4 Chapter 1 Introduction
NetSure 801 AG1 Power Supply System User Manual
HOD
LOD
Battery II
Battery I
Load I
Battery III
Fuse unit
Battery distribution unit
Power indicator
SM DU monitoring board
DC positive busbar
Alarm indicator
Figure 1-6 PD48/2000DU DC distribution cabinet (panels removed)
DC distribution cabinet is composed of DC distribution unit and battery distribution unit. See the following descriptions
for details.
DC distribution unit
1. High ohmic distribution unit (HOD)
Dimensions (unit: mm): 132.5 (H) × 584 (W) × 250 (D)
Weight: 9.3kg
Rated current: 200A
The rated current of the MCB is 16A, and the breaking capacity is 10kA. A high ohmic resistor is series connected to
each MCB route. It is recommended that the load current be smaller than 70% of the rated current, that is, 10A. Every
two MCBs can be parallel connected to form a larger power distribution circuit through adding high ohmic resistor and
connection terminals, so as to conduct up to 20A current. The cable cross-sectional area (CSA) of a single circuit
should be at least 4mm
2
.
Each HOD can be equipped with at most thirty-five MCBs of which the width is 13mm and the capacity is 16A. Each
MCB is series-connected to a 40M
Ω resistor, as shown in Figure 1-7.
Load MCB
(a) Front view
