Siemens DTU3005-B Spezifikationen PDF herunterladen (Seite 5)

Description Stationary and Moveable Drawout Elements

Simplified Minimum Depth Drawout Mechanism

The two elements of a drawout constructed SB Encased Systems

Breaker are the stationary drawout element and the moveable

drawout element. The stationary drawout element mounts from

the front or bottom into a standard switchboard. Bottom mounting

flanges are provided for optional mounting arrangements. The

moveable drawout element mounts onto the stationary drawout

element’s two extension rails. This allows the moveable draw-

out element to be racked in and out of the stationary drawout

element. For inspections, the moveable drawout element must

be removed from the extension rails to a work area. Refer to page

22 for outline drawings of the two types of drawout elements.

Each moveable drawout element has four positions: (1) Con-

nected, (2) Test, (3) Unlocked (only), and (4) Unlocked/ Withdrawn.

A racking mechanism with a low-force pump handle moves the

moveable drawout element between the connected, test, and

unlocked positions. The pump handle is an integral part or the

racking mechanism, and no auxiliary racking device or tool is re-

quired. In the unlocked position the movable drawout element

is disengaged from the racking mechanism. The moveable draw-

out element can be easily pulled between the unlocked position

and the withdrawn position. A color-coded indicator displays the

position of the moveable drawout element.The integral pump

handle and two levers are used to control the movement of the

moveable drawout element. A single release lever automatically

locks the moveable drawout element when it reaches the test

or the connected position. The moveable drawout element is

released to move to the next position by simply pushing and

releasing the release lever.

Pushing the release lever with the SB breaker contacts

closed open the breaker. You do not have to hold the release

lever to rack the moveable drawout element A directional shift

lever determines the direction the moveable drawout element

will move when the pump handle is pulled or pushed.

Secondary disconnect sliding terminal blocks for terminating

internal accessories are mounted on the sides of the stationary

and moveable drawout elements. The secondary disconnects

are mated as the moveable drawout element is moved from the

withdrawn position to the unlocked position. The terminal points

of the secondary disconnects are identified in the Internal and

External accessories sections.

Extension

Rails

Secondary

Disconnects

(right side)

Bus Stabs

Stationary Drawout Element

Moveable Drawout Element

Side View Shown

Finger

Clusters

Moveable

Drawout

Element

Racking

Pump

Handle

Directional

Shift Lever

(on side panel)

Release

Lever

Position

Indicator

Line Side

Load Side

Connected

Position

Test

Position

Bus Sub (In

Stationary

Drawout

Element)

1 2 3 4 5 6 7 8 9 10 ... 49 50

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