URC AC-PRO-II Instruction manual

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
Page 1
This is an abbreviated “Quick Start” Manual.
For full version of AC-PRO-II Instruction Manual, visit:
http://www.utilityrelay.com/Side_Bar/Instruction_Manuals.html
Manual Revision 2.0 –November 2017
Table of Contents
Section: Page
1.0 Introduction and Product Overview..........................1
2.0 Commissioning the AC-PRO-II®................................2
2.1 Security Code...................................................2
2.2 Time and Date Setting......................................2
3.0 Rotating the Display..................................................2
4.0 Testing........................................................................3
5.0 Menu Navigation........................................................3
6.0 External Connections................................................4
7.0 QUICK-TRIP®System (optional)................................6
7.1 QUICK-TRIP®Basics & Operation....................6
7.2 AC-PRO-II QUICK-TRIP®Switch Mounting.......7
7.3 Remote QUICK-TRIP®Switch...........................7
7.4 QUICK-TRIP®Remote Indication......................7
8.0 USB Extension cable.................................................8
8.1 USB Extension Cable Installation......................8
9.0 Normal Operations & Readings................................9
10.0 InfoPro-ACTM Software Application...........................9
11.0 Firmware Versions and Updates...............................9
Appendix A –Time Current Curves (TCC) .....................10
Appendix A.1: Overload TCC...................................10
Appendix A.2: Ground Fault (GF) TCC.....................11
Appendix A.3: Neutral Overload (NOL) TCC ............12
Appendix A.4: QUICK-TRIP Ground Fault and QUICK-
TRIP Instantaneous TCCs..............................13
The AC-PRO-II®is a state of the art, micro-controller based
trip unit for use on three phase, 600 Volt class, AC circuit
breakers on 50 Hertz or 60 Hertz systems. The AC-PRO-II
features a rotatable 128 x 64 Multi-line, Organic Light Emitting
Diode (OLED) Display, smart buttons, and LEDs.
The standard AC-PRO-II features:
•Overload and fault protection
•RS485 communications
•QUICK-TRIP®arc flash hazard reduction ready
•Patented Sluggish Breaker®detection
•Time stamped trip history with waveform capture
•InfoPro-ACTM software interface
•Ready for SAFE-T-TRIP®hand-held remote trip device
•And many other features
Additionally, with the optional Voltage Divider Module (VDMTM),
the AC-PRO-II can provide Over/Under Voltage protection,
Phase Loss/Reversal trip & alarm (firmware v2) and power
calculations. The VDM provides continuous trip unit power and
RS-485 communications even when the breaker is open.
Figure A: AC-PRO-II Front View Horizontal Configuration
(See page 2 for Item descriptions)
1.0 Introduction and Product Overview
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Refer to Figure A on page 1 for items below:
A. Local Display (rotatable)
The Local Display is normally mounted to the trip
unit. It can be rotated or separated from the trip
unit for specific breakers where space is limited.
B. OLED Display
The display is normally off. Pushing the
“DISPLAY”button (C) turns on the display. The
OLED displays the following information. Refer to
Section 5.0 for menu navigation.
1) Power menu
2) Settings menu
3) Trip history menu
4) More Menu (Trip Unit info & Utilities)
5) Errors, alarms, and other messages
C. DISPLAY Push Button
Pushing the “DISPLAY”button will turn on the
display. If no buttons are pushed for 60 seconds,
the display will turn off.
D. Removable wire cover
Cover with printed connection labels. See Section
6.0 for external connections (behind cover).
E. “Smart” Push Buttons
These push buttons perform the functions
indicated on the bottom of the OLED display.
These buttons are used for all menu navigation.
F. RS-485 Line Termination Switch
This switch should be placed in the ON position
only if the trip unit is the last in the RS-485
communications wiring run.
G. Red PICK-UP LED
This LED will illuminate if the current exceeds the
LT pick-up setting.
H. Green OK (Self-Test) LED
When the trip unit is powered up, this LED is on
unless a problem is detected. If the trip unit is not
powered up, the OK LED will not be on. If the
“DISPLAY” button is pressed, the OK LED should
come on, unless a problem is detected.
I. Battery Cover
To replace the battery, remove the single screw
and slide battery cover out, remove the old battery
and insert a new CR2, 3-Volt Lithium battery.
Replace the battery cover and screw.
