Installation - BE SURE POWER IS OFF
The nameplate ratings of the contactor must agree with the
power supply and the rating of the load. Contactor mounting
should be solid to prevent vibration. The contactor must be
mounted in a vertical plane. Before making any connections,
be certain that all leads to be handled are de-energized. With
power off, operate contactors, relays and interlocks to see
that they work freely. See that all terminals and connections
are clean and tight. For electrical connection, wire per one of
the schematics shown in Fig. 2 thru 4 depending on the
desired control.
The auxilliary contact unit is retained in a metal bracket by a
spring clip and retainer screw. The auxiliary contact is operated
by a metal operator mounted on the crossbar. To remove the
contact unit loosen the retainer screw (turn counterclockwise)
several times and slide the auxiliary contact unit out of the brack-
et cavity.
When the auxiliary contact unit is properly installed and the
contactor is fully closed, the auxiliary contact stroker can be
manually depressed 1/16 inch further. If adjustment is neces-
sary, open or close the slot in the end of the operator to obtain
the necessary 1/16 inch additional travel.
Coil Replacement
- refer to Figure 1, Tables 2 and 4.
Pickup coil: Remove all power to the contactor and the operat-
ing coils. Remove tt·,e coil leads from the pickup coil (7).
Loosen the two bolts (1) holding the arc chute (2). Gently lower
the crossbar assembly (3). Remove the old coil from the
magnet by removing the two mounting screws ( 4). Place the
new coil on the contactor and replace
Arc Chute
- refer to Figure 1, Table 2
Caution: The contactor must never be operated in a
power circuit unless the arc chute is securely bolted in
place.
The arc chute (2) provides the mechanical stop for the moving
contact assembly while maintaining the proper open gap for
the main contacts. The arc chute also contains the De-ion
®
type arc quenchers. Two front accessible bolts (1) hold the arc
chute in place. This arc chute requires no maintenance except
for periodic inspection for grid damage or ceramic liner
burn-through by fault conditions.
Range of Conductor Sizes
Contactor
Rating
300A
400A
CU/AL
Terminals
#4 AWG - 600 kcmil
(2) #2 AWG-350 kcmil
Terminals are marked as suitable for either copper
or aluminum conductors.
Power Circuit Terminals
Location (Qty.)
Arc Chute Screw (2)
Coil Mounting Screw (2)
Pick Up Coil Terminal Screw (2)
Drop Out Solenoid Terminal Screw (2)
Stationary Contact Screw (1 per pole)
Power Wire Lugs - 300A CLMOG .. .
Power Wire Lugs - 400A CLMOH .. .
Lug Mounting bolt (2 per pole)
Armature Mounting Screw (4)
Moving Contact Pivot Screw (2 per pole)
Shunt Screws (2 per pole)
Magnet Mounting Screw (2)
Solenoid Mounting Screws 0.190-32 ( 4)
Latch Bolts 0.250-20 (2)
Adjusting Screw Jam Nuts 0.250-20 (2)
Coil Clearing Auxiliary Terminals (4)
Pivot Bolt 0.312-18 (1)
Latch Pin 0.312-18 (1)
Flexlock Nut on Latch Pin
Interlock Support Mounting Screws
0.312-18 (2)
Bracket Mounting Screw 0.250-20 (1)
Striker Mounting Screw 0.190-32 (1)
Coil-Clearing Auxiliary Mounting Screws
0.190-32 (2)
Driving
Torque
(lb.-in.)
90-100
15-18
15-18
15-18
150-175
500-525
275-300
400-440
100-120
70-80
150-175
150-175
25-30
90-100
60-80
15-18
60-80
60-80
17-20
60-80
35-40
10-12
17-20
Table 2 - Recommended Driving Torque
Fig. 2 Connection Diagram for Common/Separate
Control with Momentary Pushbutton or
ON-OFF Selector Switch
Auxiliary Contact
A maximum of two auxilliary contacts can be installed on each
contactor (see Figures 5 & 6 for location and Table 5 for the auxilli-
ary units catalog numbers and their contact configurations).
3
Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092
A5E49381767A
