Industrial Automation
Catalog Section - U906
Circuit Breakers
NRC Series
Circuit Breakers
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 improv ements,
specifications are subject to change
wihtout notice.
Circuit Breakers
Selection Guide
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Selection Guide: NRBM and NRC Series
1. For NRBM dimensions, see page N-25.
2. For NRC dimensions, see page N-26.
3. All switch only units are not CSA certified.
4.UL recognized, applicable standard: UL1077, “Supplementary Protectors.”
5. Not suitable for branch circuit protection.
Series Model NRBM NRC
Page
N-12 N-19
Appearance
Actuator Style
Lever Slide, lever
Protection Method
Electromagnetic trip
Number of Poles
1, 2, 3 1, 2
Internal Circuits
Series current trip Series current trip
Auxiliary Contact
Optional (250V AC, 5A; 50V DC, 1A)
Alarm Contact
Optional (250V AC, 5A; 50V DC, 1A)
Inertia Delay
Optional (for resistance to high inrushes) —
Time Delay Curves
2 types for DC; 3 types for AC 2 types for DC; 2 types for AC
Rated Voltage
250V AC, 50/60Hz, 65V DC
Rated Tripping Currents
1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, 40A, 50A 0.30A, 0.5A, 0.75A, 1A, 2A, 3A, 5A, 7.5A, 10A, 15A,
20A, 25A, 30A
Rated Interruption Capacity
1000A, 250V AC (50/60Hz), 65V DC
2,500A, 220V AC 50/60Hz (1-pole)
1,500A, 220V AC 50/60Hz (2-pole)
1,500A, 65V DC (1-pole)
1000A, 65V DC (2-pole)
Approvals
UL, CSA UL, CSA
Selection Guide, continued
CSA Certified
File No. LR47985
UL Recognized
File No. E68029
Circuit Breakers NRC Series
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Not suitable for branch circuit protection.
Specifications
Load Type AC DC
Protection Method Electromagnetic tripping
Internal Circuit Series current trip
Number of Poles 1, 2
Rated Voltage 250V AC, 50/60Hz, 65V DC
Rated Tripping Currents 0.30A, 0.50A, 1A, 2A, 3A, 5A, 7A, 10A, 15A, 20A, 30A
Rated Interrupting Capacity 2,500A, 250V AC, 50/60Hz
(2-pole: 1,500A)
1,500A, 65V DC
(2-pole: 1,000A)
Auxiliary Contact
Optional
SPDT contact output
250V AC 3A (resistive load)
65V DC 1A (resistive load))
Reference Temperature 40°C
Operating Temperature –10 to +60°C (avoid freezing)
Insulation Resistance 100MΩ minutes (500V megger)
Dielectric Strength Between the live part and the ground, between terminals of different poles, between termi-
nals of the same pole, and between main circuit and auxiliary contact: 2,000V AC, 1 minute
Vibration Resistance 100N (approximately 10G)
(10 to 55Hz)
Shock Resistance 500N (approximately 50G)
Life 10,000 operations minimum
Terminal Style Main terminal: M4 screw (20A maximum)
M5 screw (30A)
Auxiliary terminal: M3.5 screw
Weight (approximate) 1-pole: 115g, 2-pole: 230g
NRC Series
NRC series circuit breakers offer circuit protection which is far superior to
using fuses in applications containing relay circuits, motor circuits, heater
circuits, transformers, solenoid valves, and semiconductors.
Key features of the NRC series include:
• Mounting options include DIN rail, direct surface, or panel cut-out
• Designed for control circuit and power line protection
• Rated interrupting capacity of 2,500A (1-pole) and 1,500A (2-pole)
• Choice of slide or lever actuators
• All models equipped with reset trip indicators
• Models available for AC or DC loads
• Two curves available for long or short delay
• Available in 11 rated currents from 300mA to 30A
• Options include auxiliary contacts
• UL1077 recognized “Supplementary Protectors”
CSA Certified
File No. LR83454
UL Recognized
File No. E68029
Circuit Breakers NRC Series
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NRC series part numbers are composed of 5 part number codes. When ordering an NRC series part, select one code from each category.
