NRA series part numbers are composed of up to 8 part number codes. When ordering an NRA series part, select one code from each category.
Example: NRAR 1 1 11 -F - 30A -AA -1
NRAR
j
Model
1
k
Poles
1
l
Internal
Circuit
11
m
Auxiliary and
Alarm Contacts
—
F
—
30A
o
Rated Current
—
AA
—
1
q
Pilot Light*
n
Inertia Delay
p
Time Delay Curve
Part Number Codes: NRA Series
Description
Part Number Code
NRAS
NRAN
1
2
3
1
00
11
21
Blank
F
NRAR available in 1-pole only.
All multi-pole circuit breakers are simultaneous
throw/simultaneous break.
All levers are mechanically interlocked.
NRAR
Remarks
Display Lights
Lever (round cutout)
j
Model
Lever (rectangular cutout)
Rocker
1-pole
k
No. of Poles
l
Internal Circuit
2-pole
3-pole
Series current trip
Without
With auxiliary contact
With alarm contact
n
Inertia Delay
o
Rated Current
p
Time Delay Curve
q
Pilot Light*
Without inertia delay
With inertia delay
Rated current (current trip)
AC curves
DC curves
With neon light 120V AC (50/60Hz)
With neon light 240V AC (50/60Hz)
Relays & Sockets
m
Auxiliary and
Alarm Contacts
AA, BA,MA
AD, MD
1
2
po
0.3A, 0.5A, 0.75A, 1A, 2A, 3A, 5A,
7.5A, 10A, 15A, 20A, 25A, 30A
ec
om
Timers
Circuit Breakers
Terminal Blocks
884
on
lin
1. For NRA series accessories, see page 886.
2. For NRA series time delay curves, see page 888.
3. For NRA series dimensions, see page 890.
4. Not suitable for branch circuit protection.
5. UL recognized, applicable standard: UL1077, “Supplementary Protectors.”
www.idec.com
ne
nt
s.
Auxiliary contact switches change state with lever and/or overload condition
Alarm contact switches change state only with overload condition
All current ratings must be listed in amps (A).
Example conversion: 300mA = 0.30A.
For time delay curves, see page 888.
*Applicable to illuminated NRAR only.
co
m
Circuit Breakers
Information About Circuit Breakers
NRA Series
Switches & Pilot Lights
Time Delay Curve Descriptions
Time Delay Curve
AD, AA
BA
MD, MA
With Inertia Delay (F)
Common curves used in molded-case circuit breakers.
Response to overcurrent is quite fast. Suited for protection of semiconductor circuits with very little overload tolerance. If overcurrents are expected to
flow, fuses may be required according to the circuit characteristics.
Suited for motor loads that draw high inrush currents lasting a considerable length of time.
Designed not to trip on 20 times the rated current (peak value) for a duration of 8ms. Suited for transformer and lamp loads that draw steep inrush currents.
NRA Application
16,000
Display Lights
14,000
Percent of Rated Current
Pulse Peak
Current
12,000
10,000
8,000
6,000
4,000
2,000
Inertia Delay Description
Circuit breakers equipped with inertia delay do not respond to high inrush currents such as
those produced by transformer, lamp, or motor loads, but perform specified interruption on
rated overcurrents.
nt
s.
co
m
Pulse
Width
(duration)
Relays & Sockets
ne
Specify inertia delay by inserting an “F” in the part number as shown in Part Number Guide on
previous page.
1
2
3 4 5 6 7 8
Pulse Width (ms)
9
10
po
1. P ercent of Rated Current
=
Pulse Peak Current
Protector Rated Current
x 100%
ec
om
2. Based on sinusoidal or parabolic pulse profile.
Timers
Notes
Multi-Pole
Multi-pole units can incorporate auxiliary and alarm contacts.
Auxiliary and alarm contacts will not work with IDEC’s DIN rail adapters.
on
Auxiliary and Alarm Contacts
lin
Multi-pole types such as 2- or 3-pole should be assembled by IDEC.
Because of their characteristics, 1-pole breakers cannot be combined to provide multi-pole units.
Terminal Blocks
Circuit Breakers
USA: 800-262-IDEC
Canada: 888-317-IDEC
885
NRA Series
Accessories
Switches & Pilot Lights
Circuit Breakers
Part Numbers: NRA Series Accessories
Description
Red
Color Caps
(NRAS only)
Blue
Yellow
White
Appearance
Ø 0.62"
(15.8mm)
Part No.
