Siemens TL.. Instruction Manual download pdf (Page 8)

Description

Stationary and Moveable Drawout Elements

Simpliﬁed Minimum Depth Drawout Mechanism

The two elements of a drawout constructed SB Encased Sys-

tems 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 drawout element to be racked in and out

of the stationary drawout element. For inspections, the move-

able drawout element must be removed from the extension

rails to a work area. Refer to outline drawings of the two types

of drawout elements starting on page 36.

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

nected, (2) Test, (3) Unlocked (only), and (4) Unlocked/With-

drawn. A racking mechanism with a low-force pump handle

moves the moveable drawout element between the con-

nected, test, and unlocked positions. The pump handle is an

integral part of the racking mechanism, and no auxiliary racking

device or tool is required. In the unlocked position the move-

able drawout element is disengaged from the racking mecha-

nism. The moveable drawout element can be easily pulled

between the unlocked position and the withdrawn position. A

color-coded indicator displays the connect, test, and unlocked

positions of the moveable drawout element.

Stationary 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 ele-

ment 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.

Side View Shown

Pushing the release lever with the SB breaker contacts

closed opens the breaker. You do not have to hold the

release lever to rack the moveable drawout element. A direc-

tional 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 station-

ary and moveable drawout elements. The secondary discon-

nects are mated as the moveable drawout element is moved

from the withdrawn position to the unlocked position. The ter-

minal points of the secondary disconnects are identiﬁed on

page 59. Step-by-step instructions for operating the racking

mechanism begin on page 18.

Moveable Drawout Element

Bus Stabs

Secondary

Disconnects

(right side)

Extension

Rails

Line Side

Connected

Position

Test

Position

Load Side

Bus Stab (In

Stationary

Drawout

Element)

Finger

Clusters

Moveable

Drawout

Element

Directional

Shift Lever

(on side panel)

Position

Indicator

Racking

Pump

Handle

Release

Lever

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Siemens TL.. Instruction Manual Page 8

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