Circuit Breakers NRBM 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, continued Selection Guide: NRBM and NRC Series Series Model Page NRBM NRC N-12 N-19 Lever Slide, lever Appearance Actuator Style 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 Time Delay Curves Optional (for resistance to high inrushes) -- 2 types for DC; 3 types for AC 2 types for DC; 2 types for AC Rated Voltage Rated Tripping Currents Rated Interruption Capacity Approvals 250V AC, 50/60Hz, 65V DC 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 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) UL, CSA UL, CSA 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. N UL Recognized File No. E68029 www.idec.com CSA Certified File No. LR47985 USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-3 Circuit Breakers NRBM Series NRBM Series NRBM circuit breakers are the largest in rated current (1A to 50A) among the IDEC circuit breakers series. These small sized, highefficiency breakers offer a variety of protection characteristics that can be widely employed for semiconductors, relay circuits, heater circuits, transformers, and solenoids. Key features of the NRBM series include: * Available with different internal circuits * Excellent overload and short circuit protection * Small size and high efficiency * Life expectancy of over 10,000 operations * UL1077 recognized "Supplementary Protectors" General Specifications UL Recognized File No. E68029 N Protection Method Electromagnetic tripping Internal Circuit Series current trip Number of Poles 1, 2, 3 Rated Voltage 250V AC, 50/60Hz, 65V DC Rated Tripping Currents Current trip: 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, 40A, 50A Rated Interrupting Capacity 250V AC, 50/60Hz, 1,000A 65V DC, 1,000A Auxiliary Contacts Alarm Contact SPDT microswitch 250V AC, 5A (resistive load) 50V DC, 1 A (resistive load) Reference Temperature 25C Ambient Operating Temperature -40 to +85C (avoid freezing) Insulation Resistance 100M minutes (measured with 500V megger) Dielectric Strength Between main circuit terminals: 2,000V AC, 1 minute Between main circuit and auxiliary contact: 2,000V AC, 1 minute Vibration Resistance 100N (approximately 10G), 10 to 55Hz Shock Resistance 1,000N (approximately 100G) Life Expectancy 10,000 operations minimum (at 6 operations per minute) Terminal Style Main terminal: M5 stud Auxiliary contact/ alarm contact: Quick-connect tab 0.110" terminal Weight 1-pole/100g 2-pole/200g 3-pole/300g CSA Certified File No. LR47985 1. Not suitable for branch circuit protection. N-12 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRBM Series Part Numbering Guide NRBM series part numbers are composed of 6 part number codes. When ordering an NRBM series part, select one code from each category. Example: NRBM 1 1 11 F-30A-AA NRBM 1 1 Poles 11 F Internal Auxiliary and Inertia Circuit Alarm Contacts Part Number Codes: NRBM Series Description No. of Poles Internal Circuit Auxiliary and Alarm Contacts 30A Rated Current 1 2-pole 2 3-pole 3 Series current trip 1 Without 00 With auxiliary contact 11 Time Delay Delay Part Number Code 1-pole AA Remarks All multiple circuit breakers are simultaneous throw/simultaneous break. All levers are mechanically interlocked. Alarm contacts are available only on series trip units. With alarm contact 21 Without inertia delay Blank With inertia delay F Rated Current Rated current (series current trip) 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, 40A, 50A All current ratings must be listed in amps (A). Example conversions: 50mA = 0.05A, 300mA = 0.30A. Leave blank for switch only units. Time Delay Curve DC curves AD, MD AC curves AA, BA, MA See page N-16 for delay curves. Leave blank for switch only units. Inertia Delay Inertia delay is available with curves AD, MD, AA, BA, and MA. 1. For NRBM series accessories, see page N-15. 2. For NRBM series time delay curves, see page N-16. 3. For NRBM series dimensions, see page N-25. 4. Not suitable for branch circuit protection. 5. UL recognized, applicable standard: UL1077, "Supplementary Protectors." 6. Switch only types are not CSA certified. N www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-13 Circuit Breakers NRBM Series Information About Circuit Breakers Time Delay Curve Descriptions Time Delay Curve NRBM 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. Inertia delay is available with time delay curves AD, MD, AA, BA, and MA. 