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5.4 Battery Circuit Breaker Box
The box contains the same battery isolating circuit breaker as mounted in the battery cabinet.
Two battery circuit breaker boxes are available for use in installations where the battery is not
installed in the battery cabinet, in which case the appropriate battery box is fitted as close as possible
to the battery and connected to the UPS equipment as illustrated in Figure 27.
The battery circuit breaker box, is required to protect the battery from overcurrents. It also provides
electrical isolation between the UPS and the battery, permitting technical service personnel to reduce
the risks involved in maintenance work to a minimum.
A separate safety earth must be connected between the UPS unit and circuit breaker box.
Two boxes are available depending on the UPS power rating.
The circuit breaker has the following features:
• Short-circuit protection.
• Protection against battery cabinet and ups connection errors (polarity reversal +/-).
Table 7 Available battery circuit breaker boxes
UPS
Dimensions (in)
H-W-D Circuit Breaker
10-15 kVA 32.25x20.25x8.3 70A
20-30 kVA 32.25x20.25x8.3 125A