Example: NRC111L- 0.30A-AA
Part Number Codes: NRC Series
1. For NRC series accessories, see page N-21.
2. For NRC series time delay curves, see page N-22.
3. For NRC series dimensions, see page N-26.
Appearance Description Part Number Code Remarks
➀ No. of Poles 1-pole 11
2-pole 21
➁ Auxiliary Contacts No 0
Yes 1
➂ Actuator Type
Slide Leave blank
Slide actuator
available only for
1-pole models.
Lever L
➃ Rated Current 0.30A, 0.50A, 1A, 2A, 3A, 5A, 7A, 10A, 15A, 20A, 30A
⑤ Time Delay Curve AC curves: AA, EA; DC curves: AD, ED
Part Numbering Guide
➃ Rated Current
AA
NRC 0.30A
⑤ Time Delay Curve
11 1
No. of Poles ➁ Auxiliary
L
Contacts ➂ Actuator
Type
Circuit Breakers NRC Series
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Part Numbers: DIN Rail and Mounting Clips
For dimensions of NRC series accessories, see page N-30.
Description Appearance Part No. Remarks
Aluminum DIN Rail (1 meter length) BNDN1000
For dimensional
drawing, see
page N-30.
DIN Rail End Clip
Metal end clip used to prevent side-to-side movement of circuit breakers when mounted on a
DIN rail. One clip required at each end.
BNL5
Panel Cut-Out Mounting Bracket
Mounting bracket used to mount circuit breaker(s) in panel cut-outs. Not applicable for models
with auxiliary contacts (NRC111, NRC111L, NRC211L). When mounting 2-pole models (NRC210L),
use two brackets side-by-side. It is recommended to use the “Fast-On Tab Terminal Adapter”
(below) when using this bracket.
NRC-M
For dimensional
drawings,
see page N-26.
Surface Mounting Bracket
Used for direct surface mounting 1-pole circuit breaker models. NRC-F
For dimensional
drawings,
see page N-26.
Fast-On Tab Terminal Adapter
Adapter used for Fast-On wiring termination. Fast-On tab extends 0.47" (12mm) in length. Cannot
be used to replace models with M5 main terminals (30A). Fast-On terminal adapter recommended
when using panel cut-out mounting bracket for rear wiring.
NRC-T
For dimensional
drawings,
see page N-30.
Jumper
Used for jumping auxiliary terminals. The rated current for jumper is 3A. NRC-J
Accessories
Internal Circuit
1-Pole
without
Auxiliary Contacts
1-Pole
with
Auxiliary Contacts
2-Pole
without
Auxiliary Contacts
2-Pole
with
Auxiliary Contacts
Load
Line
Load
Line
NCNO C
Load
Line
NC NO C
Load
Line
Circuit Breakers NRC Series
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Overcurrent — Time Delay Characteristics in Seconds (at 40°C)
1. All values above are in seconds.
2. Data in this table is equivalent to information presented in following time delay curves.
Percent of Rated Current
Curve 100% 125% 150% 200% 400% 600% 800% 1000%
DC AD No trip 40 – 240 10 – 50 3.5 – 18 0.6 – 3 0.008 – 0.5 0.005 – 0.09 0.004 – 0.07
ED No trip 0.04 – 0.4 0.025 – 0.15 0.015 – 0.06 0.007 – 0.025 0.005 – 0.018 0.004 – 0.017 0.004 – 0.017
AC AA No trip 40 – 240 10 – 50 3.5 – 18 0.9 – 4 0.35 – 2 0.07 – 1.2 0.01 – 0.5
EA No trip 0.05 – 0.4 0.03 – 0.17 0.02 – 0.07 0.008 – 0.025 0.005 – 0.018 0.004 – 0.017 0.004 – 0.017
Time Delay Curves (numerical equivalent)
Time Delay Curves
DC Time Delay Curves AC (50/60 Hz) Time Delay Curves
1,000
100
10
1
0.1
0.01
100
125
150
200 300 400 500 600 700 800 900 1,000
Time in Seconds
Percent of Rated Current
AD Delay Curve
at 77˚F (25˚C)
1,000
100
10
1
0.1
0.01
100
125
150
200 300 400 500 600 700 800 900 1,000
Time in Seconds
Percent of Rated Current
EA Delay Curve
at 77˚F (25˚C)
1,000
100
10
1
0.1
0.01
100
125
150
200 300 400 500 600 700 800 900 1,000
Time in Seconds
Percent of Rated Current
ED Delay Curve
at 77˚F (25˚C)
1,000
100
10
1
0.1
0.01
100
125
150
200 300 400 500 600 700 800 900 1,000
Time in Seconds
Percent of Rated Current
AA Delay Curve
at 77˚F (25˚C)
Circuit Breakers NRC Series
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Resistance and Impedance Characteristics
Coil Impedance (at 40°C)
Tolerance: ±10% (0.3A to 3A), ±25% (5A to 30A).
