Littelfuse AF0100 User manual

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Document Number: PM-1430-EN
AF0100
ARC-FLASH RELAY
Instruction Manual
REVISION 0-B-013118

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AF0100 Arc-Flash Relay
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AF0100 Arc-Flash Relay
TABLE OF CONTENTS
1 KEY FEATURES ......................................................1
1.1 Easy Installation ......................................1
1.2 Fail-Safe Operation..................................1
1.3 Fast Error and Fault Location...................1
1.4 USB Interface...........................................1
2 ARC-FLASH PROTECTION SYSTEM DESIGN ......3
3 SENSOR PLACEMENT ...........................................5
3.1 General Guidelines ..................................5
3.2 Switchgear Protection .............................5
3.3 Transformer Protection ............................5
3.4 Generator Protection ...............................5
4 OPTICAL SENSORS ...............................................6
4.1 PGA-LS10 Photoelectric Point Sensor
with Sensor Check...................................7
4.1.1 PGA-LS10 Connection .............................8
4.1.2 PGA-LS10 Installation .............................9
4.2 PGA-LS20 and PGA-LS30
Fiber-Optic Sensors with
Sensor Check.........................................10
4.2.1 Fiber Connection....................................10
4.2.2 Receiver Wiring Connections................10
4.2.3 Transmitter Wiring Connections ...........10
4.2.4 PGA-LS20 and PGA-LS30 Connection .... 11
4.2.5 Fiber-Optic Sensor Adjustment .............12
4.2.6 Sensor Adjustment For a Fiber Length
Other Than 60 cm (24 in).......................12
5 APPLICATION EXAMPLES ...................................13
5.1 Basic Scenario: One Sensor –
One Circuit Breaker...............................13
5.2 Total Clearing Time ...............................14
5.2.1 Arc-Detection Delay..............................14
5.2.2 Circuit Breaker Operating Time.............14
5.2.3 Total Clearing Time Examples...............14
6 INSTALLATION AND TERMINALS .....................15
6.1 Power Supply.......................................16
6.1.1 Line AC Supply (optional)....................16
6.1.2 Station Battery DC Supply (optional) ..16
6.1.3 Auxiliary DC Supply.............................16
6.1.4 Supply Surveillance.............................16
6.2 Inputs and Outputs..............................17
6.2.1 ERROR Signal Relay ............................17
6.3 Sensors................................................17
6.3.1 Light Immunity Adjustment.................17
6.3.2 Extending or Shortening Cable Length .... 17
7 USER INTERFACE ................................................18
7.1 Reset Button .......................................18
7.2 LED Indication and
Relay Operation ..................................18
7.3 USB Conguration Software...............20
7.3.1 USB Conguration Software –
Screen Examples.................................21
7.4 Firmware Upgrade ..............................24
8 COMMISSIONING ...............................................25
8.1 Conguration of Installed Sensors.....25
8.2 Testing the Sensors ............................25
8.3 Testing the TRIP 1 and TRIP 2 Outputs
and Associated Circuit Breakers ........26
8.4 Full Operation Test..............................26
9 SUPPORT RESOURCES .......................................27
9.1 Sending Information for Support................27
10 SPECIFICATIONS .................................................28
10.1 AF0100 ...............................................28
10.2 EMC Tests ..........................................29
10.3 Environmental Tests...........................29
10.4 Safety .................................................30
10.5 Certication........................................30
10.6 Sensors...............................................31
10.7 Ordering Information..........................32
10.8 Related Products................................32
10.9 Warranty ............................................32

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APPENDIX A: INSTALLATION LOG SHEET .............34
APPENDIX B: REDUNDANT TRIP
CIRCUIT DESCRIPTION .............................................35
APPENDIX C: AF0100 REVISION HISTORY .............36
LIST OF FIGURES
1 AF0100 Top View (ordering option
AF0100-00 shown).......................................2
2 AF0100 with Sensor and USB View
(ordering option AF0100-00 shown)............2
3 AF0100 Typical Wiring Diagram..................4
4 PGA-LS10 Detection Range for a
3 kA Fault......................................................... 7
5 PGA-LS10 Connection Diagram...................8
6 PGA-LS10 Mounting Detail .........................9
7 PGA-LS20 and PGA-LS30
Connection Diagram..................................11
8 Basic AF0100 Conguration ......................13
9 AF0100 Outline And
Mounting Details.......................................15
10 TRIP and ERROR Relays
Maximum Switching Capacity....................33
LIST OF TABLES
1 Circuit Breaker Operating Time.................14
2 AF0100 Firmware Upgrade Sequence ......24
3 Sample Table for Testing a System ............26

