Manual Part 5

BFU-21
3.2 Circuit Breaker
The circuit breaker disconnects the batteries if the current becomes too h igh.
It can also be manually operated on the front of the BFU-21 to connect or
disconnect the batteries from the DC distribution.
3.3 Shunt
The shu nt is used to sense the input current. The SM senses the value, w hich
is used for control of the BFU-21.
3.4 TM and EC Supply
There are two TM outputs for supply of transmission equipment and one EC
output for priority supply of the Control Board in the ACCU.
4 Interf aces
The BFU-21 has the following interfaces:
• Battery
• RBS DC distribu tion
• TM1 s upply 15 A
• TM2 s upply 15 A
• EC su pply 2 A
• EPC bus
5 (8)
EN/LZT 720 0234 Uen R2A