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 Industrial Automation Catalog Section - U906 Circuit Breakers Selection Guide Selection Guide Selection Guide: NRA Series Series Model NRAS NRAN NRAR N-4 N-4 N-4 Actuator Style Lever Lever Rocker (non-illuminated and illuminated) Number of Poles 1, 2, 3 1, 2, 3 1 Page Appearance Protection Method Electromagnetic trip Internal Circuits 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 in rushes) Time Delay Curves 2 types for DC; 3 types for AC Rated Voltage 250V AC, 50/60Hz, 65V DC 0.30A, 0.50A, 0.75A 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A Rated Tripping Currents Rated Interruption Capacity 1,000A, 250V AC, 50/60Hz, 65V DC Approvals 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 N-2 www.idec.com CSA Certified File No. LR47985 Pending * NRA Series Only 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" NRAS NRAN NRAR Rocker NRAR Illuminated Rocker (neon lamp) Protection Method Internal Circuit Electromagnetic tripping Number of Poles NRAS and NRAN: 1, 2, 3 NRAR: 1 Rated Voltage 250V AC, 50/60Hz, 65V DC Rated Tripping Currents 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 Specifications CSA Certified File No. LR47985 Series current trip Rated Interrupting Capacity Auxiliary Contact Alarm Contact Reference Temperature Operating Temperature Insulation Resistance SPDT microswitch 250V AC, 5A (resistive load) 50V DC, 1A (resistive load) Dielectric Strength Between main circuit terminals: 2,000V AC, 1 minute Between main circuit and auxiliary contact: 2,000V AC, 1 minute Vibration Resistance Shock Resistance Life Expectancy 1,000N (approximately 100G) Termination Illumination Voltage (NRAR illuminated units) N UL Recognized File No. E68029 E74843 25C -40 to +85C (avoid freezing) 100M minute (measured with 500V megger) 100N (approximately 10G) (10 to 100Hz) 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 1. NRAR is not CSA certified. 2. Not suitable for branch circuit protection. N-4 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRA Series 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 NRAR 1 Model Poles 11 1 Internal Auxiliary and Circuit Alarm Contacts Part Number Codes: NRA Series Description Model No. of Poles Internal Circuit Auxiliary and Alarm Contacts F 30A AA 3 Inertia Delay Rated Current Time Delay Curve Pilot Light * Part Number Code Toggle (round cutout) NRAS Toggle (rectangular cutout) NRAN Rocker NRAR 1-pole 1 2-pole 2 3-pole 3 Series current trip 1 Without 00 With auxiliary contact 11 With alarm contact 21 Without inertia delay Blank With inertia delay F Rated Current Rated current (current trip) 0.30A, 0.50A, 0.75A, 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A Time Delay Curve DC curves AD, MD AC curves AA, BA,MA With neon light 120V AC (50/60Hz) 1 With neon light 240V AC (50/60Hz) 2 Inertia Delay Pilot Light* Remarks 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 NRA Series Information About Circuit Breakers Time Delay Curve Descriptions Time Delay Curve NRA Application AD, AA Common curves used in molded-case circuit breakers. BA 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. MD, MA Suited for motor loads that draw high inrush currents lasting a considerable length of time. With Inertia Delay 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 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. Percent of Rated Current Inertia Delay Descriptions Pulse Peak Current 14,000 Pulse Width 12,000 (duration) 10,000 8,000 6,000 4,000 2,000 1 2 3 4 5 6 7 8 Pulse Width (ms) 9 10 1. Percent of Rated Current =Pulse Peak 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. N 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-6 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRA Series Accessories Part Numbers: NRA Series Accessories Appearance Description Red Color Caps (NRAS only) Part No. Remarks NR5R Colored Cap O 0.62" (15.8mm) Blue NR5S Panel Yellow NR5Y White NR5H Colored caps fit onto NRAS circuit breakers for color coding circuits and improving the appearance of the panel. Terminal Socket MS-1C For connection with auxiliary or alarm contact terminals. Screw Terminal Adapter (1 pair) NRT For use on main terminals only. Includes M3.5 clamp screw. For dimensions see page N-25. Part Numbers: NRA Mounting Accessories Description Panel Mount Flush Plate Appearance 0.936" (24mm) 1.89" (48.5mm) For Model No. of Poles Part No. NRAN NRAR 1-pole NR31 NRAN 2-pole NR32 NRAN 3-pole NR33 1-pole NR21 2.65" (68mm) 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. 