Page 1
Supplementary
CirCuit proteCtorS
ul 1077 for equipment, lighting
and Control CirCuitS
UR Series
AU-3B30UR 3-pole
supplementary protector,
• DIN Rail Mounted
• 17.5 mm Width per Pole
• Thermal Magnetic,
Current Limiting
• 0.5-60A, 480 Y/277 Vac 50/60 Hz
• 10kA Short Circuit
Interrupting Capacity
• Box Clamp or Ring Tongue
Wire Connection
While UL 489 branch circuit breakers protect
feeder or branch circuits, UR Series UL 1077
supplementary protectors are made to trip
faster than a standard UL 489 circuit breaker,
therefore providing additional protection for
specific devices. Supplementary protectors
provide critical protection in applications
where branch circuit protection is not required,
or is already provided by a separate device.
These breakers are installed on the load side
of the branch circuit and are typically used to
safeguard control circuits, lighting, business
equipment, appliances and a range of
other applications.
UR Series supplementary protectors are
available in one‑, two‑, and three‑pole
configurations and up to 21 different current
ratings from 0.5A to 60A and can safely
be used in applications up to 480Y/277
Vac with a 10 kA short circuit withstand
rating (see table on next page for backup
fuse requirements). Three different trip
characteristics, including B, C and D curves,
give you the ability to configure the exact
protection scheme you require. These
supplementary protectors are DIN rail
mounted and at only 17.5 mm (0.69") wide,
they are extremely compact and help to
reduce panel size.
Accessories are field mounted on these
supplementary protectors for enhanced
control and monitoring capabilities. Field
mounting kits include all necessary parts
and instructions. Accessories can be
gang mounted on a single controller (the
auxiliary switch in the outside position). The
mounting arrangement links the internal
latch‑pins for the tripping mechanisms,
ensuring simultaneous trips. Handles are
linked to simplify manual resetting.
Accessories include neutral pole, shunt and
undervoltage trip and auxiliary contacts.
30 Amp B-trip curve.
For Terminal
Blocks and
Enclosures. Visit
omega.com/auto
Applications
B-Trip Protectors
Include business equipment, wiring
protection, lighting, appliances, control
circuits and some electronic applications.
Relatively long thermal trip delay but low
magnetic trip point.
C-Trip Protectors
Include lighting, wiring protection,
appliances, business equipment, and control
circuit applications. Relatively long thermal
trip delay and medium magnetic trip point.
D-Trip Protectors
Include control transformers, power supplies
and reactive loads. Relatively long thermal
trip delay and very high magnetic trip point.
DIN rail sold separately.
Visit omega.com/drtb-rail
AU-1B10UR 1-pole
supplementary protector,
10Amp B-trip curve.
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SPECIFICATIONS
3 Pole
35
(1.38)
74.7
(2.94)
93.3
(3.67)
52.5
(2.07)
2 Pole 3 Pole
35
(1.38)
74.7
(2.94)
35
(1.38)
93.3
(3.67)
52.5
(2.07)
68.4 (2.69)
6.5
44 (1.73)
45
(1.77)
Voltage Rating: 480Y/277 Vac
Short Circuit Withstand Rating
(UL - Ratings):
0.5-6A (RC): 10kA with no back‑up fuse
8-60A (RC): 10kA with UL‑listed Class J
back‑up fuse; 5kA with no back‑up fuse
Calibration Temperature: 30°C (86°F)
Operating Temperature: ‑25 to 55°C
(‑13 to 131°F)
Storage Temperature: ‑40 to 70°C
(‑40 to 158°F)
Dimensions: mm (inch)
1 Pole
89.3
(3.52)
2 Pole
SHORT CIRCUIT WITHSTAND RATINGS FOR SUPPLEMENTRY PROTECTORS
UL-Listed Class J FUSE NO BACKUP
TRIP CURVE Amp RANGE UP TO 10 kA FUSE REQUIRED
All 0.5 to 10 A 70 A 10kA
All 12 to 60 A 4x RC
Up to rated current.
