Littelfuse Protection Relay Technical Note-Ground Check：GC-13 : SPLITTER-BOX DUAL-CABLE MONITORING WITH AN SE-135

PublishTime：2021-11-09

●An SE-135 Ground-Fault Ground-Check Monitor can protect the cables entering and leaving a dual-cable splitter box (junction box), when one is terminated with an SE-TA24A and the other with an SE-TA24B Termination Assembly. The SE-MUX was previously used to monitor two ground-check circuits by sampling each ground-check circuit every half second. As a result, ground-check trip times were increased by up to a half second. The improved method provides continuous monitoring of both ground-check circuits; therefore ground-check trip times are not increased, and the complexity of splitter boxes is reduced. Littelfuse recommends replacing the SE-MUX in splitter-box applications with an SE-TA24A and an SE-TA24B, as shown in Fig. 1.
●When an SE-TA24A and an SE-TA24B are used as a set, the parallel combination has the 12-V Zener characteristic required by the SE-135 as a valid ground-check-loop termination. An open or short in the ground-check loop of either cable will result in an SE-135 ground-check trip; no indication is provided of which cable is faulted.
●To be able to energize either single cable independently, a live-end cover fitted with an SE-TA24A or an SE-TA24B, as required, must be available at the splitter box.

Brand of Product：	Littelfuse
Part#：	SE-135 More Part#
Product Category：	Ground-Fault Ground-Check Monitor More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2020
Version Number：	Rev. 112018
Data Encoding：	TN-GC13
Data Size：	368 KB

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