Circuit Breakers Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks NRBM Series Circuit Breakers NRBM Series NRBM circuit breakers are the largest in rated current (1A to 50A) among the IDEC circuit breakers series. These small sized, high-effi ciency 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: • Excellent overload and short circuit protection • Small size and high effi ciency • Life expectancy of over 10,000 operations • UL1077 recognized Supplementary Protectors • VDE Certifi ed to EN60934 License #113434 File No. E68029 General Specifi cations 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 250V AC, 50/60Hz, 1,000A Rated Interrupting Capacity 65V DC, 1,000A SPDT microswitch Auxiliary Contacts / Alarm 250V AC, 5A (resistive load) Contact 50V DC, 1 A (resistive load) Reference Temperature 25°C Ambient Operating Temperature –40 to +85°C (avoid freezing) Insulation Resistance 100MΩ (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 55Hz Shock Resistance 1,000N (approximately 100G) Life Expectancy 10,000 operations minimum (at 6 operations per minute) Main terminal: M5 stud Terminal Style Auxiliary contact/ alarm contact: Quick-connect tab 0.110” terminal 1-pole/100g Weight 2-pole/200g 3-pole/300g Not suitable for branch circuit protection. USA: 800-262-IDEC Canada: 888-317-IDEC 893 NRBM Series Circuit Breakers 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 11 F — 30A — AA j Poles k Internal l Auxiliary and m Inertia Delay n Rated Current o Time Delay Curve Circuit Alarm Contacts Part Number Codes: NRA Series Description Part Number Code Remarks 1-pole 1 All multiple pole circuit breakers are simultaneous throw/simultaneous break. All j No. of Poles 2-pole 2 levers are mechanically interlocked. 3-pole 3 k Internal Circuit Series current trip 1 Without 00 l Auxiliary and With auxiliary contact 11 Auxiliary contacts change state with lever and/or overload condition Alarm Contacts With alarm contact 21 Alarm contacts change state only with overload condition Without inertia delay Blank m Inertia Delay With inertia delay F 1A, 2A, 3A, 5A, 7.5A, 10A, 15A, n Rated Current Rated current (current trip) 20A, 25A, 30A, 40A, 50A AC curves AA, BA,MA o Time Delay Curve See page 897 for delay curves. DC curves AD, MD 1. For NRBM series time delay curves, see page 897. 2. For NRBM series dimensions, see page 899. 3. Not suitable for branch circuit protection. 4. UL recognized, applicable standard: UL1077, “Supplementary Protectors.” 894 www.idec.com Circuit Breakers Terminal Blocks Timers Relays & Sockets Display Lights Switches & Pilot Lights Circuit Breakers Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks NRBM Series Circuit Breakers Information About Circuit Breakers Time Delay Curve Descriptions Time Delay Curve NRBM Application AD, AA Common curves used in molded-case circuit breakers. Response to overcurrent is quite fast. Suited for protection of semiconductor circuits with very little overload tolerance. If overcurrents are expected to BA fl ow, 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 Pulse Peak 14,000 Current Pulse 12,000 (duration) Width 10,000 Inertia Delay Descriptions 8,000 Circuit breakers equipped with inertia delay do not respond to high inrush currents such as 6,000 those produced by transformer, lamp, or motor loads, but perform specifi ed interruption on 4,000 rated overcurrents. 2,000 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 12 34 567 8 9 10 previous page. Pulse Width (ms) Pulse Peak Current 1. Percent of Rated Current = x 100% Protector Rated Current 2. Based on sinusoidal or parabolic pulse proŢle. 