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Application Guide 

Three Phase Sectionalizer 

 

 

www.Entec-USA.com

 

 
Solution 3

 

UTILITY VOLTAGE RESTRAINT WITH DOWNSTREAM RECLOSER 

 

Customer Fault:  Customer recloser cycles to clear fault and locks out, Voltage Restraint blocks 
LBS count … PME and Utility Feeder remain energized 

 

 

 
Solution 4 

INDUSTRIAL VOLTAGE RESTRAINT WITH DOWNSTREAM RECLOSER 

 
Zone A Fault:  RX1 cycles to clear fault and LBS locks out … critical SWD continues. 
 
Zone B Fault:  RX2 cycles to clear fault, Voltage restraint blocks LBS count … RX2 locks out 
and critical SWD continues. 

 

 

Summary of Contents for Load Break Switch

Page 1: ...Version 1 0 Application Guide www Entec USA com Date June 2018 Load Break Switch Three Phase Sectionalizer With SEL 751 Patent Pending Control Technology ...

Page 2: ...n a feeder behind multiple curves having tight coordination Single phase damage is avoided with a three phase sectionalizer making it superior versus fuses When operated all three phases simultaneously open Without a time current curve sectionalizers placed between reclosers and fuses provide additional points of separation for strategic isolation Using state of the art voltage restraint the LBS s...

Page 3: ... Entec USA com Solution 1 HIGH FAULT ISOLATION Branch 1 Fault 52 Breaker cycles and LBS locks out Utility Feeder remains energized Solution 2 PME PROTECTION IN HIGH FAULT ZONE PME Fault 52 Breaker cycles LBS locks out Utility Feeder remains energized ...

Page 4: ...s to clear fault and locks out Voltage Restraint blocks LBS count PME and Utility Feeder remain energized Solution 4 INDUSTRIAL VOLTAGE RESTRAINT WITH DOWNSTREAM RECLOSER Zone A Fault RX1 cycles to clear fault and LBS locks out critical SWD continues Zone B Fault RX2 cycles to clear fault Voltage restraint blocks LBS count RX2 locks out and critical SWD continues ...

Page 5: ...com Solution 5 PME PROTECTION WITH CUSTOMER RECLOSER PME Fault 52 Breaker cycles LBS locks out Utility Feeder remains energized Solution 6 NO COORDINATION REQUIRED Weak Fault Fuse won t coordinate RX2 cycles LBS2 locks out RX2 and Utility Feeder remain energized ...

Page 6: ...1 cycles LBS2 locks before LBS1 Zone 2 isolated Zone 1 and Main Line remain energized Solution 8 INRUSH RESTRAINT Fault Cleared Upstream RX cycles and LBS1 locks out Inrush Restraint blocks LBS2 Utility Feeder and LBS2 remain energized SEL is a registered trademark of Schweitzer Engineering Laboratories Inc SEL ...

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