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AF0100 Arc-Flash Relay
1 KEY FEATURES
The AF0100 Arc-Flash Relay is a high-speed, arc-detection
device for electrical power-distribution systems. The AF0100
has two Form-C Trip relays, and has inputs for up to two
optical sensors for optimal arc detection. The inputs support
both point sensors and fiber-optic line sensors, which cover
a larger area.
Using optical sensors rather than relying strictly on current
measurement allows a much faster detection time than
overcurrent relays or a circuit breaker alone can typically
provide, as the light from the arc is unique to arc faults,
whereas current pulses above the nominal level are part of
normal operation for many systems.
On the occurrence of an arc fault, the AF0100 detects the
fault and activates the trip relays, which trips the circuit
breaker(s) supplying the fault. In a typical system, a trip occurs
within 5ms. The total arcing time is effectively reduced to
the mechanical opening time of the circuit breaker, typically
between 30 and 75 milliseconds. This reduces the energy of
the arc fault significantly, increasing worker safety, reducing
fault damage, and improving uptime.
The AF0100 can be used on ac or dc electrical systems and
can be powered from either an ac or dc supply, or both. For
all available ordering options, see section 10.7.
1.1 Easy Installation
The AF0100 includes two sensor inputs, two trip relays,
one error relay, and a digital input and output interface
which makes it possible to connect additional AF0100 or
AF0500 units. See Fig. 1. The complete configuration and
“programming” of the system can be done by simply wiring
the inputs and outputs marked with green arrows – no
external software is needed.
A system with multiple zones and upstream circuit breakers
can be implemented such that in many applications, the
switchboard wiring diagram can completely describe how
the arc-flash system works.
The relay will automatically learn which sensors and
power supplies are connected, and will indicate an alarm
if a previously connected wire breaks or is unplugged. If a
configuration change is needed, the redetection process
can be triggered by pressing the Reset button for 20 s, see
section 7.1.
1.2 Fail-Safe Operation
The AF0100 continuously monitors its internal circuitry as
well as the connected optical sensors. Any system faults,
including a sensor-cable fault, are indicated by an Error relay
and the Error LED on the front panel.
A redundant trip circuit ensures that the AF0100 will trip
the circuit breaker on an arc flash even if a primary trip-
circuit component fails (shunt trip mode only). The design
of the redundant trip circuit also provides a significantly
faster response to an arc on power-up (for example, after
maintenance during a shutdown) than is possible with
microprocessor-only relays, which is an advantage in smaller
self-powered systems.
1.3 Fast Error and Fault Location
The optical sensors used with the AF0100 have built-in LED’s
for indication of health and for easy location of arc faults.
The AF0100 also has one LED per optical sensor on the front
panel to indicate which sensor(s) have caused a trip and for
indicating problems in the installation.
1.4 USB Interface
A USB interface on the lower panel of the AF0100 provides
easy PC access to configuration settings. No PC driver or
software installation is required.

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AF0100 Arc-Flash Relay
FIGURE 1. AF0100 Top View (ordering option AF0100-00 shown).
FIGURE 2. AF0100 with Sensor and USB View (ordering option AF0100-00 shown).

