KRB-5404
21
◯
1
ACB
Consists of breaker body
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3
and draw-out cradle
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2
.
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2
Draw-out cradle
Comes with main circuit terminals
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48
, control circuit terminals
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38
, auxiliary switches
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41
,
and position switches
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37
.
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3
Breaker body
Contains the ON-OFF mechanism, the closing coil
，
the tripping device, and overcurrent
release
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19
.
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4
OFF button
Push to open the ACB.
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5
ON button
Push to close the ACB.
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6
ON-OFF indicator
Shows “OFF” when the ACB is open and “ON” when it is closed.
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7
Charge indicator
Shows “CHARGED” when the closing springs are charged and “DISCHARGED” when it
is released.
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8
Charging handle
Pump to charge the closing springs.
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9
Position indicator
Indicates the present breaker body position: CONN., TEST, or ISOLATED.
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10
Grip
Hold to draw out the breaker body.
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11
Draw-out handle
insertion hole
Insert the draw-out handle into this hole to move the breaker body.
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12
Release button
Push to move the breaker body from the TEST position.
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13
Position padlock
lever (optional)
Accommodates up to three padlocks to lock the breaker body in the CONN., TEST or
ISOLATED position. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter
shackle.)
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14
Lock-in-OFF plate
(optional)
Padlocking this plate allows the ACB to be locked in the open (OFF) state. (Padlocks are
not supplied. Use padlocks with a 6 mm-diameter shackle.)
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15
ON-OFF button cover
Provides protection against inadvertent button operation and can be padlocked. (Padlocks
are not supplied. Use padlocks with a 6 mm-diameter shackle.) Up to three padlocks can be
installed.
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16
ON-OFF cycle
counter (optional)
Reads the number of ON-OFF cycles. It counts a series of operations from close to open as
one cycle.
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17
OCR cover
Padlocking this plate prevents settings of overcurrent release
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18
to be inadvertently
changed. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter shackle.)
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18
Overcurrent release
(OCR)
This protective device is supplied power via the power CT installed in the ACB main
circuit. When the current sensor detects an overcurrent in the main circuit, the OCR
instructs the magnet hold trigger (MHT) to trip open the ACB.
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19
Front cover
A plastic cover of the breaker body front panel.
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20
Rating nameplate
Indicates the type, applicable standards and rated breaking capacity of the ACB.
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22
Specification
nameplate
Indicates the number of poles, operation method, accessories, and serial number of the
ACB.
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23
Breaker body roller
Allows breaker body
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3
to be moved on draw-out rail
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31
.
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24
Main circuit contact
Closes when the breaker body is in the CONN. position.
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25
Control circuit
contact
Closes when the breaker body is in the CONN. or TEST position.
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26
Arc chamber
Extinguishes the arc that occurs in the breaking operation. Two arc chambers are fitted per
pole. See 6-2-2. "Arc chambers".
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27
Current sensor
Converts the current in the main circuit into a voltage signal in proportion to the magnitude
of the current and sends the signal to overcurrent release
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18
.
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28
Mold cover
A plastic cover of the breaker body side face.
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29
Mold base
A plastic cover of the breaker body rear face.
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30
Breaker fixing bolt
(red) (optional)
Allows the breaker body to be locked in the CONN. position even if the ACB is subject to
strong vibrations. Standard equipped on ACBs that conform to ship classification society
rules.
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31
Draw-out rail
Use to draw out the breaker body from the draw-out cradle.
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32
Draw-out rail end
Refer to chapter 1 “Operation Precautions”.
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33
Hook pin
Refer to chapter 1 “Operation Precautions”.
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34
Body stopper
Prevents the breaker body from falling when the body is drawn out from the draw-out
cradle.
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35
Body stopper shaft
Refer to chapter 1 “Operation Precautions”.
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36
Rail stopper (red)
Allows the draw-out rail to be locked in the drawn-out or retracted state.
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37
Position switches
(optional)
Indicate the present breaker body position: CONN., TEST, ISOLATED or INSERTED. The
position switches are available in 2C or 4C configuration. Connections to the position
switches are made through M4 screws.
