring - to SIL 3 (based on the IEC/EN 61508 standard). The device limits induced transients on signal lines from a variety of causes, such as lightning strikes or switching operations. The dual-channel module supports higher device availability: no rewiring is required for replacement, as the protection functions are fully integrated in the plug-in protection module.
Picture caption: The two components of the fault status module, each of which is external, monitor the status of the surge protection module. There are two blocks for intrinsically safe circuits and signals from/to the safe area.
The M-LB-4000 consists of two blocks of surge protection and a two block fault status monitoring system.
The protection module contains all protection components. The basic module can be replaced without tools while it remains operational. A status indicator is located on the front panel of the unit. When the protection module is disconnected, the relevant signalling circuits remain interconnected via the basic module on the DIN mounting rail. The disconnection process does not cause any signal interruption, which means that the protection module can be replaced without affecting the operation of the device.
The M-LB-4000 has a loop disconnect function that facilitates commissioning and maintenance and enables the protection module to be replaced without interruption during operation.
If the protection module is rotated by 180° and inserted, the signalling loop is disconnected via the integrated isolation function. This simplifies maintenance and circuit checking and allows insulation tests to be carried out during commissioning or repeat testing.
The two components of the Fault Status Module monitor the status of multiple surge protectors. The kit consists of two parts: an optical transmitter/receiver and an optical deflector. If one of the surge protectors to be monitored fails, the optical signal is interrupted and the fault is recognised. The Fault Status Module has LED status indicators that allow a visual check of the surge protection to fulfil the specification requirements for periodic testing. Status information can also be output to identify the block in which the fault has occurred. Up to 50 modules can be monitored by one fault status module.
The modules are only 6 mm wide, saving space in the switchgear. During retrofitting, it is possible to replace the existing common isolation terminal blocks without regard to space requirements...
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