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NDB5 Series Hydraulic Electromagnetic Circuit Breaker
Updated:August 01,2020 18:06PM

Rated working voltage (Ue): 80VDC 125VD 230/240/250VDC 400/415VAC 480/277VAC Standards: IEC 60934 UL1077 UL489A; Mechanical/Electrical endurance: 15000/10000 times.
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NDB5 Series
NDB5 Series
NDB5 Series
NDB5 Series
NDB5 Series


Description of NDB5 Series

NDB5 circuit breaker for equipment is applicable to the rated current from 0.5A to 63A, up to 150A for multiple poles in parallel. In electric systems with the rated voltage not higher than AC230/400V, AC250V, AC480/277V (50/60Hz) or DC80V, the product can be used for infrequent making and breaking as well as overload and short-circuit protection. They are widely used in the computer and peripheral equipment, industrial automation system, telecommunication equipment, universal power supply system, UPS equipment, locomotive, marine electrical system, aerospace, elevator control system and mobile power supply equipment.



Features of NDB5 Series

  • Which is little affected by the ambient temperature change. Therefore, do not consider the reduced capacity due to high temperature.
  • Cooling time is not required, which can be re-closed immediately after the fault current disappears.
  • The "reverse time limit" facilitates the overload protection.


Technology data

Technology data of NDB5 Series

Tripping times in second(tested under cold status)

Curve\Current 1.05In 1.3In 2In 6In 10In
Z2/J2 No trip 9-240 2-12 0.004-0.03 0.0035-0.018
Z4 No trip 15-240 4-20 0.01-1 0.0035-0.1
J4 No trip 20-360 6-40 0.01-1.8 0.0035-0.1
Z6/J6 No trip 60-1200 20-100 1.2-1.7 0.0055-2.2



Questions & Answers for NDB5 Series

  • What is a Hydraulic-magnetic circuit breakers?
    Hydraulic-magnetic circuit breakers. Hydraulic-magnetic breakers protect circuits by cutting power after a time delay. They do not depend on temperature as a tripping mechanism, so they often find use where ambient temperatures are high.
  • Do circuit breakers use electromagnets?
    The magnetic portion of the breaker consists of an iron core with a wire coil around it, forming an electromagnet. Load current passes through the electromagnet coils so the electromagnet responds to short-circuit currents. It may take hydraulic-magnetic breakers 10 msec or more to completely stop current flow.
  • What is a Type B circuit breaker?
    Type B devices are designed to trip at fault currents of 3-5 times rated current (In). For example a 10A device will trip at 30-50A. Type C devices are designed to trip at 5-10 times In (50-100A for a 10A device). Type D devices are designed to trip at 10-20 times In (100-200A for a 10A device).
  • Can a breaker be bad if it keeps tripping?
    The simple answer is that, yes, circuit breakers go bad, so your suspicions may be well-founded. Just like any other essential device in your home (e.g. your water heater, HVAC system, etc.), circuit breakers can quit working properly. That said, don't begin replacing your circuit breaker just yet.
  • What are the 2 types of circuit breakers?
    Standard circuit breakers come in two varieties: single-pole breakers and double-pole breakers. These are simpler breakers that monitor the cadence of electricity as it circulates an indoor space. It keeps track of electricity in electrical wiring systems, appliances and outlets.
  • What is a Type D circuit breaker?
    Type D breakers are generally found in industrial settings. According to the The Electrical Guide, Type D breakers protect devices such as transformers or welding machines — items that can tolerate higher surges of electricity than home appliances.