Electrical Connections—UPS

3.2.7Accessory Fuses and Backfeed Breaker Wiring

Two fuse blocks provide power for the backfeed breakers (standard) and the BDSi (optional). See Figure 11 for fuse holder locations.

The backfeed breaker fuse block provides 120V nominal provided from the UPS output (L-N) and the fuse is rated for 8 amps. Figure 12 shows the backfeed breaker wiring.

The BDSi fuse block provides 208V nominal from the UPS output (L-L) and the fuse is rated at 8A. The BDSi power wiring is shown in Figures 23 and 46.

Figure 11 Accessory fuses

Backfeed

Breaker

Fuse Block

BDSi Fuse Block (optional)

Figure 12 Dual input backfeed breaker wiring when bypass distribution cabinet not used

Upstream Bypass Breaker

To UPS

Bypass Input

J11 on UPS

Bypass Module

Upstream Rectifier Breaker

To UPS

Rectifier Input

J10 on UPS

Bypass Module

Backfeed Breaker

Fuse Block

Auxiliary contacts not needed for backfeed breaker operation

UAM04030

Rev. 1

NOTE

Shunt trips are required in upstream breakers to allow backfeed protection to function properly.

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Emerson 115-120, 115-208 Accessory Fuses and Backfeed Breaker Wiring, Backfeed Breaker Fuse Block BDSi Fuse Block optional
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115-600V, 115-208, 115-120, 115-50/60HZ, 115-480 specifications

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