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3WL Air Circuit Breakers

15

Siemens · 2012

3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)

General data

ETU15B electronic release

ETU25B electronic release

Application:

Simple building and system

protection without time-selective

coordination up to 4000 A. Not to

be used for size III.

Features:

• Adjustable overload protection

with

I

2

t

characteristic curve

with preset delay time

t

R

= 10 seconds at 6 ×

I

R

• Instantaneous short-circuit pro-

tection adjustable in the range

2 ... 8 ×

I

n

• Overload display

• Protection function is set by

means of the rotary coding

switch

For technical details see the table

"Functional Overview of the

Electronic Release System"

under "Technical Specifications".

NSE0_00954b

Option: safety lock

prevents pressing of

reset button after

overcurrent release

Indicator: fault in

overcurrent release

Sealing ring

Test socket

Mechanical RESET

for reclosing lockout

and mechanical

tripped indicator

Rotary switch for setting

value, overload release

Rotary switch for setting

value, instantaneous

short-circuit release

Indicator: overload alarm

Indicator: overcurrent

release activated

Application:

Classical building, motor and sys-

tem protection with time-selective

coordination for up to 6300 A

Features:

• Adjustable overload protection

with

I

2

t-

characteristic curve

Delay time

t

R

= 10 seconds at 6 ×

I

R

• Short-time delayed short-circuit

protection adjustable in the

range 1.25 ... 12 ×

I

n

and

• Instantaneous short-circuit pro-

tection preset

to 20 ×

I

n

, max. 50 kA

• Can be adapted at any time to

the required plant currents

through retrofittable rated cur-

rent module,

thus ensuring overload protec-

tion in the range from 100 A to

6300 A.

• Overload display

• Indicates the reason for tripping

by means of an LED

• Test facility for the release

• Protection functions are

set by means of the

rotary coding switch

For technical details see the table

"Functional Overview

of the Electronic Release System"

under "Technical Specifications".

NSE0_00955b

Rating Plug

ETU25B

Option: safety lock

prevents pressing of

reset button after

overcurrent release

Indicator: fault in

overcurrent release

Sealing ring

Test socket

Mechanical RESET

for reclosing lockout

and mechanical

tripped indicator

Rotary switch for setting

value, overload release

Rotary switch for setting

value, instantaneous

short-circuit release

Indicator: overcurrent

release activated

Indicator: overload alarm

Query pushbutton

Test pushbutton

Clear pushbutton

Indicator: cause of release

Rotary switch for delay,

short-circuit release

Rated current module

Short-circuit protection

fixed setting

© Siemens AG 2011

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