Circuit Breakers 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-efŢciency • Life expectancy of over 10,000 operations • UL1077 recognized “Supplementary Protectors” • VDE certiŢed to EN60934 NRAS NRAN File No. E68029 license #116381 NRAR NRAR Illuminated Rocker Rocker (neon lamp) Protection Method Electromagnetic tripping Internal Circuit Series current trip NRAS and NRAN: 1, 2, 3 Number of Poles NRAR: 1 Rated Voltage 250V AC, 50/60Hz, 65V DC 0.3A, 0.5A, 0.75A Rated Tripping Currents 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A 250V AC, 50/60Hz, 1,000A Rated Interrupting Capacity 65V DC, 1,000A Auxiliary Contact SPDT microswitch 250V AC, 5A (resistive load) 50V DC, 1A (resistive load) Alarm Contact Reference Temperature 25°C Operating Temperature –40 to +85°C (avoid freezing) Insulation Resistance 100MΩ minute (measured with 500V megger) Between main circuit terminals: 2,000V AC, 1 minute Dielectric Strength Between main circuit and auxiliary contact: 2,000V AC, 1 minute Vibration Resistance 100N (approximately 10G) (10 to 100Hz) Shock Resistance 1,000N (approximately 100G) Life Expectancy Minimum 10,000 cycles (at 6 operations per minute) Main terminal: Quick-connect receptacle 0.250" (accepts M3.5 screw terminal adapter) N Termination Auxiliary contact, alarm contact: Quick-connect receptacle 0.080" Illumination Voltage Neon: 120, 240V AC, 50/60Hz (NRAR illuminated units) Not suitable for branch circuit protection. www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-3 Specifications NRA Series 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 -31 NRAR 1 1 11 F 30A AA 1 ➁ Poles➂ Internal➃ Auxiliary and ⑤ Inertia ➅ Rated Current ➆ Time Delay ⑧ Pilot ➀ Model Circuit Alarm Contacts Delay Curve Light * Part Number Codes: NRA Series Description Part Number Code Remarks Toggle (round cutout) NRAS ➀ Model Toggle (rectangular cutout) NRAN Rocker NRAR 1-pole 1 NRAR available in 1-pole only. All multi-pole circuit breakers are simultaneous ➁ No. of Poles 2-pole 2 throw/simultaneous break. All levers are mechanically interlocked. 3-pole 3 Series current trip 1➂ Internal Circuit Without 00 ➃ Auxiliary and Auxiliary contact switches change state with lever and/or overload With auxiliary contact 11 condition Alarm Contacts With alarm contact 21 Alarm contact switches change state only with overload condition Without inertia delay Blank ⑤ Inertia Delay With inertia delay F 0.3A, 0.5A, 0.75A, 1A, All current ratings must be listed in amps (A). ➅ Rated Current Rated current (current trip) 2A, 3A, 5A, 7.5A, 10A, Example conversion: 300mA = 0.30A. 15A, 20A, 25A, 30A DC curves AD, MD ➆ Time Delay For time delay curves, see page N-7. Curve AC curves AA, BA,MA With neon light 120V AC (50/60Hz) 1 ⑧ Pilot Light* * Applicable to illuminated NRAR only. With neon light 240V AC (50/60Hz) 2 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.” N N-4 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers Circuit Breakers 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. Response to overcurrent is quite fast. Suited for protection of semiconductor circuits with BA very little overload tolerance. If overcurrents are expected to ţow, 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. Designed not to trip on 20 times the rated current (peak value) for a duration of 8ms. Suited for With Inertia Delay (F) transformer and lamp loads that draw steep inrush currents. 