Histor
Electrical
- Mar 2, 2022
- 70
I have a main UPS power DB with ELR (500mA). This main DB-01 feeding control supply to some PLC,VFD and a Sub UPS DB-02.
The Sub UPS DB-02 has multiple outgoing circuits with MCB and RCCB (300A) in each circuits.
Suddenly my UPS main DB-01 tripped by ELR. No RCCB tripped in sub UPS DB-02. How come ELR tripped before RCCB in sub DB?
The Sub UPS DB-02 has multiple outgoing circuits with MCB and RCCB (300A) in each circuits.
Suddenly my UPS main DB-01 tripped by ELR. No RCCB tripped in sub UPS DB-02. How come ELR tripped before RCCB in sub DB?