NR5R
NR5S
NR5Y
NR5H
Panel
Remarks
Colored
Cap
Colored caps fit onto NRAS circuit breakers for color coding circuits
and improving the appearance of the panel.
Display Lights
Screw Terminal
Adapter (1 pair)
NRT
Part Numbers: NRA Mounting Accessories
Description
Appearance
68 mm
24 mm
48.5 mm
Relays & Sockets
NRAN
NRAR
NRAN
ne
Panel Mount
Flush Plate
63 mm
po
NRAN
For 1-pole
ec
om
For 3-pole
For 2-pole
(Black plastic plate)
Timers
Mounting Clip
DIN Rail
Plug-in Base
NRAS
NRAN
NRAR
NRAS
NRAN
NRAR
nt
s.
1-pole
NR31
2-pole
NR32
3-pole
NR33
1-pole
2-pole
3-pole
1-pole
1-pole
2-pole
3-pole
1-pole
NR21
NR22
NR23
NR211
NUS1
NUS2
NUS3
NUS11
or alarm contacts.
For
Model
Number
of Poles
Part
Number
co
m
For use on main terminals only.
Includes M3.5 clamp screw.
For dimensions see page 892.
Remarks
Use of a flush plate makes snap-in mount possible for
NRAN, and NRAR circuit breakers (tightening screws not
necessary).
Multiple units can mount in a single panel cut-out.
1.
Furnished with a hold-down spring.
2.
Applicable only for series trip units up to 20 amps.
3.
Not applicable for NRAR lighted series.
4.
Not for use with circuit breakers incorporating auxiliary
on
For 1-pole
Surface Mount
Plug-in Base
DIN Rail
Terminal Blocks
For dimensions of NRA series accessories and panel cut-out layouts, see drawings starting on page 891.
Circuit Breakers
886
lin
For 2-pole
For 3-pole
Hold-Down Spring
www.idec.com
Circuit Breakers
Internal Circuits and Terminal Arrangements: NRAS and NRAN Series
NRA Series
Switches & Pilot Lights
Series Current Trip
Series Current Trip
with Auxiliary Contacts
Series Current Trip
with Alarm Contacts
LINE
LINE
LINE
NC
NO
C
NO
NC
Display Lights
C
LOAD
LOAD
Internal Circuits and Terminal Arrangements: NRAR Series
Series Current Trip
Series Current Trip
with Auxiliary Contacts
Series Current Trip
with Alarm Contacts
Pilot Lights (NRAR only)
Lead Wire
nt
s.
co
m
LOAD
Relays & Sockets
LOAD
LOAD
ne
LOAD
(Lead wire A)
(Lead wire B)
Pilot Light
Neon
(120V AC)
Neon
(240V AC)
A
White
Black
B
White
Black
(~)
(Lead wire A)
(Lead wire B)
ec
om
po
C
C
NC
NO
LINE
(~)
NO
NC
Dashed lines represent NRAR
illuminated rocker units. Lead wires
for neon pilot light as shown above.
Timers
LINE
on
lin
LINE
Terminal Blocks
Time Delay Curves (numerical equivalent)
Overcurrent — Time Delay Characteristics in Seconds (at 25ºC)
Percent of Rated Current
Curve
AC (50/60Hz)
AA
BA
MA
AD
MD
100%
No trip
No trip
No trip
No trip
No trip
125%
10 – 120
0.75 – 10
60 – 900
10 – 130
35 – 400
150%
6 – 45
0.45 – 3.5
30 – 260
6 – 55
20 – 200
200%
2.2 – 15
0.22 – 1.3
9 – 70
2.6 – 20
7 – 60
400%
0.3 – 2
0.045 – 0.22
1.5 – 8
0.5 – 3.5
1.3 – 8
600%
0.05 – 0.55
0.012 – 0.12
0.18 – 2.5
0.12 – 1.4
0.2 – 3
800%
0.007 – 0.13
0.005 – 0.06
0.009 – 0.25
0.008 – 0.1
0.01 – 0.25
1000%
0.005 – 0.04
0.004 – 0.03
0.006 – 0.08
0.005 – 0.05
0.006 – 0.08
Circuit Breakers
DC
1. All values above are in seconds.
2. Data in this table is equivalent to information presented in the time delay curves shown on page 888.
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