Circuit Breakers NRA Series NRA Series Key features of the NRA series include: * Available in 4 different styles * Excellent overload and short circuit protection * Small size and high-efficiency * Life expectancy of over 10,000 operations * UL1077 recognized "Supplementary Protectors" * VDE certified to EN60934 NRAN NRAS File No. E68029 license #116381 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 0.3A, 0.5A, 0.75A 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A 250V AC, 50/60Hz, 1,000A 65V DC, 1,000A Specifications Rated Interrupting Capacity Series current trip 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 100N (approximately 10G) (10 to 100Hz) Termination Main terminal: Quick-connect receptacle 0.250" (accepts M3.5 screw terminal adapter) Auxiliary contact, alarm contact: Quick-connect receptacle 0.080" Illumination Voltage (NRAR illuminated units) Neon: 120, 240V AC, 50/60Hz 25C -40 to +85C (avoid freezing) 100M minute (measured with 500V megger) 1,000N (approximately 100G) Minimum 10,000 cycles (at 6 operations per minute) N Circuit Breakers Not suitable for branch circuit protection. www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-3 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 -31 NRAR 1 Model Poles 11 1 Internal Auxiliary and Circuit Alarm Contacts Part Number Codes: NRA Series Description Model No. of Poles F 30A AA 1 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 Remarks NRAR available in 1-pole only. All multi-pole circuit breakers are simultaneous throw/simultaneous break. All levers are mechanically interlocked. 3-pole 3 Series current trip 1 Without 00 With auxiliary contact 11 Auxiliary contact switches change state with lever and/or overload condition With alarm contact 21 Alarm contact switches change state only with overload condition Without inertia delay Blank With inertia delay F Rated Current Rated current (current trip) 0.3A, 0.5A, 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 Internal Circuit Auxiliary and Alarm Contacts Inertia Delay Pilot Light* All current ratings must be listed in amps (A). Example conversion: 300mA = 0.30A. For time delay curves, see page N-7. * Applicable to illuminated NRAR only. 1. For NRA series accessories, see page N-6. 2. For NRA series time delay curves, see page N-7. 3. For NRA series dimensions, see page N-10. 4. Not suitable for branch circuit protection. 5. UL recognized, applicable standard: UL1077, "Supplementary Protectors." Circuit Breakers N N-4 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC 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 (F) 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) 1. Percent of Rated Current = 9 10 Pulse Peak Current Protector Rated Current x 100% 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. Circuit Breakers www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-5 Circuit Breakers NRA Series Accessories Part Numbers: NRA Series Accessories Description Appearance 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. NRT For use on main terminals only. Includes M3.5 clamp screw. For dimensions see page N-10. Screw Terminal Adapter (1 pair) 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 Circuit Breakers N 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-10. N-6 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers NRA Series Internal Circuits and Terminal Arrangements: NRAS and NRAN Series Series Current Trip Series Current Trip with Auxiliary Contacts Series Current Trip with Alarm Contacts LINE LINE LINE NC NO NO NC C C LOAD LOAD LOAD Internal Circuits and Terminal Arrangements: NRAR Series Series Current Trip with Auxiliary Contacts Series Current Trip LOAD (Lead Wire A) (Lead Wire B) (Lead Wire A) (Lead Wire B) (-) (~) C C NO NC NC NO 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 as shown above. LINE LINE LINE Lead Wire LOAD LOAD (+) (~) Pilot Lights (NRAR only) Series Current Trip with Alarm Contacts Time Delay Curves (numerical equivalent) AC (50/60Hz) Curve 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 N Circuit Breakers DC Overcurrent -- Time Delay Characteristics in Seconds (at 25C) Percent of Rated Current 1. All values above are in seconds. 