16,000 Inertia Delay Descriptions Pulse Peak Circuit breakers equipped with inertia delay do not respond to high inrush currents such as 14,000 Current those produced by transformer, lamp, or motor loads, but perform the speciŢed interruption Pulse on the rated overcurrents. (duration) 12,000 Width Specify inertia delay by inserting an “F” in the part number as shown in Part Number Guide 10,000 on previous page. 8,000 6,000 4,000 2,000 123456789 10 Pulse Width (ms) 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 N Multi-pole units can incorporate auxiliary and alarm contacts. Auxiliary and alarm contacts will not work with IDEC’s DIN rail adapters. www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-5 Percent of Rated Current NRA Series Circuit Breakers Accessories Part Numbers: NRA Series Accessories Description Appearance Part No. Remarks Red NR5R Colored Ş 0.62" Cap (15.8mm) Blue NR5S Color Caps (NRAS only) Panel NR5Y Yellow Colored caps Ţt onto NRAS circuit breakers for color coding circuits and White NR5H improving the appearance of the panel. For use on main terminals only. Screw Terminal Adapter NRT Includes M3.5 clamp screw. (1 pair) For dimensions see page N-10. Part Numbers: NRA Mounting Accessories No. of Description Appearance For Model Part No. Remarks Poles NRAN 1-pole NR31 NRAR Use of a ţush plate makes NRAN 2-pole NR32 snap-in mount possible for NRAN, and NRAR 2.65" Panel Mount circuit breakers (tightening (68mm) 1.89" screws not necessary). Flush Plate (48.5mm) 0.936" Multiple units can mount in (24mm) NRAN 3-pole NR33 a single panel cut-out. 2.46" (63mm) 2.26" 1.50" 0.757" (58mm) (38.5mm) Mounting (19.4mm) 1-pole NR21 Clip 1.Furnished with a hold- down spring. NRAS 2.Applicable only for series NRAN trip units up to 20 amps. DIN Rail 2-pole NR22 3.Not applicable for NRAR Plug-in Base lighted series. 4.Not for use with circuit breakers incorporating DIN Rail 3-Pole 3-pole NR23 auxiliary or alarm contacts. Hold-Down 1-Pole 2-Pole Spring NRAR 1-pole NR211 N 1-pole NUS1 NRAS 2-pole NUS2 Surface Mount NRAN Plug-in Base 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 Circuit Breakers Circuit Breakers NRA Series Internal Circuits and Terminal Arrangements: NRAS and NRAN Series Series Current Trip Series Current Trip Series Current Trip with Auxiliary Contacts with Alarm Contacts LINE LINE LINE NC NO NO NC C C LOAD LOAD LOAD Internal Circuits and Terminal Arrangements: NRAR Series Pilot Lights (NRAR only) Series Current Trip Series Current Trip Series Current Trip with Auxiliary Contacts with Alarm Contacts Lead Wire Pilot Light A B LOAD LOAD LOAD Neon White White (Lead Wire A) (120V AC) (Lead Wire A) (Lead Wire B) (+) (~) (Lead Wire B) Neon Black Black (240V AC) C C Dashed lines represent NC (–) (~)NO NRAR illuminated rocker units. Lead wires for neon NO NC pilot light as shown above. LINE LINE LINE Time Delay Curves (numerical equivalent) Overcurrent — Time Delay Characteristics in Seconds (at 25°C) Percent of Rated Current Curve 100% 125% 150% 200% 400% 600% 800% 1000% N 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 No trip 60 – 900 30 – 260 9 – 70 1.5 – 8 0.18 – 2.5 0.009 – 0.25 0.006 – 0.08 MA 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 AC (50/60Hz) DC NRA Series Circuit Breakers DC Time Delay Curves 1,000 1,000 AD Delay Curve MD Delay Curve 100 at 77˚F (25˚C) 100 at 77˚F (25˚C) 10 10 1 1 0.1 0.1 0.01 0.01 100 200 300 400 500 600 700 800 900 1,000 125 Percent of Rated Current 150 100 200 300 400 500 600 700 800 900 1,000 125 Percent of Rated Current 150 AC (50/60Hz) Time Delay Curves 1,000 1,000 AA Delay Curve BA Delay Curve 100 at 77˚F (25˚C) 100 at 77˚F (25˚C) 10 10 1 1 0.1 0.1 0.01 0.01 100 200 300 400 500 600 700 800 900 1,000 100 200 300 400 500 600 700 800 900 1,000 125 Percent of Rated Current 125 Percent of Rated Current 150 1,000 150 MA Delay Curve 100 at 77˚F (25˚C) N 10 1 0.1 0.01 100 200 300 400 500 600 700 800 900 1,000 125 Percent of Rated Current 150 N-8 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers