Product Description

Schneider Electric MotorSeT Load Break Interrupter Switches are used in the control and switching of motor control systems having nominal AC voltage ratings from 2.4–7.2 kV. They are capable of switching 400 A. Indoor air interrupter switch ratings lists the applicable limits and conditions of switching for this equipment. When used in conjunction with fuses, they will help supply overload, short circuit, and disconnect services.

These MotorSeT switches can be used as follows:

A primary disconnect for a medium voltage (MV) motor control center (MCC)
A primary disconnect for larger motor soft starters
A primary disconnect on transformers and isolation within an MCC
The fuse protection and isolation of single-circuit systems within an MCC
The fuse protection and isolation of multi-circuit systems

Layout and Configurations

The equipment entry and exit locations can be configured several ways to meet various requirements for field installation. The configuration is determined when the order is placed and is typically not field-changeable. See Switch Entry/Exit Configurations for more information.

Typical Layout — MotorSeT Load Break Interrupter Switch 400 A
Front view	Front interior view	Right side interior view

Legend — Typical Layout of MotorSeT Load Break Interrupter Switch (400 A)

A	Lifting eyebolts (removable)
B	Viewing window
C	Low voltage section
D	Medium voltage section
E	Disconnector switch handle
F	Ground bus
G	Ground bar for disconnector switch
H	800 A bus
I	Disconnector shield
J	Disconnector switch
K	Power fuses
L	Low voltage section hygrostat
M	Wireway
N	Motor landing pads
O	Space heater

Switch Entry/Exit Configurations

Enclosure

The enclosure is constructed of welded 11-gauge sheet metal. All doors are also 11-gauge sheet metal with flanges that provide a sturdy, rigid structure. Latches and hinges are constructed of corrosion-resistant material. The door interlocks help prevent the medium voltage doors from being opened when the disconnector switch is closed.

Enclosures are free-standing units available in NEMA 1, NEMA 3R, NEMA 12 and NEMA 12 V (ventilated enclosure with filter elements) configurations.

Optional Features

Surge Arresters

Surge arresters are furnished only when listed in the user’s specifications. The vulnerability of the incoming and outgoing lines to lightning strikes or other high voltage transient conditions determines their type and justification.

Heaters

Heaters come standard in outdoor equipment only. By maintaining a slight temperature differential, the heaters help keep the inside of equipment dry by helping prevent condensation and deterioration.

Heaters supplied with the equipment can be powered by either internal or external power. Ensure that either source of power is energized prior to placing the equipment into service. In all cases, the supply of power must be adequate to feed the entire heater load.

DANGER
HaZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Disconnect any backfed transformers and safely ground the primaries before energizing the auxiliary power. When supplying external sources of control power to this switch, it can cause backfeed to the high voltage bus through control power or potential transformers. Remove all grounds prior to energizing this equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HaZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Disconnect any backfed transformers and safely ground the primaries before energizing the auxiliary power. When supplying external sources of control power to this switch, it can cause backfeed to the high voltage bus through control power or potential transformers.
Remove all grounds prior to energizing this equipment.

Failure to follow these instructions will result in death or serious injury.