Instruction manual

KRB-5377
20
◯
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.