Time in Seconds Time in Seconds Time in Seconds Time in Seconds Time in Seconds Circuit Breakers Circuit Breakers NRA Series Resistance and Impedance Characteristics Coil Data for Series Current Trip at 25˚C Rated AC Impedance Coil Resistance at 25°C DC Resistance Current (50/60Hz) 100 Curves AA, BA, Curves AD, MD MA Curves AD, MD 10 0.3A 9.67Ω 9.82Ω 0.5A 3.24Ω 3.36Ω 1 0.75A 1.45Ω 1.49Ω 1A 0.90Ω 0.92Ω 0.1 2A 0.21Ω 0.21Ω 3A 0.09Ω 0.092Ω 0.01 0.001 0.01 110 100 5A 0.036Ω 0.036Ω 0.1 Coil Resistance (Ω) 7.5A 0.017Ω 0.018Ω 10A 0.012Ω 0.012Ω 100 15A 0.0066Ω 0.0068Ω 20A 0.0048Ω 0.0048Ω Curves AA, BA, MA 10 25A 0.0043Ω 0.0043Ω 30A 0.0036Ω 0.0041Ω 1 Tolerance ±25% (up to 20A), ±50% (25A and over). 0.1 0.01 0.01 Voltage Drop Due to Resistance or Impedance 0.001 0.1 110 100 Impedance (Ω) 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. Time Delay Curve and Ambient Temperature Since NRA series circuit breakers employ an electromagnetic tripping system, Temperature Correction Curves 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 N- Curves AD, AA, BA 7, are at 25°C. Time delay curves can be corrected. (on 125% rated current) 400 200 100 80 N 60 40 –40 –20 25 50 70 90 0 Ambient Temperature (°C) www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-9 Rated Current (A) Rated Current (A) Rated Current (A) CNONC NRA Series Circuit Breakers Dimensions NRAS 1-poleý Tab 250 Terminal (6.4W 5 0.8t) 2-M3 Tab 110 Terminal 2-M3 Mounting Screw (2.8W 5 0.5t) LINE OFF LOAD 0.2 40 19.1 NRAS1111 NRAS1121 3.3 49.5 NRAS1111F NRAS1121F 17.5 53.6 2-pole 3-pole 4-M3 6-M3 OFF OFF OFF OFF OFF 19.1 19.1 19.1 NRAS2111 NRAS2121 NRAS3111 NRAS3121 38.2 57.3 NRAS2111F NRAS2121F NRAS3111F NRAS3121F NRAN 1-pole Tab250 Terminal (6.4 W × 0.8t) 2-M3 Tab110 Terminal 2-M3 Screw (2.8W × 0.5t) LINE OFF LOAD 19.1 4.5 41 NRAN1111 NRAN1121 16.5 50.5 NRAN1111F NRAN1121F 54.6 2-pole 3-pole 4-M3 6-M3 OFF OFF OFF OFF OFF N 19.1 19.1 19.1 NRAS2111 NRAN2121 NRAN3111 NRAN3121 38.2 57.3 NRAS2111F NRAN2121F NRAN3111F NRAN3121F NRAR Pilot Light Lead Wire Tab250 Terminal (Pilot Light Terminal) LOAD LOAD ON OFF LINE LINE 56 56 Tab110 Terminal 65.5 65.5 (2.8W × 0.5t) 70.5 69.6 N-10 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Approx. 60 Approx. 60 Circuit Breakers 52 50.6 42.2 52 42.2 31.5 42.2 31.5 30.8 NP CNO NC CNO NC 9.2 17.3 CNC NO 40 CNC NO 16.6 8.2 40 16.6 8.2 40 CNO NC CNO NC CNC NO CNC NO NP 8.2 16.6 CNO NC 40 CNO NC CNC NO CNC NO Circuit Breakers Circuit Breakers NRA Series Panel Cut-Outs 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°. NRA Series NRAS NRAR, NRAN ø4 holes ø4 holes ( ) 9.8 19.1 19.1 1-pole 19.6 19.1 19.1 2-pole 38.7 3-pole 57.8 NR31, NR32, NR33 — Panel Mount Flush Plate Panel Thickness 1 to 4mm 5mm 19.6 (Note 1) 1-pole 16.5 2-pole 38.7 (Note 2) mm 41mm 3-pole 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 Model A B Schematics in mm N Mounting to Panel Surface Mounting to DIN Rail NRAS 3.02" (77.5mm) 3.57" (91.5mm) When mounted on a panel When mounted on a DIN Rail 19.1mm 20.2mm 26mm NRAN 3.02" (77.5mm) 3.57" (91.5mm) DIN rail ø 2- 3.5 holes NRAR 3.38" (86.7mm) 3.93" (100.7mm) A B www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC N-11 +0.3 ø16 0 +0.5 53.5 0 26.7 42.2 42.2 9mm 5.1 32 5.1 75mm NRA Series Circuit Breakers 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) A 1.4" (35mm) F B 1.14" (29mm) C 0.78" (23mm) D 1.2" (31mm) G H A E 0.41" (10.5mm) B K D C F 0.11" (3mm) G 2" (51mm) H 0.47" (12mm) H Overall length 39.4" (1000mm) K 0.16" (4mm) N N-12 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada: (888) 317-IDEC Circuit Breakers Circuit Breakers Circuit Breakers Instructions Instructions: All Series General Applications IDEC’s