Siemens TL.. Manuál s instrukcemi stáhnout pdf (Strana 7)

General Information

Compact Size

For space-limited installations, the 1200A and 2000A frames

offer a common width of 15

inches, a common depth of

only 12

inches, a common mounting footprint, and com-

mon bus center lines. This compact, shallow depth (even with

drawout breakers) permits stacking of six 800A or 1200A

breakers or four 2000A breakers in a standard switchboard.

This packaging is made possible by the insulated-encased

construction and thermal performance of the SB breaker. Even

when operated at 100% of the frame rating, no additional

ventilation is required for the 1200A and 2000A frames.

Possible Number of Frames in a 90-inch Switchboard.

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Example: Three 1200A and two 2000A breaker combination is possible.

When operated at 100% of the frame rating, 4000A and

5000A frames require 66 in

of ventilation space in the top and

bottom of the front cover. The 3200A frames require no addi-

tional ventilation. Detailed outline drawings of the breakers

and drawout elements are included in the Outline Dimensions

section starting on page 36.

Bus Spacing and Connections

Speciﬁc installation features of SB breakers include common

pole spacings and vertical connections. These pole spacings

allow for a standard bus connection as speciﬁed in UL 891.

Detailed outline drawings are contained in the Outline Dimen-

sions section starting on page 36.

Two-Step Stored Energy Mechanism

A two-step stored energy mechanism is used to close and

open the breaker. Energy is initially stored in the main springs

of the stored energy mechanism. When the breaker is closed,

spring energy is consumed and sufﬁcient energy is retained in

the breaker to perform the tripping function.

The stored energy mechanism may be charged manually

(standard) or electrically (optional). Pushbutton controls allow

for easy opening and closing. Color-coded indicators clearly

display the opened or closed status of the circuit breaker and

charged or discharged status of the stored energy mecha-

nism. Once the breaker is closed, the mechanism can be

recharged. The breaker is now prepared for a rapid open-close

or open-close-open operation.

Main Stored Energy Spring in Front Compartment

Centralized Controls

The manual charging handle, pushbutton control switches, and

color-coded indicators are grouped in the central escutcheon

on the front cover. The U-shaped construction of the charging

handle provides for a ﬁrm grip regardless of the position of the

breaker in the switchboard. For safety, the charging handle and

push-to-close pushbutton are interlocked. This interlock

prevents the breaker from being closed unless the charging

handle is in the stowed position, the position to which it will

automatically return when it is released. The interlock also

prevents the breaker from being manually charged if the Close

button is depressed. Operating instructions for the stored

energy mechanism and controls are in the Operating Instruc-

tions section starting on page 15.

Centralized Controls and Color-Coded Indicators

2000A Size Frames

1200A Size Frames

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