*
Terminal Size Acceptability:
Top: 18‑3 AWG
Bottom: 18‑2 AWG
Tightening Torque: 25 lb‑in. (2.8 Nm)
Terminal Protection Degree: IP20
Vibration Resistance: >15 g (18 to 50 Hz)
Mechanical Life: 6000 on/off cycles
3 Pole
BACKUP PROTECTION
* 5kA
Electrical Life: 10,000 on/off cycles
Dimensions:
Height: 89.3 mm (3.52")
Width:
One Pole: 17.5 mm (0.69")
2 Pole: 35 mm (1.38")
3 Pole: 52.5 mm (2.07")
Depth: 74.9 mm (2.95")
45
(1.77)
17.5
(0.69)
35
(1.38)
52.5
(2.07)
(0.26)
Trip-Characteristics* Applications
Characteristic Trip Boundaries
Thermal Trip
Must not
Trip>100ms
Must Trip
<1hr
B-Characteristics
1.13xRC1.45xRC 3xRC 5xRC
Magnetic Trip
Must not
Trip>100ms
Must Trip
at 100ms
C-Characteristics
1.13xRC1.45xRC 5xRC 10xRC
Lighting
Wiring
Protection
Control
Circuits
Business
Equipment
Appliances
Control
Transformers
6.5
Power
Supplies
Side view
General
Electronics
44 (1.73)
68.4 (2.69)
Reactive
Load
D-Characteristics
1.13xRC1.45xRC 10xRC 20xRC
The value of each characteristic is shown vertically beneath its corresponding heading.
*
Warning!
This information should only be used as a selection guide. The use of a miniature circuit Breaker/supplementary protector in an application
with a certain Trip Characteristic always requires prototype testing! It is the responsibility of the circuit design engineer to select the appropriate
miniature circuit breaker/supplementary protector for his specific application.
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Page 3
B Trip Curve
1.13-1.45xI
N
123456 8 10 20 40 100
Multiple of Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
Seconds Minutes
Tripping time t
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
UR Series Trip Curves
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
123 4 5 6810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tripping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
0.5A Through 10A Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 6810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tr ipping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
0.5A Through 10A Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 6810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tripping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
1.13-1.45xI
N
123456 8 10 20 40 100
Multiple of Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
Seconds Minutes
Tripping time t
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
0.3A Through 10A Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 166810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tripping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
B Trip CurveC Trip CurveD Trip Curve
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 6810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tr ipping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
0.5A Through 10A Rated Current
1.13-1.45xI
N
123456 8 10 20 40 100
Multiple of Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
Seconds Minutes
Tripping time t
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
0.3A Through 10A Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 166810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tripping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
1.13-1.45xI
N
123456 8 10 20 40 100
Multiple of Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
Seconds Minutes
Tripping time t
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
0.3A Through 10A Rated Current
UR Series Trip Curves
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
12345 6810 20 40 100
Multiple of Rated Current
Seconds Minutes
Tr ipping time t
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1.13-1.45xI
N
1.13-1.45xI
N
123456 8 10 20 40 100
Multiple of Rated Current
10
-3
4x10
-3
10
-2
4x10
-2
10
-1
0.4
1
4
10
1
4
10
40
60
Seconds Minutes
Tripping time t
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
B Trip CurveC Trip CurveD Trip Curve
C Trip Curve D Trip Curve
1.13-1.45xI
60
40
10
N
4
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1
10
4
Tripping time t
1
0.4
-1
10
-2
4x10
-2
10
-3
4x10
Seconds Minutes
-3
10
1.13-1.45xI
60
40
10
123 4 5 6810 20 40 100
Multiple of Rated Current
N
4
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1
10
4
1
Tripping time t
0.4
-1
10
-2
4x10
-2
10
-3
4x10
Seconds Minutes
-3
10
123 4 5 6810 20 40 100
Multiple of Rated Current
1.13-1.45xI
N
60
40
10
4
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1
10
4
1
Tr ipping time t
0.4
-1
10
-2
4x10
-2
10
-3
4x10
Seconds Minutes
-3
10
12345 6810 20 40 100
1.13-1.45xI
60
40
10
4
1
10
4
1
Tripping time t
0.4
-1
10
-2
4x10
-2
10
-3
4x10
Seconds Minutes
-3
10
12345 6810 20 40 100
Multiple of Rated Current
N
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
Multiple of Rated Current
1.13-1.45xI
60
40
10
N
4
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
1
10
4
1
Tripping time t
4x10
4x10
Seconds Minutes
0.4
10
10
10
-1
-2
-2
-3
-3
123456 8 10 20 40 100
Multiple of Rated Current
1.13-1.45xI
60
40
N
10
4
1
10
4
1
Tripping time t
0.4
-1
10
4x10
10
4x10
Seconds Minutes
10
-2
-2
-3
-3
12345 166810 20 40 100
Multiple of Rated Current
16
Thermal Overload
“Must Trip” < 1 hr = 145% RC
“Must Not Trip” > 1 hr = 113% RC
3
Page 4
Accessories
The following accessories can be field
mounted on the UR Series supplementary
protectors for enhanced control and
monitoring capabilities. Field mount kits
include all necessary parts and instructions.
