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부품번호 | NF630 기능 |
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기능 | Yechnical Notes | ||
제조업체 | Mitsubishi Electric | ||
로고 | |||
전체 30 페이지수
ADVANCED AND EVER ADVANCING
MOULDED CASE CIRCUIT BREAKERS
TECHNICAL NOTES
www.DataSheet4U.com
98
A
2. FEATURES – Advanced MCCB Design Technol-
ogy & Performance
2.1 Arc-Extinguishing Device – ISTAC
Mitsubishi has developed an epoch-making ISTAC
technology to realize an improved current-limiting and
breaking performance within a smaller breaking space.
Introduction of ISTAC technology upgrades the cur-
rent-limiting, selective-breaking, and cascade-break-
ing performance. The maximum peak let-through cur-
rent Ip decreases to about 80% (compared with
www.DataSheet4MU.citosmubishi’s 100AF). The passing energy I2t de-
creases to about 65% (compared with MItsubishi’s
100AF). The smaller breaking space has led to an
improved function, a smaller size, and a standardiza-
tion of the breakers.
Triple forces accelerating
The triple forces generated by a newly designed cur-
rent pass and the Vapor Jet Control (VJC) insulat-
ing materials which makes up a slot-type breaking
construction accelerate the movable conductor, and
separate the contacts faster than ever before in short-
breaking.
Electromagnetic attractive force which works between
a current of the movable conductor and a current of
the fixed upper conductor.
Electromagnetic repulsive force which works between
a current of the movable conductor and a current of
the fixed lower conductor.
Pressure which works on the movable conductor by
gas generated in the slot.
The VJC suppresses the emergence of carbide prod-
ucts in breaking a current and contribute to the recov-
ery of insulation immediately thereafter.
The VJCs on the fixed and movable contacts work
together to forcefully reduce the arc spot and rapidly
contract the total arc being extinguished.
Upper,
fixed-contact
conductor
Movable contact
Pressure
3
Movable
contact VJC
Lower,
fixed-contact
conductor
Arc Fixed contact
VJC
Vapor jet control (VJC)
Vapor Jet Controllers made of insulating material are
arranged around the contacts where they control the
arc as follows:
1. The arc spot is forcibly reduced by the arrange-
ment of the insulating material.
2. The arc column is contracted.
3. Adiabatic expansion cools the arc.
4. The arc is transferred at the optimum moment to
the arc-extinguishing chamber by the arrangement
of the Vapor Jet Controllers.
Repulsive
force
21
Movable
contact
Attractive
force
Current A
Current
Current C
Upper,
fixed-contact
conductor
Current B
Lower,
fixed-contact
conductor
Arc control by slot-breaking
The VJC of the fixed contact incorporates newly de-
veloped insulation made of ceramic fiber and metal
hydroxide. The substantially improves the VJC effect.
The arc-extinguishing gas energies to improve the
capability of extinguishing the arc.
3
4페이지 3. CONSTRUCTION AND OPERATION
3.1 General
The primary components are: a switching mechanism,
an automatic tripping device (and manual trip button),
contacts, an arc-extinguishing device, terminals and
a molded case.
Arc-Extinguishing Device
Mitsubishi MCCBs feature excel-
lent arc-extinguishing perfor-
www.DataSheet4Um.acnocme by virtue of the optimum
combination of grid gap, shape,
and material.
Magnetic flux
Grid
Magnetic
force
Arc
Arc extinction
Contact
Switching Mechanism
The contacts open and close rap-
idly, regardless of the moving
speed of the handle, minimizing
contact wear and ensuring safety.
Link-mechanism
operation
Molded case
(Base)
Terminal
Trip Button (Push to Trip)
Enables tripping mechanically
from outside, for confirming the
operation of the accessory switch-
es and the manual resetting func-
tion.
Fig. 3.1 Type NF100-SP Construction
Molded case
(Cover)
Automatic tripping device
Handle
1. Trip indication
The automatically tripped condi-
tion is indicated by the handle in
the center position between ON
and OFF, the yellow (or white)
line cannot be seen in this posi-
tion.
2. Resetting
Resetting after tripping is per-
formed by first moving the han-
dle to the OFF position to en-
gage the mechanism, then re-
turning the handle to ON to re-
close the circuit.
3. Trip-Free
Even if the handle is held at
ON, the breaker will trip if an
overcurrent flows.
OFF
OFF
ON
ON
ON
OFF
Trip
Handle indication
4. Contact On Mechanism
Even in the worst case in which
welding occurs owing to an
overcurrent, the breaker will trip
and the handle will maintain to
ON, indicating the energizing
state.
6
7페이지 | |||
구 성 | 총 30 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
NF630 | Yechnical Notes | Mitsubishi Electric |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |