NRBM Series. Between main circuit terminals: 2,000V AC, 1 minute Between main circuit and auxiliary contact: 2,000V AC, 1 minute

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1 NRBM circuit breakers are the largest in rated current (A 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 efficiency Life expectancy of over 0,000 operations UL077 recognized Supplementary Protectors VDE Certified to EN60934 File No. E68029 License #3434 General Specifications Protection Method Electromagnetic tripping Internal Circuit Series current trip Number of Poles, 2, 3 Rated Voltage 250V AC, 50/60Hz, 65V DC Rated Tripping Currents Current trip: A, 2A, 3A, 5A, 7.5A, 0A, 5A, 20A, 25A, 30A, 40A, 50A Rated Interrupting Capacity 250V AC, 50/60Hz,,000A 65V DC,,000A Auxiliary Contacts / Alarm Contact SPDT microswitch 250V AC, 5A (resistive load) 50V DC, A (resistive load) Reference Temperature 25 C Ambient Operating Temperature 40 to +85 C (avoid freezing) Insulation Resistance 00MΩ (measured with 500V megger) Dielectric Strength Between main circuit terminals: 2,000V AC, minute Between main circuit and auxiliary contact: 2,000V AC, minute Vibration Resistance 00N (approximately 0G), 0 to 55Hz Shock Resistance,000N (approximately 00G) Life Expectancy 0,000 operations minimum (at 6 operations per minute) Terminal Style Main terminal: M5 stud Auxiliary contact/ alarm contact: Quick-connect tab 0.0 terminal -pole/00g Weight 2-pole/200g 3-pole/300g Not suitable for branch circuit protection. Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks Phone: Fax: Web: info@clrwtr.com

2 Part Numbering Guide Switches & Pilot Lights Display Lights Relays & Sockets 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 F-30A-AA NRBM F 30A AA j Poles k Internal Circuit l Auxiliary and Alarm Contacts m Inertia Delay n Rated Current o Time Delay Curve Part Number Codes: NRA Series Description Part Number Code Remarks -pole j No. of Poles 2-pole 2 All multiple pole circuit breakers are simultaneous throw/simultaneous break. All levers are mechanically interlocked. 3-pole 3 k Internal Circuit Series current trip Without 00 l Auxiliary and Alarm Contacts With auxiliary contact Auxiliary contacts change state with lever and/or overload condition With alarm contact 2 Alarm contacts change state only with overload condition m Inertia Delay Without inertia delay Blank With inertia delay F n Rated Current Rated current (current trip) A, 2A, 3A, 5A, 7.5A, 0A, 5A, 20A, 25A, 30A, 40A, 50A o Time Delay Curve AC curves AA, BA,MA DC curves AD, MD See page 897 for delay curves.. For NRBM series time delay curves, see page For NRBM series dimensions, see page Not suitable for branch circuit protection. 4. UL recognized, applicable standard: UL077, Supplementary Protectors. Terminal Blocks Timers Phone: Fax: Web: info@clrwtr.com

3 Information About Time Delay Curve Descriptions Time Delay Curve AD, AA BA MD, MA With Inertia Delay (F) Inertia Delay Descriptions Common curves used in molded-case circuit breakers. NRBM Application Response to overcurrent is quite fast. Suited for protection of semiconductor circuits with very little overload tolerance. If overcurrents are expected to fl ow, fuses may be required according to the circuit characteristics. 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 transformer and lamp loads that draw steep inrush currents. 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 specifi ed interruption on 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. Multi-Pole Multi-pole types such as 2- or 3-pole should be assembled by IDEC. Notes 6,000 4,000 2,000 0,000 Because of their characteristics, -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 Percent of Rated Current 8,000 6,000 4,000 2,000 Pulse Width Pulse Peak Current (duration) Pulse Width (ms). Percent of Rated Current = Pulse Peak Current x 00% Protector Rated Current 2. Based on sinusoidal or parabolic pulse profile. 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. Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks Phone: Fax: Web: info@clrwtr.com

4 Internal Circuits and Terminal Arrangements Switches & Pilot Lights Series Current Trip LINE Series Current Trip with Auxiliary Contacts LINE NC NO Series Current Trip with Alarm Contacts LINE NO NC Display Lights C C LOAD LOAD LOAD Relays & Sockets Time Delay Curves (numerical equivalent) Overcurrent Time Delay Characteristics in Seconds Percent of Rated Current Curve 00% 25% 50% 200% 400% 600% 800% 000% Timers AC (50/60Hz) DC Terminal Blocks AA No trip BA No trip MA No trip AD No trip MD No trip 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. Phone: Fax: Web: info@clrwtr.com

5 AC Time Delay Curves Curve AA Curve BA Curve MA Curve AD DC Time Delay Curves Curve MD Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks Phone: Fax: Web: info@clrwtr.com

6 Resistance and Impedance Characteristics Switches & Pilot Lights Coil Data Rated Current DC Resistance Curves AD, MD AC Impedance (50/60Hz) Curves AA, BA, MA A Ω.Ω 2A 0.227Ω 0.245Ω 3A 0.09Ω 0.Ω Coil Resistance at 25ºC Rated Current (A) Correction curve of resistance between terminals Curves AD and MD Display Lights 5A 0.035Ω 0.039Ω 7.5A 0.05Ω 0.08Ω 0A Ω 0.024Ω 5A 0.005Ω Ω 20A 0.003Ω Ω 25A Ω Ω 30A 0.009Ω 0.003Ω 40A 0.008Ω 0.002Ω 50A 0.004Ω 0.006Ω Rated Current (A) Resistance (Ω) Correction curve of impedance between terminals Curves AA, BA, and MA Relays & Sockets Timers Tolerance ±25% (up to 20A), ±50% (25A and over). 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 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 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 Temperature Correction Curves Terminal Blocks Change of time delay (%) Impedance (Ω) Ambient Temperature (ºC) Curves AA and AD, BA,MA and BD At the minimum operating current (25% current) Phone: Fax: Web: info@clrwtr.com

7 Dimensions: NRBM pole 2-pole 3-pole Drawings are not to scale. 2-M3 screw º M3 screws 0.0 Main terminal: M5 screw pole 2-pole 3-pole Recommended nut tightening torque: 2.5 N m 49.2 Tab terminal #0 (2.8W 0.5t) Panel Cut-Outs ø4 Mounting hole Switches & Pilot Lights Display Lights Relays & Sockets Timers Terminal Blocks Phone: Fax: Web: info@clrwtr.com