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. Auxiliary and Alarm Contacts Multi-pole units with auxiliary contacts will have one set of auxiliary contacts on the right-most breaker. Multi-pole units with alarm contacts will have one set of alarm contacts on the left-most breaker. USA: 800-262-IDEC Canada: 888-317-IDEC 895 Percent of Rated Current NRBM Series Circuit Breakers Internal Circuits and Terminal Arrangements 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 Time Delay Curves (numerical equivalent) Overcurrent — Time Delay Characteristics in Seconds (at 25ºC) Percent of Rated Current Curve 100% 125% 150% 200% 400% 600% 800% 1000% 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 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 1. All values above are in seconds. 2. Data in this table is equivalent to information presented in the time delay curves shown on page 897. 896 www.idec.com Circuit Breakers Terminal Blocks Timers Relays & Sockets Display Lights Switches & Pilot Lights DC AC (50/60Hz) Circuit Breakers Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks NRBM Series Circuit Breakers AC Time Delay Curves 1000 1000 Curve AA Curve BA 100 100 (at 25ºC) (at 25ºC) 10 10 1 1 0.1 0.1 0.01 0.01 100 150 200 300 400 500 600 700 800 900 1000 100 150 200 300 400 500 600 700 800 900 1000 125 125 Current (percent load of the rated current) Current (percent load of the rated current) 1000 Curve MA 100 (at 25ºC) 10 1 0.1 0.01 100 150 200 300 400 500 600 700 800 900 1000 125 Current (percent load of the rated current) DC Time Delay Curves 1000 1000 Curve AD Curve MD 100 100 (at 25ºC) (at 25ºC) 10 10 1 1 0.1 0.1 0.01 0.01 100 150 200 100 150 200 300 400 500 600 700 800 900 1000 300 400 500 600 700 800 900 1000 125 125 Current (percent load of the rated current) Current (percent load of the rated current) USA: 800-262-IDEC Canada: 888-317-IDEC 897 Time in sec Time in sec Time in sec Time in sec Time in sec NRBM Series Circuit Breakers Resistance and Impedance Characteristics Coil Data Coil Resistance at 25ºC Rated AC Impedance DC Resistance Correction curve of resistance Current (50/60Hz) 100 between terminals (at 25ºC) Curves Curves Curves AD and MD 10 AD, MD AA, BA, MA 1A 1Ω 1.1Ω 1 2A 0.227Ω 0.245Ω 0.1 3A 0.091Ω 0.11Ω 5A 0.035Ω 0.039Ω 0.01 0.0001 0.001 0.01 0.1 1 10 100 7.5A 0.015Ω 0.018Ω Resistance (Ω) 10A 0.0088Ω 0.0124Ω Correction curve of impedance 100 15A 0.005Ω 0.0065Ω between terminals (at 25ºC) 20A 0.003Ω 0.0047Ω Curves AA, BA, and MA 10 25A 0.0023Ω 0.0032Ω 30A 0.0019Ω 0.0031Ω 1 40A 0.0018Ω 0.002Ω 0.1 50A 0.0014Ω 0.0016Ω 0.01 Tolerance ±25% (up to 20A), ±50% (25A and over). 0.001 0.01 0.1 1 10 100 Impedance (Ω) Temperature Correction Curves Voltage Drop Due to Resistance or Impedance Curves AA and AD, BA,MA and BD The internal resistance or impedance of a circuit breaker tends to be larger for a At the minimum operating current (125% current) 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. 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 Ambient Temperature (ºC) 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 897, are at 25°C. Time delay curves can be corrected. 898 www.idec.com Circuit Breakers Terminal Blocks Timers Relays & Sockets Display Lights Switches & Pilot Lights Change of time delay (%) Rated Current (A) Rated Current (A) Circuit Breakers Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks NRBM Series Circuit Breakers Dimensions: NRBM Series Recommended nut tightening 2-M3 screw torque: 2.5 N•m 19.1 19.1 2-M3 screws 10.0 Main terminal: M5 screw Tab terminal #110 (2.8W × 0.5t) NRBM 3.5 47.5 16.0 1-pole 19.1 20.5 63.5 2-pole 38.2 3-pole 57.3 Panel Cut-Outs NRBM Series 9.8 19.1 19.1 ø4 Mounting hole 1-pole 19.6 38.7 2-pole 3-pole 57.8 Drawings are not to scale. USA: 800-262-IDEC Canada: 888-317-IDEC 899 63.0 52.3 35.0 60º 52.3 26.15 49.2 20.95 35.5