J. Mini-USB Port (shown with cover removed)
The electrically isolated mini-USB port is available
for connection to a laptop/ personal computer for
uploading & downloading of settings, information,
and firmware; SAFE-T-TRIP remote trip device
operation; or USB wall pack for auxiliary power.
K. COMM ACTIVE LED
The communications active LED illuminates when
the trip unit is transmitting information via
Communications.
L. AC-PRO-II Serial Number
M. Quick-Trip LED (red)
This LED will illuminate if a Quick-Trip switch is
connected and on the ON position.
Before the AC-PRO-II trip unit is put into service, it must first
be commissioned so it will function. This requires the user to
enter all of the pick-up and delay settings into the unit.
The commissioning process normally takes less than a few
minutes to complete.
The AC-PRO-II can be commissioned using the local display
screen, or using the InfoPro-AC software application.
If the AC-PRO-II has not been commissioned, it will display
“Enter settings before placing into service”. Pressing the
“SET” button at this screen will begin the settings process.
For commissioning using the InfoPro-AC software
application, see Section 10.0, and the InfoPro-AC help guide
included in the application.
**** IMPORTANT ****
The trip unit will NOT FUNCTION as it is shipped from
the factory. The user must first COMMISSION the unit as
outlined in this Section.
The security code is the last four (4) digits of the serial
number. See Error! Reference source not found. for
serial number location.
The time and date setting is accessed via the MORE menu,
by pressing the MORE button at the main screen, then the
time button, then the change button. The time and date
must be set after commissioning the AC-PRO-II or after
replacing the battery to ensure the time stamps (of trips and
on-demand waveforms) are recorded and are correct. In
order for the time and date to remain accurate after setting, a
fresh battery must be in place.
The AC-PRO-II trip unit consists of a main case and a
display case. The trip unit orientation can be modified by
rotating the display case. Refer to the AC-PRO-II retrofit kit
installation manuals for your breaker-specific trip unit
orientation.
To rotate the Display Case:
•The breaker must be out of service and de-energized
for safety.
•Ensure the person rotating the display is properly
grounded and takes special care to avoid static
discharge onto trip unit and display internal
components.
•Remove the black wiring cover by pulling the wiring
cover off the three (3) standoff posts.
•NOTE: the display case is connected to the main case
via the following:
oOne (1) Ribbon cable. See Figure B.
oFour (4) captive screws. See Figure A.
•Loosen the four (4) captive screws with a screwdriver.
•Leave the ribbon cable connected. Do not disconnect
the ribbon cable.
•Rotate the display to the position required for the
installation on the specific breaker. Be careful not to
damage, pinch, or disconnect the ribbon cable.
•Tighten the four (4) captive screws.
•Press the “DISPLAY” button and smart buttons to
confirm operation.
•Refer back to the AC-PRO-II retrofit kit Instructions for
additional breaker specific steps.
2.0 Commissioning the AC-PRO-II®
2.1 Security Code
2.2 Time and Date Setting
3.0 Rotating the Display

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
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Figure A: Display Case Screw locations
Figure B: Trip Unit and Display (separated)
A "primary injection" test is recommended as the final test of
the AC-PRO-II retrofit. If residual GF is used, it must be
temporarily turned off when testing the other trip functions.
Before proceeding with the normal primary injection tests,
the trip unit must be commissioned to make it functional. See
Section 2.0 for Commissioning information.
It is best to use the final pick-up and time delay settings if
they are known. If not, use typical settings for the primary
injection test.
Although primary injection testing is the preferred method to
test an AC-PRO-II installation, secondary injection testing
can also be used, using URC B-292 Test Set.
See Appendix A for Time Current Curves (TCC). For
additional testing information including instructions, and LT
Delay Testing Chart, refer to the AC-PRO-II Instruction
Manual. See the link and QR code in the Table of Contents
of this document.
AC-PRO-II settings and information can be navigated using
the push buttons on the face of the trip unit. Pressing the
“DISPLAY” button wakes the display up from its power
saving mode. After the display is on, all menu navigation is
accomplished using the screen prompts and (4) smart
buttons below the display. The smart button labels appear
at the bottom of the screen. See the list of menus and sub-
menus:
1) PWR (Power Menu): This menu provides access
to power values, which become available if the
optional Voltage Divider Module (VDM) is
connected.
