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AC contactor
Instructions
WARNING:
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
Limited protection against contact with live parts
Degree of protection IP 00 to IEC 60529
!
Safe from finger touch to DIN VDE 0106, Part 100
Commissioning and maintenance by qualified personnel only.
Follow the operating instructions.
Installation
For dimension drawings (dimensions in mm) see
> Fig. I with screw terminals, for a.c. operation (Ia), for d.c. operation (Ib)
> Fig. II with tab connectors, for a.c. operation (IIa), for d.c. operation (IIb)
* Minimum clearances from earthed parts
Snap onto 35 mm standard mounting rail to DIN EN 50 022 or fix on a plain
surface with two M4 screws. Always use plain washers and spring washers.
Cover the contactors during installation if foreign particles, such as swarf, can
fall onto them. Install contactors in a housing if they are exposed to dirt, dust
or aggressive atmospheres.
For permissible mounting positions see Fig. III.
Connection
The terminal screws can be tightened with a power screwdriver.
Screwdriver blade width: 5 to 6 mm
Tighten all terminal screws even if not used.
Permissible cross>sections for main conductor :
one terminal
connected
Solid [mm
2
]
1
to 16
Finely stranded [mm
2
],
2.5 to 16
without end sleeve
2
Finely stranded [mm
],
1
to 16
with end sleeve
2
Stranded [mm
]
2.5 to 25
AWG wires,
14 to 3
solid and stranded
Terminal pin [mm
2
] in
1
to 6
accordance with
DIN 46231
Stripped length
Tightening torque
2
AND BURNS.
both terminals
connected
1
to 16
max. 16
max. 16
1.5 to 16
max. 10
max. 16
1
to 16
max. 10
max. 16
1.5 to 25
max. 10
max. 25
16 to 3
max. 6
max. 3
1
to 6
max. 6
max. 6
10 mm
.
2.5 to 3.0 Nm/22 to 26.5 lb
in
DIN VDE 0660, IEC 60947
Order No.: 3ZX1012>0TF02>1BA1
Permissible cross>sections for auxiliary conductor:
Solid
Finely stranded,
with end sleeve
Terminal pin,
in accordance with DIN 46231
Push>on receptacle B2.8
AWG wires,
solid and stranded
Stripped length
Tightening torque
Use 75 ∞C copper wire only.
For circuit diagram and position of connection terminals see Fig. IV.
For circuit diagram (NEMA) see Fig. A
Operation
Observe operating voltage (see rating plate of magnet coil).
The operating state of the contactor is shown at the position indicator;
see Fig. V .
When the system voltage is applied and the load is connected,
do not operate the contactor by pressing down the position
!
indicator.
After a short circuit the main contacts and the arc chute must be
checked.
Maintenance
The following components can be replaced: Main contacts, arc chute,
magnet coil, auxiliary contact blocks. For Order Nos. see Catalog NSK.
Only use of original spare parts ensures the operational safety of the
contactors.
Cleaning
Remove dust by suction.
Auxiliary contact block
For replacement see Fig. VI.
Arc chute and main contacts
Remove arc chute (Fig. VII/1, 2). Check main contacts (Fig. VII/3). If
necessary separate slightly welded contacts with a screwdriver.
Dark or rough contacts can still function. Do not refinish or grease
them. If the contact facings are eroded so that the carrier material
becomes visible the contacts must be replaced.
For replacement of contacts see Fig. VII/4, 5, 6.
It is not necessary to disconnect the main conductors.
Check the arc chute and replace it if necessary.
Put into operation only with the arc chute fitted (Fig. VII/7, 8).
Magnet coil
For coil replacement see Fig. VIII.
> Fig. VIIIa a.c. coil
> Fig. VIIIb d.c. coil
Ensure that the pole faces of the magnet coil are clean. Do not use
grease solvents or sharp objects for cleaning.
3TF44, 3TF45
2
2¥ 0.5 to 1 mm
2
2¥ 1 to 2.5 mm
2
2¥ 0.5 to 1 mm
2
2¥ 0.75 to 2.5 mm
2
2¥ 1 to 1.5 mm
2
2¥ 0.3 to 1.5 mm
2¥ 18 to 12
10 mm
.
0.8 to 1.4 Nm/7 to12 lb
in
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