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AF0100 Arc-Flash Relay
2 ARC-FLASH PROTECTION SYSTEM DESIGN
In order to find the necessary components and configuration
for protecting a system, a single line diagram and knowledge
of the physical configuration of the system is needed.
1. Start by identifying the number and type of sensors
that are needed to have coverage of the complete
system. In order to have complete coverage, all
bus bar sections, circuit breaker connection points,
and bolted connections must have a sensor nearby.
Typically, a single point sensor per enclosed
switchgear compartment is sufficient, but if a large
internal component is blocking the line-of-sight, an
additional sensor may be necessary. A fiber sensor
can be threaded along a bus bar to protect many
compartments, but only if they are interrupted by
the same circuit breaker. The fiber sensor can also
be used to improve coverage of compartments with
many bulky components.
2. Identify which circuit breakers to open in order to
completely interrupt all current to each sensor. If
more sensors are isolated by the same set of circuit
breakers, these are said to be in the same zone – an
arc-flash event on any of these sensors will open the
same set of circuit breakers.
3. Identify if the system needs coordinated tripping – if
upstream circuit breakers, which trips the incoming
feeder for several downstream circuit breakers, are
present in the system, a decision must be made to
either merge all the smaller zones and trip all circuit
breakers at once (fast and inexpensive, but may trip
more outgoing feeders than necessary), or to only
trip the upstream circuit breaker if the downstream
circuit breaker fails to interrupt the current (slower
and costlier, but trips only what is necessary).
4. Based on the number of sensors and zones, the
necessary number of outputs and sensors can be
found. Each AF0100 provides one zone (one or two
circuit breaker outputs) and two sensor inputs, which
can be bundled into larger zones by a single wire, and
which can combine fiber and point sensors completely
as needed.
5. Now, place one AF0100 trip output for each circuit
breaker in the system. If there are more than two
sensors per zone, connect additional AF0100 or
AF0500 zones together by connecting the “TRIP” and
“TRIPPED” terminals in all zones. Zones can also be
made larger by using a sensor covering a larger area,
i.e. by changing point sensors to fiber sensors. Place
the sensors in the cabinets, and connect them to the
zone inputs. The sensor cables, which use copper
wire, can be shortened or extended as needed.

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AF0100 Arc-Flash Relay
Sensor 1 Sensor 2 USB
Note 3
N
L1 L1
N N
Protection
Active
GTri p R
L1
A B C
x x x
L1
N
PGA-LS10
Point Sensor PGA-LS20/PGA-LS30
Fiber Optic Sensor
Reset
Tri p
Coil
Sensor 1 Sensor 2 USB
Note 3
N
L1 L1
N N
Protection
Active
GTri p R
L1
A B C
x x x
L1
N
PGA-LS10
Point Sensor PGA-LS20/PGA-LS30
Fiber Optic Sensor
Reset
Tri p
Coil
NOTES:
1. RELAY OUTPUTS SHOWN DE-ENERGIZED.
2. ATOTAL OF TWO POINT OR FIBER-OPTIC SENSORS
CAN BE CONNECTED.
3. USB ‘B’ CONNECTOR. FOR CONFIGURATION, SEE
SECTION 7.3.
FIGURE 3. AF0100 Typical Wiring Diagram.

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AF0100 Arc-Flash Relay
3 SENSOR PLACEMENT
3.1 General Guidelines
Optical sensors should have line-of-sight to points being
monitored. Ensure that the point sensors and fiber are not
blocked by fixed or moveable objects. Areas that will be
accessed for maintenance or with moveable parts (such
as draw-out circuit breakers) should be considered a high
priority for installation. Do not place sensors or cables on
bare components that will be energized and avoid sharp
bends in the cable, particularly when using the PGA-LS20
and PGA-LS30 fiber-optic sensors. The electrical cables and
sensors should be considered to be at ground potential when
determining electrical clearances.
Sensors should be mounted in a location that will minimize
the chance of debris or dust build-up and with easy access
for maintenance if needed. A point sensor mounted at the
top of an enclosure and facing down is optimal for reducing
dust build-up. It should be noted that most enclosures are
metallic and the reflectivity combined with the high intensity
of an arc mean that even a moderately dusty sensor will
collect adequate light.
In dusty environments, sensor cleaning should be part of a
regular maintenance schedule and can be performed using
compressed air or a dry cloth.
3.2 Switchgear Protection
The sensors used for arc-flash detection are optical sensors.
Line-of-sight between the points where an arc could occur
and the sensor is optimal, but the reflectivity of metallic
compartments will help in distributing the light from an arc
fault in the entire cabinet.
Often one point sensor is sufficient to monitor a complete
switchgear compartment. However, if there are large
components such as circuit breakers that cast shadows over
wider areas, more than one point sensor is required.
3.3 Transformer Protection
TheAF0100canalsobeused fortheprotectionoftransformers.
Two or more point sensors should be used per transformer to
monitor the primary and secondary connection terminals. For
the placement of the sensors, the same considerations apply
as for switchgear protection.
3.4 Generator Protection
The main area of concern for protecting the generator is the
conductors between the generator and the generator breaker.
A fault in this area is not protected by the generator breaker
from overcurrent or arc flash. Often, one or two sensors are
enough to monitor the breaker and bus connection back to
the generator. If other electrical equipment is installed on
the generator, it should also be considered in an arc-flash
risk assessment. When protecting the generator to a breaker
connection, it is important to disconnect all sources of energy
for the arc flash. Open the generator breaker to disconnect
from the utility or other parallel generators, and connect
to the automatic voltage regulator (AVR), emergency stop
or other control circuit to turn off the generator. The two
trip relays on the AF0100 are isolated so that the breaker
and control circuit can both be tripped using independent
voltages if necessary.