2) SET (Settings Menu).
a. REV (Review Settings sub-menu): This sub-
menu allows review of all user settings without
the option of changing the settings.
b. CHNG (Change Settings sub-menu): This
sub-menu allows the user to change all
protection, alarm, and breaker information
settings.
c. TEST (Test Mode sub menu): This sub-menu
is for Testing convenience, AC-PRO-II offers a
“Test Mode”. When the AC-Pro-II is in Test
Mode, all Voltage Protection is temporarily
disabled, and the need to enter the Security
Code to change settings is temporarily
disabled. Though Test Mode is automatically
turned OFF after 60 minutes, it should always
be manually turned OFF after testing is
complete.
3) HIST (Trip History Menu): This menu provides
access to trip history information for up to eight (8)
trips.
4) MORE (Trip Unit Information Menu): This menu
includes serial number(s), time & date settings,
battery status, URC contact info, etc.
Press SET to access
the settings menu
Figure C: Settings Menu first screen
NOTE: Test Mode is an option with Version 2 firmware.
4.0 Testing
5.0 Menu Navigation
Display
Main Case
Display
Case
Screws
Ribbon Cable

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Page 4
6.0 External Connections
Alarm Relay
5A @ 120VAC
Limit Switch
GF
Defeat as 52a or 52b)Input
+
Actuator Phase A Phase B Phase C Neutral
-
RS-485
Voltage Divider Module (VDM)
(optional) mounted on back
A
Voltage Inputs
B C G
Current Inputs
24VDC
Aux Pwr
USB
Laptop / PC
SAFE-T-TRIP
AC-PRO-II Local Display Unit
USB Options
Optional Quick-Trip
Cable & Connectors
AC-PRO-II Typical Wiring Diagram
(Simplified Vertical Configuration)
Normal Power Flow
Phase A
Phase B
Phase C
Neutral
Breaker Harness Cable
Configurable
Indication, or
other function
Customer Alarm,
5A @ 24VDC
URC Breaker
(Configurable
1A Fuses
Breaker Harness Plug
+
-
SHLD
Breaker Cubical
Terminal Block
Optional RS-485
Cable/ Connector
Assembly. Maintain
proper polarity. Blue
wire is "+".
To next AC-PRO or
AC-PRO-II trip unit
RS-485
Comm.
Loop
Comm.
GND to
Breaker
frame
Quick-Trip
Connector
LOAD
+
-
SHLD
Do NOT use external
terminating resistors.
Wiring provided by Others
(#14AWG - #30AWG)
Secondary disconnects
Actuator
Neutral CT is optional.
Only for 4-wire
systems with Ground
Fault Protection and/or
Neutral Overload
protection.
WIRE CODE
R = Red
B = Black
W = White
Y = Yellow
L = Blue
N = Brown
G = Green
CL = CLEAR
BA = BARE
R B L W Y W N W G W
BA
L
CL
Optional Quick-Trip System
Phase CTs
#18 AWG type MTW
(Black)
Color code tape
or labels by
Others #14 AWG type SIS
(Gray)
USB Extension
USB Extension port
in switchgear door
3-Phase
Source
CT Configuration shown
allows for Residual
Ground Fault protection
and Neutral Overload
Protection.
(Cable by
Others)
updated August 2017
AC-PRO-II
Quick-Trip Switch
See Section
7.0 for Remote
QT Switch &
Indication
wiring
ON
OFF
QT ON
R
COMM
OK
PICKUP
R
R
R
Current Limiting
AC-PRO / AC-PRO-II
B-292 Test Set
Push
To
Verify
DISPLAY
Currents
Connector Actuator
Connector
12
1: +24VDC
2: GND
VDM taps on line side of breaker.
If using Phase Loss (for blown fuse
condition on a fused breaker), tap the load
side of the fuses. See full manual Section
8.0 for additional important information.
QT
Comm. location
(special units only)
Alternate RS-485
Typical RS-485 twisted
pair comm. cable by
others.
or Neutral CT connector
(recommended if available)
Secondary
disconnects may
also be used if they
are dedicated to the
AC-PRO/AC-PRO-II
RS-485 Network.
