GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 9)

8
GEH-702 Users Manual
Termi al
escrip
CTB
-Pi
arness
CTB C
-Pi
arness
CTB C
-Pi
arness
POWER (+24Vdc) X X X
POWER (common) X X X
Communications + X X X
Communications - X X X
Aux Switch (red) X X
Aux Switch (white) X X
Voltage – Ph A X X
Voltage – Ph B X X
Voltage – Ph C X X
Neutral CT (black) X X X
Neutral CT (white) X X X
ZSI input + X
ZSI input - X
ZSI output + X
ZSI output - X
RELT input + X X
RELT input - X X
RELT output + X X
RELT/GFA output - X X
GFA output + X X
Equipment Interfaces
Equipment interfaces for Spectra microEntelliGuard™
breakers require special attention be paid to the
wiring harness arrangement on the circuit breaker
which depends on the features and functions that are
selected for the microEntelliGuard™ Trip Unit . The three
wiring harness arrangements are NO harness, 12-Pin
harness, and 20-Pin harness. Table 3 identifies the
harness arrangement based on the last four digits of
the circuit breaker catalog number.
Table 3. Harness Type Definition
Std.
Protect
Function
Adv.
Protect
Function
Adv.
Features
& Modbus
Example: SGHC3601…. L3 X X
No Harness L3 X X
20-Pin Harness L5 Any Any
20-Pin Harness Any
Z,T,R, L,M,N,
V,P,S,W
Any
20-Pin Harness Any Any 8
12-Pin Harness All Other Cases
Note: Find the last four digits of the breaker catalog number in the table to identify
the harness type.
Neutral Current Transformers
Neutral CT’s are required on breakers optioned for
neutral protection. Neutral CT’s are also required on
breakers optioned for Ground Fault/Ground Fault Alarm
where the system voltage is three-phase/four-wire or
single phase/three-wire. The list of available neutral
CT’s is shown in Table 4.
Table 4. Neutral CT’s
CAUTION: Neutral-current sensors are required for
three-phase/four-wire and single-phase/three-wire
systems. When the trip unit is connected to a three
phase/three-wire system, the neutral-current sensor
terminals are left open. Do not short any neutral-
current sensor terminals in a three-phase/three-
wire system, as this could result in damage to or
malfunction of the electrical system.
Terminal Blocks
Three different terminal block options are available for
Spectra microEntelliGuard
TM breakers. Breakers with a
12-Pin harness have one option for a terminal block
where breakers with a 20-Pin harness have two
terminal block options. The table below shows the
terminal descriptions for each terminal block catalog
number.
Table 5. Terminal Block Descriptions
Breaker
Type
Breaker Current
Sensor Rating (S)
Catalog
Number
SG
150
400
600
TSRG201
TSRG204
TSRG206
SK
800
1200
TSKG408
TSKG412
Connection to the neutral CT is made via a distribution
cable terminal block (three options) or a distribution
cable junction box (two options). Note: Terminal block
and junction box selection depends on the breaker
wiring harness, either a 12-Pin harness or 20-Pin
harness. Refer to Figure 1 for an example neutral CT
wiring connection diagram using a terminal block.
Terminal blocks are used for input and output
connections for multiple trip unit functions, metering,
and communications.