2. Data in this table is equivalent to information presented in following time delay curves. www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-7 Circuit Breakers NRA Series DC Time Delay Curves 1,000 1,000 AD Delay Curve MD Delay Curve at 77F (25C) 100 at 77F (25C) 100 Time in Seconds 10 Time in Seconds 10 1 0.1 1 0.1 0.01 0.01 100 125 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 100 200 300 125 400 500 600 700 800 900 1,000 Percent of Rated Current 150 AC (50/60Hz) Time Delay Curves 1,000 1,000 AA Delay Curve BA Delay Curve at 77F (25C) at 77F (25C) 100 10 Time in Seconds Time in Seconds 100 1 0.1 0.01 10 1 0.1 0.01 100 125 200 300 400 500 600 700 800 900 1,000 100 125 Percent of Rated Current 150 1,000 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 MA Delay Curve at 77F (25C) 100 N Time in Seconds Circuit Breakers 10 1 0.1 0.01 100 200 125 300 400 500 600 700 800 900 1,000 Percent of Rated Current 150 N-8 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) Curves AA, BA, MA 0.3A 9.67 9.82 0.5A 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 15A 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 100 Rated Current (A) Curves AD, MD 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 N7, 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 N -20 25 50 0 Ambient Temperature (C) 70 USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers -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. 90 N-9 Circuit Breakers NRA Series Dimensions NRAS C C NC NO NC NO LINE 30.8 50.6 42.2 OFF Tab 250 Terminal (6.4W 5 0.8t) Tab 110 Terminal 2-M3 Mounting Screw (2.8W 5 0.5t) 16.6 8.2 Approx. 60 2-M3 40 1-poley LOAD 0.2 3.3 17.5 19.1 40 49.5 53.6 NRAS1111 NRAS1111F 2-pole NRAS1121 NRAS1121F 3-pole 19.1 38.2 NRAS2111 NRAS2111F 19.1 19.1 57.3 NRAS2121 NRAS2121F NC C NC OFF NO OFF C NC OFF C NO NC NO OFF C OFF NO 6-M3 4-M3 NRAS3111 NRAS3111F NRAS3121 NRAS3121F NRAN 1-pole Tab250 Terminal (6.4 W x 0.8t) Tab110 Terminal 2-M3 Screw (2.8W x 0.5t) 2-M3 NO NC C NC NO C 40 52 42.2 31.5 OFF 16.6 8.2 Approx. 60 LINE LOAD 4.5 16.5 19.1 41 50.5 54.6 NRAN1111 NRAN1111F 2-pole 3-pole NRAR NC 19.1 19.1 57.3 www.idec.com NC C Pilot Light Lead Wire NP LOAD 9.2 17.3 40 NP LINE 56 65.5 70.5 NRAN3121 NRAN3121F NO NC 52 42.2 31.5 ON NO NRAN3111 NRAN3111F Tab250 Terminal (Pilot Light Terminal) OFF C NC C NRAN2121 NRAN2121F LOAD N-10 OFF 8.2 16.6 40 NRAS2111 NRAS2111F OFF C Circuit Breakers 19.1 38.2 NO NC OFF NO OFF C OFF NO 6-M3 4-M3 N NRAN1121 NRAN1121F LINE 56 65.5 69.6 Tab110 Terminal (2.8W x 0.5t) USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers NRA Series 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 NRAR, NRAN o4 holes 19.1 32 5.1 19.1 42.2 42.2 26.7 o16 +0.3 0 5.1 o4 holes (9.8) 19.1 19.1 1-pole 19.6 2-pole 38.7 3-pole 57.8 NR31, NR32, NR33 -- Panel Mount Flush Plate 5mm 53.5 +0.5 0 Panel Thickness 1 to 4mm 19.6 1-pole (Note 1) 2-pole 3-pole 38.7 (Note 2) 41mm 16.5 mm 57.8 (Note 3) Panel cut-out when two or more units are mounted closely (n = number of units). Note 1: 24.3n - 5 Note 2: 48.8n - 10 Note 3: 69.3n - 10 Maximum Mounting Distance A B NRAS 3.02" (77.5mm) 3.57" (91.5mm) Mounting to Panel Surface When mounted on a panel Mounting to DIN Rail When mounted on a DIN Rail 19.1mm 20.2mm NRAN 3.02" (77.5mm) N Schematics in mm 3.57" (91.5mm) Circuit Breakers Model 26mm DIN rail 9mm 75mm 2-o3.5 holes NRAR 3.38" (86.7mm) 3.93" (100.7mm) A www.idec.com B USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-11 Circuit Breakers NRA Series Accessory Dimensions NRT: Screw Terminal Adapter (for use with NRA Series) 1.For use on main terminals only. 2.Includes M3.5 clamp screw. BNDN1000 Aluminum DIN Rail Length in Inches (mm) F G H K Overall length 39.4" (1000mm) A B D C H 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) Circuit Breakers N N-12 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC 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 This is the most common circuit breaker, providing excellent overload and short circuit protection. It can also be used as an ON/OFF switch. N 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 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-29 Circuit Breakers Series Trip with Auxiliary Contact