Figure D: AC-PRO-II Typical Wiring Diagram

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
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POWER
PWR SET HIST MORE
SETTINGS
REV CHNG EXIT
CT TAP
CT SEC. RATINGS &
POWER FLOW DIRECTION
LT SETTINGS
ST SETTINGS
INST SETTINGS
GF SETTINGS #1
QUICK TRIP SETTINGS
OV ALARM
ALARM RLY SETTINGS 1
ALARM RLY SETTINGS 2
RS-485 SETTINGS 1
CT TAP
CT SEC. RATINGS &
POWER FLOW DIRECTION
LT SETTINGS
ST SETTINGS
INST SETTINGS
NEUT OVERLOAD SETTING
GF SETTINGS #1
QUICK TRIP SETTINGS
ALARM RLY SETTINGS 1
ALARM RLY SETTINGS 2
LIMIT SWITCH SETTING
SECURITY CODE
VERIFY SETTINGS
MAIN
("READINGS" SCREEN)
RS-485 SETTINGS 1
MENU NAVIGATION MAP
Rev Clear More Exit
TRIP HISTORY SCREEN 1
TRIP TYPE, DATE, TIME, #
Util Time Exit More
TRIP UNIT INFO (S.N. & F/W)
TRIP CURRENTS & VOLT.
BKR MECHANISM TIME
CONFIRM
NEUT OVERLOAD SETTING
Rev
TRIP HISTORY
SCREEN 2
URC CONTACT INFO
SIMPLE VIEW
Clear
TIME & DATE
CHANGE TIME & DATE
ALARM RELAY RESET
LOCAL DISPLAY INFO
KEY SETTING / SCREEN WILL APPEAR IF VDM MODULE IS CONNECTED.
UV TRIP UV TRIP
LIMIT SWITCH SETTING
SETTINGS SAVED
REVIEW
ADDITIONAL TRIPS
SLUGGISH BKR SETTINGSLUGGISH BKR SETTING
RS-485 SETTINGS 2 RS-485 SETTINGS 2
OTHER SCREENS
NO PROTECTION - INTERNAL ERROR
NO PROTECTION - ACTUATOR OPEN CIRCUIT
UN-CALIBRATED
UN-COMMISSIONED
TRIP
SLUGGISH BREAKER
OVERVOLTAGE
UNDERVOLTAGE
NOTE: THIS IS A TYPICAL MAP. SCREENS & SEQUENCES VARY
DEPENDING ON ORDER CODES AND SETTINGS.
SETTINGS
REVIEW
SEQUENCE
KW, KVA, PF
KWHr, KVAHr
BATTERY TEST
FALL 2017 FW 2.0
UV ALARM
OV TRIP
OV ALARM
UV ALARM
OV TRIP
PHASE LOSS/REV PHASE LOSS/REV
GF SETTINGS #2 GF SETTINGS #2
ALARM RLY SETTINGS 3 ALARM RLY SETTINGS 3
SETTING / SCREEN WILL APPEAR IF VDM MODULE IS CONNECTED
AND UNIT HARDWARE IS CAPABLE OF PHASE LOSS PROTECTION.
****
********
TEST
L-L VOLTAGE REMINDER
BREAKER STATUS
GROUND FAULT
PHASE LOSS/REV ****
Alrm Batt GFT Exit
GROUND FAULT TEST
ALARM SCREENS
BKR POSITION ERROR
TEST MODE
FREQUENCYFREQUENCY
BREAKER STATUS WILL
APPEAR IF LIMIT SWITCH
SETTING IS 52A OR 52B
Figure E: Typical AC-PRO-II Menu Navigation Map - Simple View
1st Screen if
Under CT Power
1st Screen if on
Battery Power

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Page 6
on back of
Plug into
QT Switch
"QUICK-TRIP
Plug into Jack
with QUICK-TRIP turned ON
Red LED is "ON"
Connector"
AC-PRO-II
Push
To
Verify
Quick-Trip ON
Quick-Trip OFF
Quick-Trip ON
Quick-Trip Switch
Arc Flash Hazard Reduction Switch
R
TM
(only for use with AC-PRO-II trip unit)
Lockable Guard
Note: QUICK-TRIP Switch
cable
4/C QUICK-TRIP
is not shown
Optional Customer
Wiring & Devices
Remote ON/OFF
Switch
Remote
Indication
120VAC 0.5A
Terminals on back of
AC-PRO-II QT Switch
Closes if QT Switch is on
ON position or if 120V
applied to Remote
switch terminals
120VAC +/- 15%
120VAC
L
N
L
N
AC-PRO-II QUICK-TRIP System and Connections Aug 2017
USB
AC-PRO-II
COMM
OK
PICKUP
DISPLAY
QT
Figure F: QUICK-TRIP System and Connections
The QUICK-TRIP system is a manually controlled arc flash
hazard reduction system. It can reduce trip times when
turned on and allows selective coordination between circuit
breakers when turned off.
If maintenance personnel must work on energized
equipment, they will first turn the QUICK-TRIP system on at
the upstream breaker feeding the equipment or breaker. If a
fault now occurs, the upstream breaker will trip quickly based
on the QUICK-TRIP settings reducing the Arc Flash
Hazard to personnel.
When the maintenance work is finished, the QUICK-TRIP
system is turned off and the original selective coordination is
back in effect.
The QUICK-TRIP system consists of the following
components:
1) AC-PRO-II trip unit.
2) AC-PRO-II QUICK TRIP Switch:
(URC Part #QT2-SWITCH) consisting of Padlockable
QUICK-TRIP On/Off toggle switch, QUICK-TRIP On
LED, Push-to-Verify button, Remote Switch Terminals,
and Remote Indication Terminals.
3) 4/C QUICK-TRIP cable with connectors.
When QUICK-TRIP is on, the following settings are enabled:
•I QUICK-TRIP (I QT)
•GF QUICK-TRIP (GF QT)
These are standard AC-PRO-II settings. All other settings
remain in effect.
The “QUICK-TRIP ON LED” provides positive indication that
the QUICK-TRIP settings are active if the LED is on.
If the AC-PRO-II is not powered up (by current, voltage
(VDM), USB or 24VDC Aux.), the QUICK-TRIP Switch
“Push-to-Verify” button is available. Pressing this button will
“wake up” the trip unit using the AC-PRO-II battery, and the
QUICK-TRIP ON LED will illuminate, providing positive
indication that the QUICK-TRIP switch or remote
QUICK-TRIP switch is in the ON position.
7.0 QUICK-TRIP®System (optional)
7.1 QUICK-TRIP®Basics & Operation
**** NOTE ****
QUICK-TRIP Instantaneous and QUICK-TRIP Ground
Fault features can be activated only if the AC-PRO-II is
installed with (connected to) an AC-PRO-II
QUICK-TRIP switch.
**** IMPORTANT ****
A qualified engineer must determine the QUICK-TRIP
settings, calculate the incident energy levels and
determine the Hazard Risk Categories (HRC).

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Page 7
1 7/8" 1 7/8"
Figure G: AC-PRO-II QUICK-TRIP Switch Drilling Plan
The QUICK-TRIP system is easy to install on the front of the
breaker cubicle door.
To install the QUICK-TRIP Switch:
1. Find a suitable location on the cubicle door and mark
the location of the three (3) holes using the dimensions
in Figure 7.2.
2. Drill two (2) 1/4” mounting holes.
3. For the center hole, cut a 1-3/4” diameter hole using a
hole saw or alternately, use a 1-1/4” conduit knockout
punch (1.73” D).
4. Attach the QUICK-TRIP Switch to the front of the cubicle
door using the two (2) supplied 10-32 screws and lock
washers.
5. Connect the QUICK-TRIP Switch to the AC-PRO-II trip
unit by plugging one end of the 4/C cable provided into
the jack on the back of the QUICK-TRIP Switch. Plug
the other end of the cable into the “QT” jack on the front
of the AC-PRO-II.
6. Route the cable so it does not interfere with the opening
or closing of the cubical door or with the racking of the
breaker between connect and disconnect positions. Use
cable ties and holders to hold the cable in position.
Figure H: QUICK-TRIP Switch Mounting
Figure I: AC-PRO-II Quick-Trip Switch
The AC-PRO-II QUICK-TRIP switch includes terminals on the
rear for connection to a remote QUICK-TRIP switch (provided
by others).
Refer to Figure F. If 120VAC (+/- 15%) is applied to the
remote QUICK-TRIP switch terminals, the QUICK-TRIP
settings are activated.
The AC-PRO-II QUICK-TRIP switch includes terminals on the
rear for connection to a customer-supplied remote QUICK-
TRIP indicating light or other device.
Refer to Figure F. If the QUICK-TRIP System is activated
(ON), the Remote QUICK-TRIP trip Indication contacts close.
The contacts are rated 120VAC, 0.5A.
7.2 AC-PRO-II QUICK-TRIP®Switch Mounting
7.3 Remote QUICK-TRIP®Switch
7.4 QUICK-TRIP®Remote Indication
**** NOTE ****
QUICK-TRIP protection can be activated (by applying
120VAC to the remote Quick Trip switch terminals)
even when the AC-PRO-II QUICK-TRIP toggle switch is
in the OFF position. Therefore, if a remote
QUICK-TRIP switch is installed, URC recommends
installing label(s) or nameplate(s) that indicate the
presence and location of the remote QUICK-TRIP
switch.