circuit breakers have been developed for the protection of electrical The IDEC NRA circuit breaker series features superior overload and short-cir- circuits and small-sized electrical equipment and provide excellent protection cuit protection. Many combinations of protection mechanisms and internal against overloads and short-circuits. circuit connections enable wide applications. • Precision measuring instruments: electronic counters, projection Additionally, IDEC’s circuit breakers are designed to suit speciŢc needs. Each instruments, oscilloscopes, industrial instrumentation, and analytic series offers unique circuit protection characteristics and a choice of actuator devices styles. • Electronic communication devices: facsimile machines, computers, recorders • Industrial machinery: printers, elevators, cranes • Chemical and food industry machines: vacuum devices, wrappers, IDEC’s Circuit Breaker Features centrifuges, agitators • Machine tools: mill grinders, drills, presses •Various models are available with different internal circuits, tripping charac- • Business machines: automatic vendors, medical equipment, beauty teristics, and rated currents salon equipment, entertainment games • 1- to 3- multi-pole • Other: ofŢce equipment, air-conditioners, conveyor belts, and many more • Inertia delay • Auxiliary contacts and alarm contacts • The electromagnetic tripping system is not affected by ambient temperature • Safe trip-free mechanism How the Breaker Operates •Vibration- and impact-resistant design • When using accessories such as plug-in bases, ţush plates, and colored IDEC’s hydraulic magnetic circuit breakers operate like a solenoid coil. The caps, a variety of mounting styles is possible — such as DIN rail mount- coil unit consists of an oil-Ţlled tube with a metal core at one end and a pole ing, snap mounting into panel cut-outs, and color-coded arrangement on piece and armature at the opposite end with a spring in between. the panel When a current load passes through the coil winding, it creates a magnetic Ţeld. As long as the current load is either at or below the nominal rating of the breaker, the metal core will remain stationary. Mounting Instructions: Installation Angle Designed to be mounted on a vertical surface, the circuit breakers should be If the current load increases beyond the nominal rating, the strength of the mounted on a surface within 10° of the vertical plane. If the circuit breaker is magnetic Ţeld causes the core to move toward the pole-end of the tube. The mounted on a horizontal surface or at any angle other than the speciŢed oil viscosity regulates the core’s movement through the tube, thereby regulat- angle, its characteristics will be changed. ing the time delay. As the percentage of current load increases, the required trip time of the breaker decreases and vice versa. Multi-Pole Assemble Multi-pole types such as 2- or 3-pole should be assembled by IDEC. When the current reaches the overload rating, the metal core will meet the Because of their characteristics, 1-pole breakers cannot be com- pole piece at the opposite end of the tube. At this point, the armature is bined to produce multi-pole units. attracted to the same pole piece, tripping the breaker. In case of sudden short circuit, the magnetic Ţeld created will instantly trip the breaker. Internal Circuits Overview 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. Load N Series Trip with Auxiliary Contact Since the auxiliary contact operation is interlocked with the ON/OFF of the main contactor, Load A 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 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 Load A 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