DC air circuit breakers and moulded case circuit breakers
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www.terasaki.co.jp CAT REF. ’10-I73E & Air Circuit Breakers Moulded Case Circuit Breakers DC

1-1 1 General 1 Introduction ………………………………………………………………………1-2 Cases with Application and Adoption of DC Power Source ……………1-3 Selection Chart …………………………………………………………………1-4 General

1-2 In recent years, as part of the drive to reduce greenhouse gas emissions, significant attention is now being directed towards the energy produced by large-scale photovoltaic (solar), wind, and biomass energy power generation. The total power generation capacity of facilities for these new energy sources is expected to exceed that produced by nuclear energy by approximately 2030. To aid and support these new technologies, Terasaki now offer a new, broad range of dedicated DC air circuit breakers and moulded case circuit breakers. The new range of Terasaki DC circuit breakers are ideally...

1-3 1 General General DC power sources for the Uninterruptible Power Supply (UPS) market Electrical and electronic equipment used in the advanced information and communications sectors requires a highly reliable power source. Should a power failure occur, and to assist with continuity of electrical power, it is standard practice to install an Uninterruptable Power Supply (UPS). A data centre is where Internet servers and other systems for data communications, such as fixed, mobile, and IP telephones are installed. At the data centre, AC power from the main system power source is sent to the...

2-1 2 Ratings and Specifications 2 Air Circuit Breakers for DC350V-800V ………………………………………2-2 Moulded Case Circuit Breakers for DC350V-600V …………………………2-3 Moulded Case Circuit Breakers for DC750V-1000V ………………………2-5 Switch-disconnectors for DC800V-1000V …………………………………2-6 Ratings and Specifications

2-3 Moulded Case Circuit Breakers for DC350V-600V 2 Ratings and Specifications Frame size (A) Type Number of poles ¡Ratings Rated current, A Calibrated at 40°C –center pole omitted Rated insulation voltagekUilV AC Rated impulse withstand voltage kUimplkV ¡Rated breaking capacity, kA JIS C 8201-2-1 Ann.1 Ann.2 ‡G DC 600V IEC 60947-2 500V Icu/Ics(sym) ‡C‡D 350V 250V ¡External dimensions, mm a b c d Weight (' marked standard type) kg ¡Connections and Mountings Front-connected (FC) Terminal screws With extension bars Rear-connected (RC) Flat bar studs Plug-in (PM) For switchboards For...

2-4 Moulded Case Circuit Breakers for DC350V-600V Sale shortly Sale shortly Sale shortly Frame size (A) Type Number of poles ¡Ratings Rated current, A Calibrated at 40°C –center pole omitted Rated insulation voltagekUilV AC Rated impulse withstand voltage kUimplkV ¡Rated breaking capacity, kA JIS C 8201-2-1 Ann.1 Ann.2 ‡G DC 600V IEC 60947-2 500V Icu/Ics(sym) ‡C‡D 350V 250V ¡External dimensions, mm a b c d Weight (' marked standard type) kg ¡Connections and Mountings Front-connected (FC) Terminal screws With extension bars Rear-connected (RC) Flat bar studs Plug-in (PM) For switchboards For...

2-5 Moulded Case Circuit Breakers for DC750V-1000V 2 Ratings and Specifications Frame size (A) Type Number of poles ¡Ratings Rated current, A Calibrated at 40°C –center pole omitted Rated insulation voltagekUilV AC Rated impulse withstand voltage kUimplkV ¡Rated breaking capacity, kA JIS C 8201-2-1 Ann.1 Ann.2 DC 1000V IEC 60947-2 Icu/Ics(sym) ‡@‡A 750V ¡External dimensions, mm a b c d Weight (' marked standard type) kg ¡Connections and Mountings Front-connected (FC) Terminal screws With extension bars Rear-connected (RC) Flat bar studs Plug-in (PM) For switchboards For distribution boards...

2-6 Switch-disconnectors for DC800V-1000V Frame size (A) Type Number of poles ¡Ratings Rated current, A Calibrated at 40°C Rated insulation voltagekUilV AC Rated operational voltage V DC Rated short circuit making capacity, kA peak Rated short time withstand current, kA Rated impulse withstand voltage kUimplkV ¡Performance Utilization category ‡@‡A DC JIS C 8201-3 IEC 60947-3 ¡External dimensions, mm a b c d Weight (' marked standard type) kg ¡Connections and Mountings Front-connected (FC) Terminal screws With extension bars Rear-connected (RC) Flat bar studs Plug-in (PM) For switchboards...

3-4 Type Time/Current characteristic curves, Ambient Compensating Curves XS1250ND XS1600ND XS2000ND s e c o n d m i n u t e h o u r 0.006 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 1 2 4 6 10 20 40 1 2 4 6 10 20 40 1 2 3 1000 2000 1250 3000 5000 6000 8000 10000 20000 30000 Rated Current (A) Tripping Time Setting tolerance (Scale4) Setting tolerance (Scale8) Adjustable setting range of magnetic trip. Five stages within this range. Note: Magnetic trip only. Use the external over-current relay. second minute hour 0.006 0.01 0.02 0.04 0.06 0.1 0.2 0.4 0.6 1 2 4 6 10 20 40 1 2 4 6 10 20 40 1 2 3 1000...

4-2 Connection of conductors to DC circuit breakers –center pole omitted It is more difficult to interrupt DC current than AC current because DC current does not have a zero point. Therefore for high DC voltages, 3-pole or 4-pole circuit breaker main contacts are connected in series to ensure breaking performance. As illustrated below, the main power conductors for DC-use air circuit breakers, moulded case circuit breakers, and switch disconnectors shall be connected generally as shown below but also depending on the type of breaker, the number of poles, and the DC operating voltage. 2pole...