Drill 1 ¾” diameter hole
or alternately use 1 ¼”
conduit knockout punch
Outline of AC-PRO-II
QUICK-TRIP Switch
Drill (2) ¼” diameter holes
QUICK-TRIP Switch
Side View
(2) 10-32 X 1/2 Screw
& Lock Washer

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Page 8
If AC-PRO-II is installed on a breaker that is located behind a
cubicle door, a USB panel mount extension cable and legend
plate is provided in the retrofit kit. This provides a permanent
USB connection from the AC-PRO-II to a USB port that is
accessible at the cubicle door. The cable (5/C, 6 feet long)
features a right angle mini-USB connector for the
AC-PRO-II and a USB port with cover, and a threaded nut for
securing to the cubicle door.
Figure J: USB Extension cable
8.1 USB Extension Cable Installation
USB PORT
AC-PRO-II Trip Unit
Use for SAFE-T-TRIP
and for InfoPro
Data Access
Drill (2) 3/16" holes
through door or panel
Drill 1" hole or use
1-9/16"
25/32" 25/32"
Stainless steel
Yellow w/ black text
USB legend plate
3"
2"
through door or panel
(D hole in legend plate
ensures that USB port is
oriented properly)
3/4" conduit punch
Figure K: USB Extension Plate Drilling
USB PORT
AC-PRO-II Trip Unit
Use for SAFE-T-TRIP
and for InfoPro
Data Access
Figure L: USB Extension Plate & Cable
Installation
To install the USB Extension cable:
1. Find a suitable location on the cubicle door and mark the
three (3) holes using the dimensions in Figure K
2. Drill two (2) 3/16” mounting holes.
3. For the center hole, cut a 1” diameter hole using a hole
saw or alternately, use a 3/4” conduit knockout punch.
4. Attach the USB legend plate to the front of the cubicle door
using the supplied two (2) 8-32 screws, nuts, and lock
washers.
5. Connect the right-angle USB connector to the
AC-PRO-II. Route the cable so it does not interfere with
the opening or closing of the cubical door or with the
racking of the breaker between connect and disconnect
positions. Use the supplied cable ties and holders to hold
the cable in position.
6. Position the USB port through the 1” opening and through
the opening in the legend plate. Ensure one rubber
washer is on the interior of the door / panel, and the
threaded USB cover and rubber washer are on the
exterior.
7. Thread the plastic nut onto the USB port connector,
securing it to the door / panel.
8.0 USB Extension cable
USB Extension Cable
Breaker Cubicle Door
USB Legend Plate
USB Water Tight
Cover
(2) 8-32 Screws, lock
washers & nuts

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Page 9
During normal operation, the trip unit display screen will be off
and in its power saving mode. When the “DISPLAY” button is
pressed during normal operation (no trips, errors, alarms, etc),
the trip unit will display current and voltage readings (if
equipped with Voltage Divider Module (VDM)). The neutral
and GF currents will only be displayed if neutral or GF
protective functions are turned on. See below. The “XXXX”
digits will display actual readings.
Figure M: Main (“Readings”) Screen
•The left column displays Currents in Amps for
Phases A, B, C, Neutral and Ground Fault.
•The right column displays Voltages and Frequency.
Breaker Current Less than 10% of CT Rating:
When the currents are less than about 10% of the CT rating,
the display will display “LOW” for currents.
Breaker Current Greater than 10% of CT Rating:
If the breaker current is greater than about 10% of the CT
rating, the current readings will be displayed.
Line-to-Line Voltages (if equipped with VDM):
“LOW” will be displayed if the Line-to-Line voltage is 90V or
below.
“N/A” will be displayed if the Voltage cannot be determined,
most likely because system voltage (i.e. 480V) is not present
at the VDM.
Note: If voltages and voltage labels (“Vab, Vbc, Vca”) do not
display, the AC-PRO-II is either not equipped with a VDM, or
the VDM is not properly connected to the AC-PRO-II, contact
URC.
InfoPro-AC is a software application that can be used with AC-
PRO-II for the following:
•Settings –upload, download, view, save, and print.
•Trip history including waveforms –view, save, and print.
•Waveforms (on-demand) –view, save, and print.
•Current, voltage, & power readings –view.
•Alarms and trip unit status Information
•Trip unit info: serial number, firmware versions, breaker
name.