2.46" (63mm) 1.50" 0.757" (19.4mm) (38.5mm) Mounting Clip 2.26" (58mm) NRAS NRAN DIN Rail Plug-in Base 3-Pole DIN Rail 1-Pole 2-Pole NR22 3-pole NR23 1-pole NR211 Hold-Down Spring NRAR Surface Mount Plug-in Base 2-pole 1.Furnished with a holddown 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 or alarm contacts. 1-pole NUS1 NRAS NRAN 2-pole NUS2 3-pole NUS3 NRAR 1-pole NUS11 For dimensions of NRA series accessories and panel cut-out layouts, see drawings starting on page N-25. www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-7 N Circuit Breakers NRA Series Internal Circuits and Terminal Arrangements: NRAS and NRAN Series Series Current Trip Series Current Trip with Auxiliary Contacts LINE Series Current Trip with AlarmContacts LINE LINE NC NO NO NC C C LOAD LOAD LOAD Internal Circuits and Terminal Arrangements: NRAR Series Series Current Trip with Alarm Contacts Series Current Trip with Auxiliary Contacts Series Current Trip LOAD LOAD LOAD Lead Wire A Lead Wire A (+) Lead Wire B Lead Wire B C C NC NO NO NC (-) LINE LINE LINE Pilot Lights (NRAR only) Lead Wire Pilot Light A B Neon (120V AC) White White Neon (240V AC) Black Black Dashed lines represent NRAR illuminated rocker units. Lead wires for neon pilot light/LED are colorcoded as shown above. N N-8 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRA Series Time Delay Curves (numerical equivalent) Overcurrent -- Time Delay Characteristics in Seconds (at 25C) Percent of Rated Current 100% 125% 150% 200% 400% 600% 800% 1000% AD No trip 10 - 130 6 - 55 2.6 - 20 0.5 - 3.5 0.12 - 1.4 0.008 - 0.1 0.005 - 0.05 MD No trip 35 - 400 20 - 200 7 - 60 1.3 - 8 0.2 - 3 0.01 - 0.25 0.006 - 0.08 AA No trip 10 - 120 6 - 45 2.2 - 15 0.3 - 2 0.05 - 0.55 0.007 - 0.13 0.005 - 0.04 BA No trip 0.75 - 10 0.45 - 3.5 0.22 - 1.3 0.045 - 0.22 0.012 - 0.12 0.005 - 0.06 0.004 - 0.03 MA No trip 60 - 900 30 - 260 9 - 70 1.5 - 8 0.18 - 2.5 0.009 - 0.25 0.006 - 0.08 AC (50/60Hz) DC Curve 1. All values above are in seconds. 2. Data in this table is equivalent to information presented in following time delay curves. DC Time Delay Curves 1,000 1,000 AD Delay Curve MD Delay Curve at 77F (25C) 100 at 77F (25C) 10 10 Time in Seconds Time in Seconds 100 1 0.1 1 0.1 0.01 0.01 100 125 200 150 300 400 500 600 700 800 900 1,000 Percent of Rated Current 100 200 125 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 N www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-9 Circuit Breakers NRA Series AC (50/60Hz) Time Delay Curves 1,000 1,000 BA Delay Curve AA Delay Curve at 77F (25C) 100 at 77F (25C) Time in Seconds Time in Seconds 100 10 1 0.1 10 1 0.1 0.01 0.01 100 125 200 300 400 500 600 700 800 100 125 900 1,000 Percent of Rated Current 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 150 1,000 MA Delay Curve at 77F (25C) 100 Time in Seconds 10 1 0.1 0.01 100 200 125 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 N N-10 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRA Series Resistance and Impedance Characteristics Coil Data for Series Current Trip at 25C Rated AC Impedance DC Resistance Current (50/60Hz) 0.30A 9.67 9.82 0.50A 3.24 3.36 0.75A 1.45 1.49 1A 0.90 0.92 2A 0.21 0.21 3A 0.09 0.092 5A 0.036 0.036 7.5A 0.017 0.018 0.012 0.012 0.0066 0.0068 20A 0.0048 0.0048 25A 0.0043 0.0043 30A 0.0036 0.0041 Curves AD, MD 10 1 0.1 0.01 0.001 0.01 1 0.1 Coil Resistance () 10 100 10 100 100 Tolerance 25% (up to 20A), 50% (25A and over). Rated Current (A) 10A 15A 100 Rated Current (A) Curves AD, MD Curves AA, BA, MA Coil Resistance at 25C Curves AA, BA, MA 10 1 0.1 Time Delay Curve and Ambient Temperature Since NRA series circuit breakers employ an electromagnetic tripping system, the rated current (trip current) is not affected by the ambient temperature, but the time delay varies with the oil viscosity in the tube. Lower oil viscosity at higher temperatures results in shorter delay; whereas at lower temperatures, the delay will be prolonged. The time delay curves, shown starting on page N9, are at 25C. Time delay curves can be corrected. 