Siemens DTU3005-B Especificaciones descargar pdf (Pagina 4)

General Information

Compact Size

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

a common width of 15 1/2 inches, a common depth of only 12 1/8

inches, a common mounting footprint, and common 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.

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 additional ven-

tilation. Detailed outline drawings of the breakers and drawout

elements are included in the Outline Dimensions section starting

on page 22.

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 Dimensions section starting

on page 22.

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 mechanism. Once the breaker is closed, the mech-

anism can be recharged. The breaker is now prepared for a rapid

open-close or open-close-open operation.

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 changed if the close button is depressed.

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1200A Size Frames

2000A Size Frames

Possible Number of Frames in a 90-inch Switchboard.

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

Main Stored Energy Spring in Front Compartment

Centralized Controls and Color-Coded Indicators

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Siemens DTU3005-B Especificaciones Pagina 4

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