Voltage Drop Due to Coil Impedance
T
he internal impedance of a circuit breaker tends to be larger for a smaller
rated current. Therefore, when low rated circuit breakers are used, the voltage
drop should be taken into consideration.
Rated
Current
AC Impedance
(50/60Hz) DC Resistance
0.30A 15.1Ω25.6Ω
0.50A 5.58Ω9.04Ω
1A 1.54Ω2.33Ω
2A 0.341Ω0.548Ω
3A 0.162Ω0.261Ω
5A 0.061Ω0.099Ω
7A 0.031Ω0.048Ω
10A 0.017Ω0.026Ω
15A 0.008Ω0.013Ω
20A 0.0058Ω0.0075Ω
30A 0.0039Ω0.0046Ω
100
10
1
0.1
0.01
0.0001 0.001 0.01 0.1 1.0 10
Rated Current (A)
AC Impedance at 40°C
100
100
10
1
0.1
0.01
0.0001 0.001 0.01 0.1 1.0 10
Rated Current (A)
Resistance (Ω)
DC Resistance at 40°C
100
Temperature Correction Curve
200
100
80
60
40
–40 –20 025 50 70
Rated Current (A)
Ambient Temperature (°C)
400
90
Curves AA, AD
(on 125% rated current)
Circuit Breakers Instructions
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.
Description Circuit Example
Series Trip
This is the most common circuit breaker, providing excellent overload and short circuit
protection. It can also be used as an ON/OFF switch.
Series Trip with Auxiliary Contact
Since the auxiliary contact operation is interlocked with the ON/OFF of the main contactor,
circuit breaker operation can be monitored by a lamp or buzzer. This circuit breaker can
also be used to control auxiliary circuits up to 250V AC/5A (resistive load).
Series Trip with Alarm Contact
Since the alarm contact is electrically independent of the main contactor, but actuates
when the protective element operates. The alarm can be used with a lamp or buzzer to
monitor trip operations, and can also be used for controlling alarm circuits. The contact
rating is 250V AC/5A (resistive load).
Instructions: All Series
General
IDEC’s circuit breakers have been developed for the protection of electrical
circuits and small-sized electrical equipment and provide excellent protection
against overloads and short-circuits.
Additionally, IDEC’s circuit breakers are designed to suit specific needs. Each
series offers unique circuit protection characteristics and a choice of actuator
styles.
IDEC’s Circuit Breaker Features
• Various models are available with different internal circuits, tripping charac-
teristics, and rated currents
• 1- to 3- multi-pole
• Inertia delay
• Auxiliary contacts and alarm contacts
• The electromagnetic tripping system is not affected by ambient temperature
• Safe trip-free mechanism
• Vibration- and impact-resistant design
• When using accessories such as plug-in bases, flush plates, and colored
caps, a variety of mounting styles is possible — such as DIN rail mount-
ing, snap mounting into panel cut-outs, and color-coded arrangement on
the panel
Mounting Instructions: Installation Angle
Designed to be mounted on a vertical surface, the circuit breakers should be
mounted on a surface within 10° of the vertical plane. If the circuit breaker is
mounted on a horizontal surface or at any angle other than the specified
angle, its characteristics will be changed.
Multi-Pole Assemble
Multi-pole types such as 2- or 3-pole should be assembled by IDEC.
Because of their characteristics, 1-pole breakers cannot be com-
bined to produce multi-pole units.
Applications
The IDEC NRA circuit breaker series features superior overload and short-cir-
cuit protection. Many combinations of protection mechanisms and internal
circuit connections enable wide applications.