0.01 0.001 0.01 Curves AD, AA, BA (on 125% rated current) 400 200 100 80 60 40 -40 www.idec.com 1 0.1 Impedance () Temperature Correction Curves Rated Current (A) Voltage Drop Due to Resistance or Impedance The internal resistance or impedance of a circuit breaker tends to be larger for a smaller rated current. Therefore, when circuit breakers with a small rated current are used, voltage drop should be taken into consideration. Internal resistance also varies with time delay curves, even at the same rated current. This should also be considered during installation. -20 25 50 0 Ambient Temperature (C) 70 USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC 90 N N-11 Circuit Breakers Instructions 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 characteristics, 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 mounting, 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 combined to produce multi-pole units. Applications The IDEC NRA circuit breaker series features superior overload and short-circuit 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 regulating 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 Description Circuit Example Series Trip Load N 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 Load A 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). Load B Series Trip with Alarm Contact Load A 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). Load B N-24 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers Dimensions Dimensions Dimensions: NRA Series 0.250" Tab Terminal 0.110" Tab Terminal 1.56" (40mm) 0.745" (19.1mm) 60 1.20" (30.8mm) 1.20" (30.8mm) 1-pole: 0.745" (19.1mm) 1.56" (40mm) 2-pole: 1.49" (38.2mm) 1.93" (49.5mm) 3-pole: 2.23" (57.3mm) 0.745" (19.1mm) 0.745" (19.1mm) 2.11" (54mm) 0.745" (19.1mm) 0.250" Tab Terminal 0.110" Tab Terminal 1.56" (40mm) 60 1.23"(31.5mm) 1.65"(42.2mm) 2.03" (52mm) NRAN 0.683" (17.5mm) 1.20" (30.8mm) 1-pole: 0.745" (19.1mm) 1.60" (41mm) 2-pole: 1.49" (38.2mm) 1.97" (50.5mm) 3-pole: 2.23" (57.3mm) 0.644" (16.5mm) 2.11" (54mm) 0.250" Tab Terminal ON 0.110" Tab Terminal 0.78" (20mm) 1.23" (31.5mm) 2.03" (52mm) NRAR 1.65" (42.2mm) 0.745" (19.1mm) LED OFF 1.56" (40mm) 2.03" (52mm) NRAS 0.745" (19.1mm) 1.65" (42.2mm) 0.745" (19.1mm) 2.18" (56mm) 0.417" (10.7mm) 2.55" (65.5mm) 2.69" (69mm) Dimensions: NRBM Series 0.745" (19.1mm) 0.745" (19.1mm) N 0.745" (19.1mm) M5 Stud 1.37" (35mm) 60 1.92" (49.2mm) 2.04" (52.3mm) NRBM 2.46" (63mm) 0.110" Tab Terminal 1.35" (34.7mm) 1-pole: 0.745" (19.1mm) 2-pole: 1.49" (38.2mm) 1.85" (47.5mm) 3-pole: 2.23" (57.3mm) 0.8" (20.5mm) www.idec.com 0.624" (16mm) 2.48" (63.5mm) USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-25 Circuit Breakers Dimensions Panel Cut-Outs Installation Angle: Circuit breakers are designed to operate on a vertical surface. The mounting angle should not exceed a vertical plane by more than 10. NRA Series NRAS O0.158" (4mm) Mounting Holes NRAR, NRAN 0.745" (19.1mm) O0.156" (4mm) Mounting Holes 0.745" (19.1mm) 0.20" (5.1mm) 1.26" (32mm) 1.05" (26.7mm) 1.66" (42.2mm) 1.66" (42.2mm) 0.630" (16mm) 1-Pole 2-Pole 3-Pole 0.745" (19.1mm) 1.49" (38.2mm) 2.23" (57.3mm) NR31, NR32, NR33 -- Panel Mount Flush Plate 2.09" (53.5mm) 0.764" (19.6mm) 1.51" (38.7mm) 2.25"(57.8mm) Maximum Mounting Distance N Model A B NRAS 3.02" (77.5mm) 3.57" (91.5mm) NRAN 3.02" (77.5mm) 3.57" (91.5mm) NRAR 3.38" (86.7mm) 3.93" (100.7mm) N-28 www.idec.com Schematics in Inches (mm) Mounting to Panel Surface Mounting to DIN Rail USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC