
9
CT INPUTS
The Optimizer3 measures the current flowing through the bushing CT secondaries of the circuit breaker. These measurements are
used in the contact wear calculations, arc time, and determination of Fault versus Non-Fault operations. Line current is also logged.
During installation, small split-core Pickup Coils are attached to the relevant bushing CT circuits, noting the bushing CT turns ratio.
Depending on the maximum current expected in the bushing CT circuits, an optimal split-core Pickup Coil is selected. INCON® offers
split-core Pickup Coils with the following full-scale ratings:
Table 1
– Pickup Coil Ratings.
INCON® Part Number
CT-20
CT-30
CT-50
CT-100
CT-160
CT-250
CT-400
CT-800
Full Scale Rating (A)
20
30
50
100
160
250
400
800
Range (A)
1.4-20
2.1-30
3.5-50
7-100
11.2-160
17.5-250
28-400
56-800
Each “CT-nn” part number is for a set of three Pickup Coils. The Pickup Coils are compatible with 50 or 60 Hertz power systems.
The split-core Pickup Coils snap on over existing insulated bushing CT secondary circuits without tools and are rated 1.0 % accuracy
and 0.05 VA burden at 5 amps. Removal or disruption of bushing CT circuits is not necessary. Although referred to as a CT, these are
sensors that give 0-5 VAC output for 0 to Full Scale current.
CONTROL INPUTS
The use of each input is determined by the circuit breaker application and Mode of operation. Each control input is multi-function
and is defined in the system CONFIGURATION. The control inputs are continuously interrogated to detect when the control circuit
nodes are in the active or inactive state. Each AUX input is fused on both legs, optically isolated from the monitoring processor
circuits, and has an input impedance of 540 kΩ. The Off/On voltage threshold is approximately 35 volts.
Figure 3
– Power, Relay, Aux Input, Field Wiring
Power:
110–264 V AC/DC 50/60 Hz
Twisted pair recommended.
Relay Contact Rating:
NO: @ 250 VAC or 30 VDC
NO: @ 250 VAC or 30 VDC
48–250 VDC
Twisted pair
recommended.
AUX 5
AUX 4
AUX 3
AUX 2
AUX 1
GND
L1
L2
LOAD
LOAD
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