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Contactors
Operating Instructions
Read and understand these instructions before installing,
operating, or maintaining the equipment.
DANGER
!
Hazardous voltage.
Will cause death or serious injury.
Turn off and lock out all power supplying this device before
working on this device.
Reliable functioning of the equipment is only ensured with
certified components.
Contactors for DC operation
(1)
Rated operating current I
(2)
Max. motor rated power (AC3)
For actuating voltage see magnet coil,
operating range 0.8 to1.1 x U
c .
(3) Maximum back-up fuses for contactor withtout overload relay;
LVHRC fuses, operational class gL/gT (gI/gII in accordance with IEC
60269).
(4) Max. device fuses (LVHRC, operational class aM) for contactor with
overload relay.
LVHRC back-up fuses, operational class gL/gT (gI/gII in accordance with
IEC 60269) for contactor with overload relay, see information on relay. Do
not exceed value II according to table (3)!
I No welding of contact pieces
II Light welding of the contact pieces which can be easily broken open
without further damage to the contacts.
Motor protection by overload relay (5). In the case of contactor for push-
button control, use relay without reclosing lockout, in the case of contactor
for maintained-contact operation, use relay with reclosing lockout.
Observe information on relay! Set relay scale to rated motor current.
Mounting
Screw mounting on level, vertical mounting surface. If there is danger of
contamination, high levels of dust or an aggressive atmosphere, install the
contactor in an enclosure.
(6) Permissible installation position - coil connection at top
Connection cross-sections for devices without motor protection (for
design with motor protection see corresponding overload relay operating
instructions).
(7) Main conductor: solid with cable lug
(8) Main conductor with busbars
(9) Tightening torque for main conductor
(10) Auxiliary conductor, solid
(11) Auxiliary conductor, flexible with ferrule
(12) Tightening torque for solid and flexible aux. conductors
(13) Protective conductor with cable lug
(14) Tightening torque for protective conductor
(15) Connecting the main conductors
Terminal screws (enclosed separately)
The spring washer (a) is necessary for securing the screws. The toothed
lock washer (b) only serves to faciliate installation and prevents the screw
from turning. Thus it is not necessary to counterhold the screw head.
The toothed lock washer does not replace the securing effect of the spring
washer.
2
/ AC1 (at 55 °C)
e
Order No.: 3ZX1012-0TB52-1BA1
Maintenance
Remove dust deposits (suction extraction!).
Dark colored, rough contact pieces are reliable in operation; do not rework
them or grease them! Replace the contact pieces
when the contact surfaces have eroded to such an extent that the material
of the carrier becomes partly visible.
If there are varying degrees of erosion it is permissible to only replace indi-
vidual contact pieces. After a short circuit in the system, check the main
contact pieces and, if necessary, separate welded contact pieces using a
screwdriver. Replace damaged arc chutes!
Replacing the main contact pieces
Movable contact pieces: Lift the contact pieces on one side and push
them out with the leaf springs. Push in a new contact piece with an inser-
ted leaf spring until the jumper holder engages in the center of the leaf
spring. Make sure that it can move freely in closing direction.
Fixed contact pieces: Undo the retaining screw with a 4 mm hexagon
screwdriver, replace the contact piece with retaining screw, and screw the
new contact piece tight.
(16) Tightening torque
Replacing the auxiliary switch:
There are 2 auxiliary switches on the contactor each with 1 NO + 1 NC. If
necessary, replace the complete auxiliary switch block.
Tightening torque: 0,8 – 1,2 Nm.
Replacing the arc chute:
Disconnect the quick mounting:
Push in the 2 bolts with a screwdriver and turn them 90°. The arc chute
can be removed.
Fix:
Mount the arc chute; push the 2 bolts right in and turn them 90°, making
sure that the bolts engage.
(17) Replacing the coil
Undo the retaining screws (1) of the base plate (7). Lift the contactor base
(2) including the arc chute. Undo the screws (4). Lift off the pole sheets (5)
and coil (3) from the coil cores (6) and the base plate (7), replace coil (3).
Perform assembly in the reverse sequence.
Tightening torque for all screws:
3TB52 17-0B, 3TB54 17-0B:
3TB56 17-0B
Ensure that the pole faces are clean!
Spare parts
(18) Main contacts
(19) Arc chute
(20) Auxiliary switch block left, 1 NO + 1 NC
(21) Auxiliary switch block right, 1 NO + 1 NC
Circuit diagrams
Terminal desgination according to EN 50012
(22) DC operation with aux. switch 2 NO + 2 NC
(23) Pushbutton control
(24) Maintained-contact operation
(25) Position of the terminals
(26) Dimensions (in mm)
1) Coil connection
2) Auxiliary switch connection
3TB52 17-0B
3TB54 17-0B
3TB56 17-0B
U
1000 Vk
i
VDE 0660 / IEC 60947
English
2.7 Nm
4.5 Nm
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