Accessories can be gang mounted on a single
controller with the auxiliary switch on the
Accessories
MODEL NUMBER DESCRIPTION
AU-N63UM
AU-H10UM
AU-H11UM
AU-H12UM
AU-H21UM
AU-FA12UM
AU-FA24UM
AU-FA48UM
AU-FA110UM
AU-UA120UM
Ordering Example: AU-H10UM, auxiliary switch, 3A, 240 Vac.
Neutral pole for circuit breaker.
1 Auxiliary contact, normally open
2 Auxiliary contact, 1 NO and 1 NC
3 Auxiliary contact, 1 NO and 2 NC
3 Auxiliary contact, 2 NO and 1 NC
12 V AC/DC shunt trip, 1.3A
24 V AC/DC shunt trip, 0.6A
48 V AC/DC shunt trip, 0.2A
Shunt trip, 110 to 240 Vac/dc, 277 Vac , 0.25A @ 110V 0.5A @ 240V 0.58A @ 277V
Undervoltage Trip, 120 Vac, 60 Hz.(UL Pending)
outside position. The mounting arrangement
links the internal latch‑pins for the tripping
mechanisms, ensuring simultaneous trips.
The handles are linked to simplify manual
resetting. Undervoltage trip units are available
in AC and DC and will come assembled and
calibrated to the protector.
AU-3B30UR 3-pole
supplementary protector,
30 Amp B-trip curve.
To Order Visit omega.com/circuit-breakers for Pricing and Details
Model Number
One Pole Two Pole Three Pole Rated Current
AU-1(*)05UR AU-2(*)05UR AU-3(*)05UR
AU-1(*)1UR AU-2(*)1UR AU-3(*)1UR
AU-1(*)2UR AU-2(*)2UR AU-3(*)2UR
AU-1(*)3UR AU-2(*)3UR AU-3(*)3UR
AU-1(*)4UR AU-2(*)4UR AU-3(*)4UR
AU-1(*)5UR AU-2(*)5UR AU-3(*)5UR
AU-1(*)6UR AU-2(*)6UR AU-3(*)6UR
AU-1(*)8UR AU-2(*)8UR AU-3(*)8UR
AU-1(*)10UR AU-2(*)10UR AU-3(*)10UR
AU-1(*)12UR AU-2(*)12UR AU-3(*)12UR
AU-1(*)13UR AU-2(*)13UR AU-3(*)13UR
AU-1(*)15UR AU-2(*)15UR AU-3(*)15UR
AU-1(*)16UR AU-2(*)16UR AU-3(*)16UR
AU-1(*)20UR AU-2(*)20UR AU-3(*)20UR
AU-1(*)25UR AU-2(*)25UR AU-3(*)25UR
AU-1(*)30UR AU-2(*)30UR AU-3(*)30UR
AU-1(*)32UR AU-2(*)32UR AU-3(*)32UR
AU-1(*)40UR AU-2(*)40UR AU-3(*)40UR
AU-1(*)50UR AU-2(*)50UR AU-3(*)50UR
AU-1(*)60UR AU-2(*)60UR AU-3(*)60UR
AU-1(*)63UR AU-2(*)63UR AU-3(*)63UR
Insert “B” for b-curve, “C” for c-curve and “D” for d-curve.
(*)
Ordering Examples: AU-1B05UR, one pole supplementry protector rated for 0.5 Amps B-trip curve.
AU-2D2UR, two pole supplementry protector rated for 2 Amps D-trip curve.
0.5A
1.0A
2.0A
3.0A
4.0A
5.0A
6.0A
8.0A
10A
12A
13A
15A
16A
20A
25A
30A
32A
40A
50A
60A
63A
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