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AF0100 Arc-Flash Relay
4 OPTICAL SENSORS
The AF0100 has two inputs for optical arc-fault sensors.
Two sensor types are supported:
• PGA-LS10 Photoelectric Point Sensors with sensor check
• PGA-LS20 and PGA-LS30 Fiber-Optic Sensors with
sensor check
The sensors can be used together, in any combination.
Both sensor types have LED indication of sensor health and
fault location. A sensor-check circuit tests the sensor to verify
that the sensor assembly is functioning correctly. A healthy
sensor will flash its internal red LED every few seconds. A
sensor that has detected an arc will indicate solid red until
the trip is reset.
The sensors connect to the AF0100 with shielded three-wire
20 AWG (0.5 mm2) electrical cable. Each sensor includes 10 m
(33 ft) of cable which can be shortened or extended up to 50 m
(164 ft). These cables should be considered to be at ground
potential when determining electrical clearances in the
cabinet.
Any connected optical sensor with circuit check will be
automatically detected and cause the AF0100 to report an
error if it is subsequently disconnected.
PGA-LS10
PGA-LS20 / PGA-LS30
NOTE: Inserting and removing a sensor cable can
cause a trip, depending on which terminals make
contact first. To guard against nuisance tripping,
remove the trip coil terminal blocks before
connecting and disconnecting sensors, or perform
the maintenance while the system is de-energized.

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AF0100 Arc-Flash Relay
4.1 PGA-LS10 Photoelectric Point Sensor with
Sensor Check
This sensor has a detection area of a 2-m (7-ft) half-sphere
for arcs of 3 kA or more.
A built-in LED enables the AF0100 to verify the function of
the light sensor, wiring, and electronics. If the sensor does
not detect the sensor-check LED, a sensor-fail alarm will
occur – the ERROR relay will change state and the sensor
indication LED will begin to flash. See Section 7.
The sensor includes 10 m (33 ft) of shielded three-wire
electrical cable which can easily be shortened or extended to
a maximum of 50 m (164 ft). For more information on sensor
cabling, see Section 6.3.2.
FIGURE 4. PGA-LS10 Detection Range for a 3 kA Fault.

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AF0100 Arc-Flash Relay
4.1.1 PGA-LS10 Connection
FIGURE 5. PGA-LS10 Connection Diagram.
5V TX RX 0V
SENSOR 1 SENSOR 2
5V TX RX 0V
8.3
(0.33)
10 m
(32.8 ft)
NOTES
1. DIMENSIONS IN MILLIMETERS (INCHES) UNLESS OTHERWISE STATED.
2. UPTO 2 PGA-LS10 PHOTOELECTRIC POINT SENSORS WITH BUILT-IN
CIRCUIT CHECK CAN BE CONNECTED.
3. THE PGA-LS10 SENSOR SHIPS ASSEMBLED WITH A PLUG-IN CONNECTOR.
IT MAY BE NECESSARYTO DISCONNECTTHE PLUG-IN CONNECTOR
DURING INSTALLATION.
TERMINAL FUNCTION COLOR
5V
TX
RX
0V
SUPPLY
CIRCUIT CHECKTRANSMIT
RECEIVE
SHIELD
RED
WHITE
YELLOW
BLACK/COPPER
NOTE 2
9.6
(0.38)
14.2
(0.56)
23.8
(0.94)
44.0
(1.73)
24.0
(0.94)
4.0
(0.16)
RED
WHITE
YELLOW
SHIELD / BLACK
RED
WHITE
YELLOW
SHIELD / BLACK
2.4
(0.09)
52.0
(2.05)
32.0
(1.26)
Ø4.25(0.167)
MOUNTING HOLES
Ø8.3(0.33)
SENSOR LENS
RED LED FOR
CIRCUIT CHECK AND
VISUAL DIAGNOSTICS

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AF0100 Arc-Flash Relay
FIGURE 6. PGA-LS10 Mounting Detail.
4.1.2 PGA-LS10 Installation
The PGA-LS10 point sensor includes an adhesive-backed drill template for easy surface or panel-mount installation.

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AF0100 Arc-Flash Relay
4.2 PGA-LS20 and PGA-LS30 Fiber-Optic Sensors
with Sensor Check
The PGA-LS20 and PGA-LS30 sensors have a 360° detection
zone along the fiber’s length. A built-in LED enables the
AF0100 to verify the function of the light sensor, wiring, and
electronics. If the sensor does not detect the sensor-check
LED, a sensor-fail alarm will occur. The ERROR output will
change state, and both the LED on the front panel and the
indicator LED in the sensor itself will begin to flash red. See
Section 7.
The PGA-LS20 and PGA-LS30 sensors have three components:
1. A fiber-optic cable, with one end covered with a black
sleeve.
• PGA-LS20 has 8 m (26 ft) of active fiber and 2 m (7
ft) of covered fiber.
• PGA-LS30 has 18 m (59 ft) of active fiber and 2 m
(7 ft) of covered fiber.
2. A transmitter with a white enclosure and a white
thumb nut.
3. A receiver with a white enclosure, a black thumb nut,
and an adjustment screw behind an access hole.
Both the receiver and the transmitter connect to one AF0100
input using shielded three-wire electrical cable. All three
components are monitored to ensure correct operation.
4.2.1 Fiber Connection
The fiber is the light-collecting element of the PGA-LS20
and PGA-LS30. It must be installed so it has line-of-sight
to all current-carrying parts. In some cases this may be
accomplished by following the bus bars along the back wall
of the cabinets.
Drill holes using the included drill template and fasten the
transmitter and receiver to the cabinet walls using rivets or
screws. Connect the attached cables to the AF0100. The
wires of the transmitter and receiver must be connected as
shown in Fig. 7.
Connect the black-sleeve-covered end to the receiver using
the black thumb nut, and the white uncovered end to the
transmitter using the white thumb nut. Ensure the fiber is
inserted completely into the transmitter and receiver and the
nuts are tightened. Pull gently on the cable to verify a secure
connection. The maximum pull strength of the fiber is 30 N
(6.7 lbf).
The fiber should not be sharply bent or pinched. The minimum
bending radius is 5 cm (2 in). Ensure that any drilled holes
are free of any sharp edges or burrs. Use grommets for
further protection.
4.2.2 Receiver Wiring Connections
Connect the red wire to 5V.
Connect the yellow wire to RX.
Connect the white wire and the shield to 0V.
4.2.3 Transmitter Wiring Connections
Connect the red wire to 5V.
Connect the white wire to TX.
Connect the shield to 0V.
The yellow wire is not used.
NOTE: Removing the fiber from the transmitter
can cause a trip if the fiber end is pointed towards
a light source, since the fiber conducts light. This
can also happen if the receiver is pointing directly
towards a light source without a fiber connected.
To guard against nuisance tripping, remove the
trip coil terminal blocks before connecting and
disconnecting sensors and fibers, or perform the
maintenance while the system is de-energized.

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AF0100 Arc-Flash Relay
4.2.4 PGA-LS20 and PGA-LS30 Connection
The sensor is shipped with the wires mounted in a terminal
block. See Fig 7.
The transmitter and receiver include 10 m (33 ft) of shielded
three-wire electrical cable which can be shortened or
extended up to 50 m (164 ft). Transmitter and receiver cables
can be different lengths and must be independently shielded.
Failure to independently shield transmitter and receiver
cables can lead to an incorrect circuit check – a faulty sensor
could be falsely detected as continuous. However, if there is
no sensor fault, arc-flash detection will function normally in
this condition. For more information on sensor cabling, see
Section 6.3.2.
FIGURE 7. PGA-LS20 and PGA-LS30 Connection Diagram.
FIBER
(PGA-LS20: 8 m, 26.2 ft)
(PGA-LS30: 18 m, 59 ft)
NOTES
1. DIMENSIONS IN MILLIMETERS (INCHES) UNLESS OTHERWISE
STATED.
2. UPTO 2 PGA-LS20 / PGA-LS30 FIBER-OPTIC SENSORS
WITH BUILT-IN CIRCUIT CHECK CAN BE CONNECTED.
3. THE PGA-LS20 AND PGA-LS30 SENSORS SHIP
ASSEMBLED WITH A PLUG-IN CONNECTOR. IT MAY BE NECESSARY
TO DISCONNECT THE PLUG-IN CONNECTOR DURING INSTALLATION.
BLACK SLEEVE
(PGA-LS20: 2 m, 6.5 ft)
(PGA-LS30: 2 m, 6.5 ft)
TERMINAL FUNCTION COLOR
5V
TX
RX
0V
SUPPLY (TRANSMITTER AND
RECEIVER)
SENSOR CHECK (TRANSMITTER)
SIGNAL (RECEIVER)
SENSOR CHECK (RECEIVER) AND
BOTH SHIELDS
RED
WHITE
YELLOW
BLACK/COPPER
Ø4.25(0.167)
MOUNTING HOLES
RECEIVER
SENSITIVITY
ADJUSTMENT
SCREW
DECREASE
SENSITIVITY
THUMB NUT
2.0
(0.08)
46.0
(1.81)
18.8
(0.74)
24.0
(0.94)
4.0
(0.16)
4.0
(0.16)
42.0
(1.65)
46.0
(1.81)
32.0
(1.26)
RED
WHITE
YELLOW
SHIELD / BLACK
RED
WHITE
SHIELD / BLACK
5V TX RX 0V
SENSOR 1 SENSOR 2
5V TX RX 0V

