ABB ConVac, Installation And Operation Instruction Manual

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1.  Overview

8

C O N V A C   V A C U U M   C O N T A C T O R  

I N S T A L L A T I O N   A N D   O P E R A T I O N   I N S T R U C T I O N

ConVac vacuum contactors are electrical switching 
devices suitable for AC power distribution systems, 
especially ideal for frequent operation.

The basic composition of contactor:

•

Three insulating covers molded in thermoplastic 

material containing the vacuum interrupter

•

Electromagnetic mechanism

•

Power control module

•

Auxiliary contacts

•

Opening and closing status indicator

•

Counter

•

Mechanical latched kit RiMe (only for mechanical 

latched type ) 

In addition to having all the components of a fixed 
version, a withdrawable contactor also contains:

•

Fuse-holder of DIN or BS type fuse according to 

customer requirements

•

Automatic tripping device associated with fuse 

of each phase

•

Truck

•

Interlock device to prevent the truck 

racking-in/out while the contactor closed

• Self-powered VT (when needed)

ConVac vacuum contactor adopts linear drive 
structure design, the movement direction is 
coaxial for operation mechanism and vacuum 
interrupter to ensure better dynamic 
characteristics and longer mechanical life, using 
three phase independent pole design to further 
improve its insulation and mechanical performance.

1.1 Electromagnetic mechanism

For electrical latched type

，

 when the closing coil 

is energized by external auxiliary power

，

the core 

may produce magnetic field and electromagnetic 
force, which makes the contactor to close and 
compresses the opening spring. Once the contactor 
reaches the closing position, the system minimizes 
the power supplied to the closing coil only to keep 
the contactor in the closing position.

When the auxiliary power supply is cut off or the 
voltage of the auxiliary power supply drops due to 
human factors (opening command) or non-human 
factors (fault on the power side), the contactor 
will release the moving contact under the action 
of the opening spring, so that the contactor will 
be opened.

For the mechanical latched type, the closing 
method is exactly the same as above. After closing, 
the contactor is kept in the closing position by a 
mechanical locking device (RiMe).When the 
contactor got the opening command, the opening 
coil is powered on, the mechanical locking device 
is unlocked, so that the contactor will open by the 
opening spring.

The power module is supplied with wide voltage, 
and its characteristics are as follows

：

Voltage

110...125 VDC/AC 
50-60 Hz
220...240 VDC/AC 
50-60 Hz

Inrush power

~1000 W

~1000 W

Holding power

~50 W

~50 W

Voltage

24 VDC
48...60 VDC
110...125 VDC/AC 50-60 Hz
220...240 VDC/AC 50-60 Hz

Inrush current

40 A
25 A
10 A
7 A

Operation time

100 ms
100 ms
100 ms
100 ms

1.2 Available type

The 7.2 kV and 12 kV ConVac vacuum contactors 
are available in both fixed and withdrawable 
version.

Electrical characteristics of mechanical latched 
device (RiMe)