GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 10)

9
GEH-702 Users Manual
Description SDCJBB SDCJBBC
Breaker Harness (qty. 1) 12-Pin 20-Pin
Output Harness (qty. 2) 12-Pin 12-Pin
Aux Switch (red/white) X X
Neutral CT (black/white) X X
Communications X X
ZSI input +/- X
ZSI output +/- X
RELT input X
Prog Contact output +/- X
Prog Contact output +/- X
Figure 1. Typical Neutral CT Connection Using a Terminal Block
Distribution Cable Junction Boxes
Two different distribution cable junction boxes are
available for Spectra microEntelliGuard
TM breakers.
Breakers with a 12-Pin harness use catalog number
SDCJBB. Breakers with a 20-Pin harness use catalog
number SDCJBBC. The junction box serves as the
interconnection point between various shared input
and output signals, and also acts as the interface
between multiple breakers within a system.
Table 6. Junction Box Descriptions
The programmable contact output connections on
the SDCJBBC are dedicated if ground fault alarm and/
or reduced energy let-through features are optioned
in the trip unit . Otherwise, the output contacts can
be programmed to signal on various overcurrent trip
conditions and protective relays.
Power Supplies
An outside source of 24Vdc control power is required
for communications and waveform capture. Control
power is also required for programming the trip unit
under no-load or low-load conditions (less than 20%
of sensor rating). Control power connections to the
breaker can be made through the terminal block or the
distribution cable junction box. Five different power
supply plate assemblies are available. The power
supplies are rated 24 watts (+24 Vdc at 1.0 amps)
and have the capacity to power 20 Spectra breakers/
trip units over a length of 40 feet (total distance from
power supply to last breaker). The power supply plate
assemblies include the power supply, fuse protection
and a control power transformer for ac source voltages
over 240 VAC. All of these components are mounted on
a base plate. Table 7 lists the available power supply
plate assemblies. Figure 2 shows a typical power
supply connection using a terminal block.
Table 7. Power Supply Plate Catalog Numbers
Cat. No. AC Source Rating
SPSAl20 120 Vac, one-phase input & one neutral input 1
SPSA208 208 Vac, two-phase inputs
SPSA240 240 Vac, two-phase inputs
SPSA480 480 Vac, two-phase inputs 2
SPSA600 600 Vac, two-phase inputs 2
1. Fuse protection on one leg only.
2. Contain a control power transformer to step the voltage down.
The power supply used in the power supply plate
assemblies is available as a stand-alone component
(catalog number SPSAA) and requires an 85-240 Vac,
60 Hz input.