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 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. All multi-pole units are simultaneous break/simultaneous make, with levers mechanically interlocked. N Auxiliary and Alarm Contacts Multi-pole units with auxiliary contacts will have one set of auxiliary contacts on the rightmost breaker. Multi-pole units with alarm contacts will have one set of alarm contacts on the left-most breaker. N-14 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRBM Series Accessories Part Numbers: NRBM Mounting Accessories Description Appearance Part No. Terminal Socket MS-1C Remarks For connection with auxiliary or alarm contact terminals. For dimensions of NRBM series accessories, see page N-25. Internal Circuits and Terminal Arrangements Series Current Trip LINE LOAD Series Current Trip with Auxiliary Contacts Series Current Trip with Alarm Contacts LINE LINE LOAD NC NO NO NC C C LOAD N www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-15 Circuit Breakers NRBM Series Time Delay Curves (numerical equivalent) Overcurrent -- Time Delay Characteristics (at 25) 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 0.14 - 1.4 0.008 - 0.7 0.005 - 0.35 MD No trip 35 - 400 20 - 180 8 - 60 1.6 - 10 0.6 - 4.5 0.01 - 2 0.007 - 0.5 AA No trip 15 - 120 8 - 45 3 - 15 0.48 - 2.5 0.06 - 0.8 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 70 - 900 30 - 260 10 - 70 1.8 - 11 0.5 - 4 0.009 - 1.1 0.006 - 0.2 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 at 77F (25C) 100 MD Delay Curve at 77F (25C) 100 Time in Seconds Time in Seconds 10 1 0.1 10 1 0.1 0.01 0.01 100 125 200 300 400 500 600 700 Percent of Rated Current 800 900 1,000 100 125 150 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current N N-16 www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC Circuit Breakers NRBM Series AC (50/60Hz) Time Delay Curves: NRBM Series 1,000 1,000 AA Delay Curve at 77F (25C) 100 10 Time in Seconds Time in Seconds BA Delay Curve at 77F (25C) 100 1 0.1 0.01 10 1 0.1 0.01 100 125 150 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current 100 125 150 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current 1,000 MA Delay Curve at 77F (25C) Time in Seconds 100 10 1 0.1 0.01 100 125 150 200 300 400 500 600 700 800 900 1,000 Percent of Rated Current N www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-17 Circuit Breakers NRBM Series Resistance and Impedance Characteristics Coil Data for series Current Trip at 25C Rated AC Impedance DC Resistance Current (50/60Hz) 0.05A 382 430 0.10A 85.4 110 0.25A 12.6 16 0.03A 9.2 12 0.50A 3.76 4.3 0.75A 1.47 1.75 1A 1 1.1 2A 0.227 0.245 3A 0.091 0.11 5A 0.035 0.039 7.5A 0.015 0.018 10A 0.0088 0.0124 15A 0.005 0.0065 20A 0.003 0.0047 25A 0.0023 0.0032 30A 0.0019 0.0031 40A 0.0018 0.002 50A 0.0014 0.0016 100 Rated Current (A) Curves AA, BA, MA Curves AD, BD, CD, MD, ED 10 1 0.1 0.01 0.001 0.01 1 0.1 Coil Resistance () 10 100 100 Rated Current (A) Curves AD, MD Coil Resistance at 25C Curves AA, BA, CA, MA, EA 10 1 0.1 0.01 0.001 0.01 1 0.1 Impedance () 10 100 Voltage Drop Due to Coil 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 of 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. N Time Delay Curve and Ambient Temperature Since NRBM 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 N16, are at 25C. Time delay curves can be corrected. N-18 www.idec.com Rated Current (A) Tolerance 25% (up to 20A), 50% (25A and over) Curves AD, AA, BA (on 125% rated current) 400 200 100 80 60 40 -40 -20 25 50 0 Ambient Temperature (C) 70 90 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 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, continued All drawings are not to scale unless scale is indicated. NRBM Series NRBM 0.745" (19.1mm) 1.38" (35.5mm) 2.04" (52.3mm) 0.33" (8.4mm) 1-Pole: 0.764" (19.6mm) 2-Pole: 1.51" (38.7mm) 3-Pole: 2.25" (57.8mm) NRC Series Surface Mounting Hole Layout 1-Pole Surface Mounting Hole Layout 2-Pole .472" (12mm) 2-M4 Holes (4.5mm) 2.11" (54mm) 2-M4 Holes (4.5mm) 2.11" (54mm) 1.45" (37mm) N Scale: Full Size www.idec.com USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC N-29