Circuit Breakers
Industrial Automation
Catalog Section - U906
Circuit Breakers
NRA Series
For up-to-date information, or to request a
full copy of this catalog, contact us at
www.idec.com
or
800-262-IDEC.
.
Due to continuous product improvements,
specifications are subject to change
wihtout notice.
Circuit Breakers
Selection Guide
Selection Guide: NRA Series
Series Model
Page
Selection Guide
NRAS
N-4
NRAN
N-4
NRAR
N-4
Appearance
Actuator Style
Number of Poles
Protection Method
Internal Circuits
Auxiliary Contact
Alarm Contact
Inertia Delay
Time Delay Curves
Rated Voltage
Rated Tripping Currents
Rated Interruption Capacity
Approvals
Lever
1, 2, 3
Lever
1, 2, 3
Electromagnetic trip
Series current trip
Rocker
(non-illuminated
and illuminated)
1
Optional (250V AC, 5A; 50V DC, 1A)
Optional (250V AC, 5A; 50V DC, 1A)
Optional (for resistance to high in rushes)
2 types for DC; 3 types for AC
250V AC, 50/60Hz, 65V DC
0.30A, 0.50A, 0.75A
1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A
1,000A, 250V AC, 50/60Hz, 65V DC
UL, CSA
UL
1. For dimensions, see page N-25.
2. NRAR is not CSA certified.
3. UL recognized, applicable standard: UL1077, “Supplementary Protectors.”
4. Not suitable for branch circuit protection.
N
UL Recognized
File No. E68029
E74843
CSA Certified
File No. LR47985
Pending
* NRA Series Only
N-2
www.idec.com
USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
Circuit Breakers
NRA Series
NRA Series
Key features of the NRA series include:
• Available in 5 different styles
• Excellent overload and short circuit protection
• Small size and high-efficiency
• Life expectancy of over 10,000 operations
•
UL1077 recognized “Supplementary Protectors”
UL Recognized
File No. E68029
E74843
CSA Certified
File No. LR47985
NRAS
NRAN
NRAR
Rocker
NRAR
Illuminated
Rocker
(neon lamp)
Electromagnetic tripping
Series current trip
NRAS and NRAN: 1, 2, 3
NRAR: 1
250V AC, 50/60Hz, 65V DC
0.30A, 0.50A, 0.75A
1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A
250V AC, 50/60Hz, 1,000A
65V DC, 1,000A
SPDT microswitch 250V AC, 5A (resistive load)
50V DC, 1A (resistive load)
25°C
–40 to +85°C (avoid freezing)
100M
Ω
minute (measured with 500V megger)
Between main circuit terminals: 2,000V AC, 1 minute
Between main circuit and auxiliary contact: 2,000V AC, 1 minute
100N (approximately 10G) (10 to 100Hz)
1,000N (approximately 100G)
Minimum 10,000 cycles (at 6 operations per minute)
Main terminal: Quick-connect receptacle 0.250" (accepts M3.5 screw terminal adapter)
Auxiliary contact, alarm contact: Quick-connect receptacle 0.080"
Neon: 120, 240V AC, 50/60Hz
LED: 12, 24V DC
Protection Method
Internal Circuit
Number of Poles
Rated Voltage
Rated Tripping Currents
Rated Interrupting Capacity
Specifications
Auxiliary Contact
Alarm Contact
Reference Temperature
Operating Temperature
Insulation Resistance
Dielectric Strength
Vibration Resistance
Shock Resistance
Life Expectancy
Termination
N
Illumination Voltage
(
NRAR illuminated units)
1. NRAR is not CSA certified.
2. Not suitable for branch circuit protection.
N-4
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USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
Circuit Breakers
Part Numbering Guide
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 -3
NRA Series
NRAR
➀
Model
1
➁
Poles
1
Circuit
11
Alarm Contacts
F
|
Inertia
Delay
30A
➅
Rated Current
AA
➆
Time Delay
Curve
3
Pilot
Light *
➂
Internal
➃
Auxiliary and
Part Number Codes: NRA Series
Description
Toggle (round cutout)
NRAS
Part Number Code
NRAN
NRAR
1
2
3
1
00
11
21
Blank
F
0.30A, 0.50A, 0.75A, 1A, 2A, 3A, 5A,
7.5A, 10A, 15A, 20A, 25A, 30A
AD, MD
AA, BA,MA
1
2
Remarks
➀
Model
Toggle (rectangular cutout)
Rocker
1-pole
➁
No. of Poles
➂
Internal Circuit
➃
Auxiliary and
Alarm Contacts
|
Inertia Delay
➅
Rated Current
➆
Time Delay
Curve
Pilot Light*
2-pole
3-pole
Series current trip
Without
With auxiliary contact
With alarm contact
Without inertia delay
With inertia delay
Rated current (current trip)
DC curves
AC curves
With neon light 120V AC (50/60Hz)
With neon light 240V AC (50/60Hz)
NRAR available in 1-pole only.
All multi-pole circuit breakers are simultaneous
throw/simultaneous break.
All levers are mechanically interlocked.
All current ratings must be listed in amps (A).
Example conversions: 50mA = 0.05A, 300mA = 0.30A.
For time delay curves, see page N-9.
* Applicable to illuminated NRAR only.
1. For NRA series accessories, see page N-7.
2. For NRA series time delay curves, see page N-9.
3. For NRA series dimensions, see page N-25.
4. Not suitable for branch circuit protection.
5. UL recognized, applicable standard: UL1077, “Supplementary Protectors.”
6. NRAR is not CSA certified.
N
www.idec.com
USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
N-5
Circuit Breakers
Information About Circuit Breakers
NRA Series
Time Delay Curve Descriptions
Time Delay Curve
AD, AA
BA
MD, MA
With Inertia Delay
NRA Application
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.
16,000
Inertia Delay Descriptions
Percent of Rated Current
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 the specified interruption
on the rated overcurrents.
Specify inertia delay by inserting an “F” in the part number as shown in Part Number Guide
on previous page.
14,000
12,000
10,000
8,000
6,000
4,000
2,000
1
2
Pulse
Width
Pulse Peak
Current
(duration)
3 4 5 6 7 8
Pulse Width (ms)
9
10
Pulse Peak Current
1. Percent of Rated Current =
x 100%
Protector Rated Current
2. Based on sinusoidal or parabolic pulse profile.
Notes
Multi-Pole
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.
Auxiliary and Alarm Contacts
Multi-pole units can incorporate auxiliary and alarm contacts.
Auxiliary and alarm contacts will not work with IDEC’s DIN rail adapters.
N
N-6
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USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
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