50 Hz: G625 - G690 - G750XW/XF
OPERATION & MAINTENANCE MANUAL
89
60 Hz: G655 - G750 - G800 - G850XW/XF
1
ACB
Consists of breaker body (3) and draw-out cradle (2).
2
Draw-out cradle
Comes with main circuit terminals (48), control circuit terminals (38), auxiliary
switches (41), and position switches (37).
3
Breaker body
Contains the ON-OFF mechanism, the closing coil,the tripping device, and
overcurrent release (19).
4
OFF button
Push to open the ACB.
5
ON button
Push to close the ACB.
6
ON-OFF indicator
Shows “OFF” when the ACB is open and “ON” when it is closed.
7
Charge indicator
Shows “CHARGED” when the closing springs are charged and
“DISCHARGED” when it is released.
8
Charging handle
Pump to charge the closing springs.
9
Position indicator
Indicates the present breaker body position: CONN., TEST, or ISOLATED.
10
Grip
Hold to draw out the breaker body.
11
Draw-out handle insertion
hole
Insert the draw-out handle into this hole to move the breaker body.
12
Release button
Push to move the breaker body from the TEST position.
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.)
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.)
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.
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.
17
OCR cover
Padlocking this plate prevents settings of overcurrent release ?18 to be
inadvertently changed. (Padlocks are not supplied. Use padlocks with a 6 mm-
diameter shackle.)
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.
19
Front cover
A plastic cover of the breaker body front panel.
20
Rating nameplate
Indicates the type, applicable standards and rated breaking capacity of the
ACB.
22
Specification nameplate
Indicates the number of poles, operation method, accessories, and serial
number of the ACB.
23
Breaker body roller
Allows breaker body (3) to be moved on draw-out rail (31).
24
Main circuit contact
Closes when the breaker body is in the CONN. position.
25
Control circuit contact
Closes when the breaker body is in the CONN. or TEST position.
26
Arc chamber
Extinguishes the arc that occurs in the breaking operation. Two arc chambers
are fitted per pole.
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 (18).
28
Mold cover
A plastic cover of the breaker body side face.
29
Mold base
A plastic cover of the breaker body rear face.
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.
