Brochure

23
5/98
© 1998 Square D All Rights Reserved
General Information
Class 8502 Type W non-reversing vacuum
contactors are a new addition to the Square D line
of contactors. These contactors are used to switch
capacitors, transformers and electric motors
where overload protection is separately provided.
Type W vacuum contactors are designed for
operation at 600 Volts, 50/60 Hertz.
By design, these contactors are well suited to
heavy-duty applications in harsh environments.
The power contacts are sealed in ceramic tubes,
called vacuum interrupters or vacuum bottles,
where the air has been evacuated. Arc quenchers
are not required because any arc formed between
opening contacts is not sustained due to the
presence of the vacuum. The arc is extinguished
when the current crosses zero after the contacts
are opened, therefore the arc typically does not
survive more than one half cycle. There is one
vacuum interrupter or bottle per pole, therefore a
three pole contactor has three vacuum
interrupters or bottles. The power contacts are not
affected by ambient conditions or contamination.
This provides for long life and reliable operation in
harsh applications.
Altitude
The vacuum contactor is designed to tolerate
normal barometric pressure variances up to 6600
feet above sea level. If the contactor is to be used
above 6600 feet above sea level, please consult
the factory.
Termination Means
The Size 4 vacuum contactor is supplied with line
and load side lugs
t. The Size 5 and 6 vacuum
contactors are supplied without line and load side
lugs. Class 9999 Type LUW5 and LUW6 lug kits
are available for the Size 5 and 6 contactors.
These kits include six lugs and the necessary
mounting hardware.
Auxiliary Contacts
An auxiliary contact block, Class 9999 Type
WX11, with one normally-open contact and
normally-closed contact is used with the Size 4, 5
and 6 vacuum contactors.
Auxiliary Contact Units
Auxiliary contact units may be added in the field.
the table below shows the maximum number of
units that may be added to a given size contactor
(in addition to the coil auxiliary contact).
Electrical Ratings
Characteristic Size 4 Size 5 Size 6
Maximum Motor HP at:
200 V 40 75 150
230 V 50 100 200
380 V 75 150 300
460 V 100 200 400
575 V 100 200 400
3 Phase Capacitor Switching – KVAR
230 V 40 80 160
460 V 80 160 320
575 V 100 200 400
Transformer Switching – KVA 3 Phase, 3-Pole
240 V 23 47 94
480 V 47 94 188
600 V 59 117 234
Coil Data
Inrush VA 300 600 1450
Sealed VA 30 20 32
Sealed Watts 6 20 30
Pick-up Volts 70% of rated coil voltage
Drop-out Volts 50% of rated coil voltage
Pick-up Time (ms) 18-22 24-32 24-32
Drop-out Time (ms) 90-120 96-100 96-100
Additional Electrical Characteristics
Number of Poles 3 3 3
Max. Voltage Rating 600 600 600
Enclosed Ampere Rating 135 270 540
Max. Closing Current 1600 3000 6000
Max. Interrupting Current 1600 3000 6000
Short Time Current (RMS):
1 second 2400 4500 9000
2 seconds 1600 3000 6000
Dielectric Strength, volts 5375 5375 5375
Max. Allowable Interrupting 1200/hr 1200/hr 1200/hr
Impulse Voltage, VA (1 x 40ms) 15000 15000 15000
Class 8502
Size 4 3
Size 5 4
Size 6 4
Terminals
Size
Power Terminals
Wire Sizeq
Min. – Max.
Control Terminals
Wire Sizeq
Min. – Max.
4 #12-4/0 #16-12
5c One #0-500 kcmil per phase #16-12
6c Two #0-500 kcmil per phase #16-12
c Power terminal lugs are not supplied on Size 5 and 6 contactors.
Values in table reflect those for the Size 5 and 6 lug kits, Class 9999
Type LUW5 and LUW6 respectively.
q Solid or stranded copper wire.
Full Voltage Contactors — NEMA
Application Data
Class 8502 Type WF
Vacuum Contactor
LR75167, 75168
Class 3211-04
File E78351
CCN NLDX2