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AF0100 Arc-Flash Relay
4.2.5 Fiber-Optic Sensor Adjustment
The sensor is calibrated at the factory for 60 cm (24 in) of fiber
in each monitored compartment. When using a fiber-optic
sensor in compartments with less than 60 cm (24 in) of fiber,
the sensitivity may have to be adjusted. The sensor is unable
to differentiate between 10,000 lux on 60 cm (24 in) of fiber
and 30,000 lux on 20 cm (8 in) of fiber – the same amount
of light is transmitted through the fiber to the receiver. To
achieve the desired sensitivity, the receiver (with the black
thumb nut) must be adjusted.
4.2.6 Sensor Adjustment For a Fiber Length Other
Than 60 cm (24 in)
To adjust the fiber length, a powerful light source of at least
100 lumen (e.g. 500 W halogen lamp) and a spare point
sensor is required. Use the following procedure to calibrate
the sensor:
1. Remove the trip coil connector to avoid tripping the
circuit breaker while testing.
2. Use a point sensor to find the distance to the lamp
at which the sensor just trips. Note the distance
between the lamp and the point sensor (typically
15-40 cm (5.9-15.7 in), depending on the lamp).
3. Adjust the receiver (black thumb nut) sensitivity
level to the minimum by turning the small metal
screw clockwise until it begins to click. This may be
too low to detect the sensor-check signal and may
cause the related LED on the relay to flash red to
signal the error. This has no implication for the rest
of the procedure, since the trip signal is transmitted
anyway.
4. Place the lamp facing the fiber in the compartment
closest to the transmitter end (white thumb nut) of
the fiber. This allows for loss along the full length
of the fiber. The distance between the lamp and the
fiber should be the same as the distance observed
in step 2.
5. Slowly turn the metal screw on the receiver counter-
clockwise until the AF0100 sensor-indicator LED for
that sensor changes to red, indicating a trip.
6. Press reset on the relay, and check that the sensor
indicator LED turns green, indicating that the
sensor-check signal is detected, and that the fiber
is thus protected by circuit check.
If the system compartment is very small, it may not be
possible to adjust the fiber to provide sufficient sensitivity.
Contact Littelfuse for support.

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AF0100 Arc-Flash Relay
5 APPLICATION EXAMPLES
5.1 Basic scenario: One Sensor – One Circuit Breaker
No configuration necessary.
FIGURE 8. Basic AF0100 Configuration.
Trip 1
Sensor
+24 Incoming
Circuit
Breaker
Sensor
1 or 2
AF010 0