• Precision measuring instruments: electronic counters, projection
instruments, oscilloscopes, industrial instrumentation, and analytic
devices
• Electronic communication devices: facsimile machines, computers,
recorders
• Industrial machinery: printers, elevators, cranes
• Chemical and food industry machines: vacuum devices, wrappers,
centrifuges, agitators
• Machine tools: mill grinders, drills, presses
• Business machines: automatic vendors, medical equipment, beauty
salon equipment, entertainment games
• Other: office equipment, air-conditioners, conveyor belts, and many more
How the Breaker Operates
IDEC’s hydraulic magnetic circuit breakers operate like a solenoid coil. The
coil unit consists of an oil-filled tube with a metal core at one end and a pole
piece and armature at the opposite end with a spring in between.
When a current load passes through the coil winding, it creates a magnetic
field. As long as the current load is either at or below the nominal rating of
the breaker, the metal core will remain stationary.
If the current load increases beyond the nominal rating, the strength of the
magnetic field causes the core to move toward the pole-end of the tube. The
oil viscosity regulates the core’s movement through the tube, thereby regulat-
ing the time delay. As the percentage of current load increases, the required
trip time of the breaker decreases and vice versa.
When the current reaches the overload rating, the metal core will meet the
pole piece at the opposite end of the tube. At this point, the armature is
attracted to the same pole piece, tripping the breaker.
In case of sudden short circuit, the magnetic field created will instantly trip
the breaker.
Internal Circuits Overview
Load
Load A
Load B
Load A
Load B
Circuit Breakers Dimensions
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NRC110
Slide Actuator
1-Pole without Auxiliary Contacts
Installation Angle: Cir cuit break ers ar e designed to operate on a vertical surface .
The mounting angle should not exceed a vertical plane by more than 10°.
Dimensions: NRC Series
NRC110L
Lever Actuator
1-Pole without Auxiliary Contacts
NRC111
Slide Actuator
1-Pole with Auxiliary Contacts
Circuit Breakers Dimensions
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Dimensions: NRC Series, continued
NRC211L
Lever Actuator
2-Pole with Auxiliary Contacts
NRC111L
Lever Actuator
1-Pole with Auxiliary Contacts
Installation Angle: Circuit breakers are designed to operate on a vertical surface. The mount-
ing angle should not exceed a vertical plane by more than 10°.
NRC210L
Lever Actuator
2-Pole without Auxiliary Contacts
Circuit Breakers Dimensions
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NRBM Series
NRC Series
All drawings are not to scale unless scale is indicated.
0.745" (19.1mm)
1.38" (35.5mm)
2.04" (52.3mm)
1-Pole: 0.764"
(19.6mm)
2-Pole: 1.51" (38.7mm)
3-Pole: 2.25" (57.8mm)
NRBM
0.33" (8.4mm)
Panel Cut-Outs, continued
2-M4 Holes
.472" (12mm)
2.11" (54mm)
(4.5mm)
Surface Mounting Hole Layout 1-Pole
2-M4 Holes
1.45" (37mm)
2.11" (54mm)
(4.5mm)
Surface Mounting Hole Layout 2-Pole
Scale: Full Size
Circuit Breakers Dimensions
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Panel Cut-Out (when using NRC-M)
BNDN1000 Aluminum DIN Rail
NRT: Screw Terminal Adapter (for use with NRA Series)
Panel Cut-Out Adapter (NRC-M)
Surface Mounting Bracket (NRC-F )
1.81" (46mm)
2.2" (56mm)
1.00" (25.5mm)
1-Pole
4–Ø0.16" (4mm)
1.81" (46mm)
2.2" (56mm)
2.00" (51mm)
2-Pole
4–Ø0.16" (4mm)
1.00" (25.5mm)
Accessory Dimensions
A
C
Overall length 39.4" (1000mm)
K
F
H
G
BD
H
1.For use on main terminals only.
2.Includes M3.5 clamp screw.
NRC-M Panel Mounting
NRC-F Surface Mounting
Length in
Inches (mm)
A 1.4" (35mm)
B 1.14" (29mm)
C 0.78" (23mm)
D 1.2" (31mm)
E 0.41" (10.5mm)
F 0.11" (3mm)
G 2" (51mm)
H 0.47" (12mm)
K 0.16" (4mm)