•Firmware updates
Operating System:
Microsoft Windows, ideally Windows 10, 8, 7, or Vista.
Connection:
mini-USB (cable not included)
NOTE: if AC-PRO-II is located behind a cubicle door, a
USB panel mount extension was provided with the
retrofit kit.
The InfoPro-AC™ software application is available for
download at:
http://www.utilityrelay.com/Side_Bar/Downloads.html
11.0 Firmware Versions and Updates
To determine which firmware version is currently installed on
your AC-PRO-II, use the MORE menu. See Figure E.
The InfoPro-AC application can be used to update
AC-PRO-II firmware in the field using the USB port.
AC-PRO-II Firmware update instructions can be found in the
InfoPro-AC Help Menu. For firmware version information
see the following link:
http://www.utilityrelay.com/Side_Bar/Firmware_versions.html
Utility Relay Company
10100 Queens Way
Chagrin Falls, OH 44023
www.utilityrelay.com
Phone [phone]
Fax: [phone]
For full version of AC-PRO-II Instruction Manual, visit:
http://www.utilityrelay.com/Side_Bar/Instruction_Manuals.html
9.0 Normal Operations & Readings
10.0 InfoPro-ACTM Software Application

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
Page 10
Appendix A –Time Current Curves (TCC)
Long Time (LT) Pick-Up
150% ST Pick-Up
OFF & 100A steps
Short Time (ST) Pick-Up
ST I
I Pick-Up
OFF & 100A steps
Instantaneous (I) Pick-Up
150% to 1200% of LT Pick-Up
150% to 1200% of LT Pick-Up
20% to 100% of CT Rating
5A steps
Current in Multiples of Long Time Pick-Up
20X
2X
.01
150%
1X
I Pick-Up
6X
4X
1200%
10X .01
.40sec
.15sec
.20sec
.30sec
2
.10s I
ST I
T OFF
2
.1
.5
.07sec
T ON
.07s I T ON
T ON2
.10sec
2.0s
SECONDS
1
10
.40s I
.20s I
T ON
.15s I
T ON T ON
2
2
.30s I
T ON2
2
.1
.5
SECONDS
& without I
ST Delay with
2T
1
1200% ST Pick-Up
10
Overload Time Current Curve
AC-PRO-II Trip Unit
600% LT Pick-Up
@ 600% LT Pick-Up
20X
LT Delay
100
2.0 to 30.0 sec.
0.5 sec. steps
30s
2X
1000 1X 6X
4X 10X
100
1000
AC-PRO-II O.L. Rev 1.02 08/15/2017
(0.5A steps for CTs < 225A)
(10A steps for CTs < 225A)
(10A steps for CTs < 225A)
@ 1200% of
(I-OVRD)
CT Rating
(if applicable)
Instantaneous
Override
2
CT Secondary Rating 0.5A and above
50% to 100% of CT Rating
CT Secondary Rating below 0.5A
888.289.2864 www.utilityrelay.com
Short Time Band limits for I²T OFF
& I²T ON currents above 10xLT pickup:
0.40 band: 0.400 - 0.500 sec
0.30 band: 0.300 - 0.400 sec
0.20 band: 0.200 - 0.300 sec
0.15 band: 0.083 - 0.250 sec
0.10 band: 0.133 - 0.166 sec
0.07 band: 0.053 - 0.120 sec
Appendix A.1: Overload TCC

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
Page 11
Appendix A.2: Ground Fault (GF) TCC
.50s
Current in Percent of CT Rating
100%
20%
.01 40% 60%
GF I T OFF
2
T ON
T ON
GF I 2
.10s I2
.30s
.20s
.40s
200%
.20sec
.10sec
without I
.30sec
.40sec
.50sec
with &
GF Delay
.40s
.20s
.30s
2
Pick-Up
T
SECONDS
200% GF
Ground Fault (GF) Pick-Up
Ground Fault Time Current Curve
CT Rating (1200A Max)
20% to 200% of
OFF & 10A steps
100%
20% GF
Pick-Up
20% 40% 60% 200%
(100A steps for CTs > 5000A)
(1A steps for CTs < 225A)
OLD AC-PRO
GF TCC
.1
.5
SECONDS
1
10
100
1000
Current in Percent of CT Rating
100%
20%
.01 40% 60%
GF I T OFF 0.10 sec
2
GF I
T ON
T Slope
2
.10s I
.10sec
2
200%
Ground Fault (GF) Pick-Up
20% GF
Ground Fault Time Current Curve
OFF & 10A steps
20% to 200% of CT Rating
100%
20% 40%
Pick-Up
1
200%
1000
(1A steps for CTs < 225A)
60%
SECONDS
.20sec
I
.30sec
with or
.1
GF Delay
.5
.40s
10
.20s
100
.30s
.50s
.40sec .50sec
T
2
Pick-Up
200% GF
.50sec
NEW
AC-PRO-II
GF TCC
GF ends
CT Secondary Rating 0.5A and above
1200A Max
50% to 200% of CT Rating
CT Secondary Rating below 0.5A
1200A only
CT ratios over 24000
(requires VDM or 24VDC)
at 12xCT
does not comply with
0.5 sec GF delay setting
IEEE C37.17.