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AF0100 Arc-Flash Relay
5.2 Total Clearing Time
The AF0100 is capable of tripping a circuit breaker in less
than 5 ms (typical) from when light hits the sensor. This is not
the same as the clearing time for the fault. The arc fault will
continue until the current to the fault has stopped flowing,
which happens when the circuit breaker connected to the
unit has reacted.
5.2.1 Arc-Detection Delay
The AF0100’s default arc-flash detection intentional delay
time is 1 ms, but can be configured between 0 and 10 ms via
the USB configuration software.
The total operating time will be the intentional delay plus the
relay operating time based on wiring and configuration. The
AF0100 operating times with no intentional delay are shown
below.
5.2.2 Circuit Breaker Operating Time
Circuit breakers have a predetermined operating time,
dependent on the type of circuit breaker. Older circuit breakers
have clearing times up to eight cycles, while modern circuit
breakers are able to open in one to five cycles. Refer to the
specifications of the installed circuit breaker.
The total clearing time is:
Total Clearing Time = Arc-Detection Delay + Local Circuit
Breaker Operating Time
With the AF0100, the dominating time by far is the circuit
breaker operating time.
5.2.3 Total Clearing Time Examples
Example: Total Clearing Time with a 3-cycle circuit
breaker
A 3-cycle circuit breaker at 50 Hz tripping due to light on an
AF0100 sensor will have a total clearing time of:
5 + 60 = 65 ms
It is possible to reduce the total clearing time by installing
special devices, which shunt the current away from the arc
fault. These can be found with clearing times down to 1-2
ms, reducing the total clearing time down to less than 7 ms.
TABLE 1. CIRCUIT BREAKER OPERATING TIME.
CIRCUIT BREAKER OPERATING TIME 50 HZ 60 HZ
8 cycles 160 ms 133 ms
5 cycles 100 ms 83 ms
3 cycles 60 ms 50 ms
2 cycles 40 ms 33 ms
1½ cycles 30 ms 25 ms
1 cycle 20 ms 17 ms
OPERATING MODE CONTACT
CONFIGURATION TRIP TIME
Shunt
(Non-fail-safe)
N.O.
(Normally Open) < 5 ms
N.C.
(Normally Closed) < 3 ms
Undervoltage
(Fail-safe)
N.O.
(Normally Open) < 3 ms
N.C.
(Normally Closed) < 8 ms

Page 15
REV. 0-B-013118
AF0100 Arc-Flash Relay
6 INSTALLATION AND TERMINALS
The AF0100 can be surface mounted using two #6 screws
(19mm or longer), or it can be DIN-rail mounted.
Ensure there is enough clearance around the module to allow
the plug-in terminals to be removed and inserted.
Do not install modules which have been damaged in transport.
FIGURE 9. AF0100 Outline and Mounting Details.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.
127.6
5.03
2 MOUNTING HOLES
5.2
0.20
95.2
3.75
76.6 3.02
16.2
0.64
16.2
0.64
6.3
0.25
6.3
0.25
89.2 3.51
FRONT
BOTTOM
35.3 1.39
59.8
2.36
SIDE
TOP
16.2
0.64
16.2
0.64
95.2
3.75
89.2 3.51
127.6
5.03
76.6 3.02
6.3
0.25
6.3
0.25
MOUNTING DETAIL
NOTES:
DIMENSIONS IN MILLIMETERS [INCHES]. 1.
MOUNT USING DIN RAIL OR TWO #6 SCREWS 2.
0
PURCHASER
PROJECT IDENT.
PURCHASE ORDER NO.
EQUIPMENT NO.
REFERENCE DWG. NO.
DES D.
DWN.
PROJECT NO.
DWG. NO.
CKD.
SCALE
REV.
APD.
REVISION
NO. BY DATE
JR 0 INITIAL RELEASE
Confidential and Proprietary
The information and know-how shown in this drawing are the property of Littelfuse Startco
and may not be copied or reproduced without the written permission of Littelfuse Startco nor
may they be used in any manner directly
or indirectly detrimental to the interest of Littelfuse Startco.

Page 16
REV. 0-B-013118
AF0100 Arc-Flash Relay
6.1 Power Supply
The AF0100 Arc-Flash Relay can be supplied by either a high
voltage ac or dc supply, an auxiliary low voltage supply, or
both.
6.1.1 Line AC Supply (optional)
Connect an ac supply to terminals 17 and 18. The supply
voltage must be 100 to 240 Vac.
6.1.2 Station Battery DC Supply (optional)
Connect a dc supply to terminals 17 and 18. The supply
voltage must be 100 to 240 Vdc.
6.1.3 Auxiliary DC Supply
Connect a dc supply to terminals 14 and 15, ensuring correct
polarity. The supply voltage must be 24 to 48 Vdc.
6.1.4 Supply Surveillance
The AF0100 will automatically learn which supplies to
expect, and will indicate an error if one of the supplies is
missing or out of nominal range. This is useful to make sure
that a failure in a redundant supply is detected.
The error will auto-reset when the supply is re-established or
can be cleared by holding the RESET button for 20 seconds.
This will redetect any connected sensors and power supplies.
See Section 7.1 for more information on the RESET button.