Rockwell Automation 1502 Medium Voltage 400A Contactor - Series E - Manual (Page 6)

6 Rockwell Automation Publication 1502-UM052H-EN-P - June 2013
Chapter 1 Product Description
Vacuum Bottle Description Each vacuum bottle ( Figure 2 ) consists of two contacts enclosed in a ceramic
housing: an upper contact mounted to a fixed shaft, and a lower contact mounted
to a movable shaft. A stainless steel bellows ensures the vacuum integrity of the
bottle while letting the lower contact move towards and away from the fixed
contact.
Figure 2 - Vacuum Bottle Cross Section
Standard Electrically Held
Contactor Operation Each vacuum bottle ( Figure 2 ) consists of two contacts enclosed in a ceramic
housing: an upper contact mounted to a fixed shaft, and a lower contact mounted
to a movable shaft. A stainless steel bellows ensures the vacuum integrity of the
bottle while letting the lower contact move towards and away from the fixed
contact.
The standard electrically held contactor consists of three vacuum bottles. An
electro-magnet assembly and a mechanical linkage are used to close the contacts.
• When the IntelliVAC or IntelliVAC Plus control module receives a close
command, the contactor coils (two connected in series) are energized, and
the current creates an electromagnet with the coils.
• The electromagnet pulls the armature plate towards the coils’ core,
rotating the shaft and causing the actuator plate to move upwards.
• As the actuator plate moves, it pushes the insulator and movable shaft up,
closing the contacts in the vacuum bottle.
• The IntelliVAC or IntelliVAC Plus control module supplies the current
required to close the coils for 200 milliseconds. Afterward, the coil current
is reduced to a lower hold-in value.
• When the IntelliVAC or IntelliVAC Plus control module has the close
command removed, the coils are de-energized, opening the contactor.
Arc Shield
Contact Wear
Indicator Line
Fixed shaft
Ceramic
Contacts
Bellows
Bearing
Movable Shaft