Note:
.10sec
.20sec
.30sec
.40sec
.50sec
AC-PRO-II G.F. Rev 2.01 08/15/2017
Current in Multiples of Ground Fault Pick-Up
2X
.01 1X 6X
4X 10X
.1
.5
SECONDS
1
10
100
2X
1000 1X 6X
4X 10X
AC-PRO-II G.F. Rev 2.0 12/21/2016
Current in Multiples of Ground Fault Pick-Up
2X
.01 1X 6X
4X 10X
.1
.5
SECONDS
1
10
100
2X
1000 1X 6X
4X 10X
AND
I T Ground Fault Slope
2
Ground Fault Slope OFF I T Ground Fault Slope
5
at 12xCT
GF ends
T Slope
GF I 5
slope OFF
does not comply with
0.5 sec GF delay setting
IEEE C37.17.
Note:
(available for breakers
with 1-Amp CTs).
Ground Fault Band limits:
0.50 band: 0.486 - 0.603 sec
0.40 band: 0.380 - 0.501 sec
0.30 band: 0.284 - 0.398 sec
0.20 band: 0.183 - 0.267 sec
0.10 band: 0.083 - 0.150 sec

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
Page 12
200%
100% 500% 1000%
.1
.5
2.0s
SECONDS
1
10
600% NOL
@ 600% NOL Pick-Up
NOL Delay
100
2.0 to 30.0 sec.
0.5 sec. steps
30s
1000
Current in Percent of NOL Pick-Up
100% 200% 500% 1000%
AC-PRO II
Pick-Up
Neutral Overload (NOL) Pick-up
5A steps for CTs > 225A
0.5A steps for CTs < 225A
Neutral CT Secondary Rating 0.5A and above
20% to 200% of CT Rating
Neutral CTs Secondary Rating below 0.5A
50% to 200% of CT Rating
AC-PRO-II NOL Rev 1.2 07/14/2015
NOL ends
at 1200% of CT
Rating.
Appendix A.3: Neutral Overload (NOL) TCC

AC-PRO-II®Quick Start Manual Rev 2.0 www.utilityrelay.com
Page 13
Pick-Up
20% 40% 60% 100% 200%
20% 40% 60% 100% 200%
OFF & 10A steps
20% to 200% of CT Rating
200% QT GF
SECONDS
.01
.1
1
10
100
1000
Quick-Trip Ground Fault Time Current Curve
(QT GF Pick-Up)
Current in Percent of CT Rating
20% QT GF
AC-PRO-II Trip Unit
Pick-Up
888-289-2864 www.utilityrelay.com
Utility Relay Company
Chagrin Falls, Ohio 44023
Quick-Trip Ground Fault Pick-Up
QT I Pick-Up
(QT I) Pick-Up
LT Pick-Up
100A steps
Current in Multiples of Long Time Pick-Up
20X
2X
.01
150%
1X
QT I Pick-Up
6X
4X
1200%
10X
.1
.5
1
5
Quick-Trip Instantaneous Time Current Curve
Quick-Trip Instantaneous
150% to 1200% of
SECONDS
(1A steps for CTs < 225A)
(10A steps for CTs < 225A)
4X1X 2X 10X
6X 20X
R
R
RR
AC-PRO-II Q.T. Rev 1.02 01/15/2015
CT Secondary Rating 0.5A and above
1200A max
50% to 200% of CT Rating
CT Secondary Rating below 0.5A
CT ratios above 24000
1200A only
(requires VDM or 24VDC)
QT-GF ends at
12 x CT Rating
Appendix A.4: QUICK-TRIP Ground Fault and QUICK-TRIP Instantaneous TCCs

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