 |
| Powered by phpBay Pro |
Can anybody explain me Why two shunt trip coils are used in HV/MV circuit breakers? Is it used as a backup?
Overload, Short circuit and earthfault trip signals can be given to a single trip coil..why do we need two trip coils? I dont think the second trip coil is for backup..there is some specific reason..If anybody knows please explain me..
In the applications I have seen (as a power engineer for 40+ years) the rationale for multiple trip coils in HV/MV breakers was always reliabillity. HV/MV breakers relay on stored energy (in a station battery) for tripping power. There is a subset of protection technology that is concerned about "breaker failure", and the way to address that problem is with redundant relays, redundant station batteries, and redundant trip coils.
|
 NEW SQUARE D MHL MHL3610001386 1000 AMP BREAKER SHUNT  US $2,500.00
|
 SQUARE D PAF PAF361200 1200 AMP 600V SHUNTAUX BREAKER US $2,495.90
|
 NEW SQUARE D LI LI365001380 LI36500 AUX SHUNT BREAKER US $2,400.00
|
 SQUARE D BREAKER PAF361200 PAL362000 shunt trip 1200 A US $2,250.00
|
 New Fuji Circuit Breaker BU JSA3250 w 24 Volt DC Shunt US $2,250.00
|
 Square D LX364501380 Breaker 450 A Shunt Tr AuxSw NEW US $2,180.00
|
 ITE SIEMENS MXD MXD63B800 3 POLE 800 AMP SHUNT BREAKER US $1,075.99
|
 Square D Obsolete Shunt Trip NA11021 New for NC NE NX SNA SNC Circuit Breaker US $1,075.00
|
| Powered by phpBay Pro |