Siemens 3WJ Air Circuit Breaker (ACB) – Microprocessor
Based Trip Unit – 3WJ1225-2AF52-4DA4-Z
The Siemens 3WJ1225-2AF52-4DA4-Z is a SINOVA /
SENTRON 3WJ series Air Circuit Breaker (ACB) designed for high-capacity
low-voltage power distribution systems in industrial plants, PCC panels,
main LT switchboards, data centers, and infrastructure projects. It is used
where high fault levels, reliable selectivity, and intelligent protection of
large electrical loads are required.
This model belongs to the 3WJ1225 frame size (2500A
class) and is equipped with a microprocessor-based electronic trip unit
(ETU360WJ / LSI-G type) providing advanced protection functions such as overload
(L), short-time short-circuit (S), instantaneous protection (I), and earth
fault (G) with fully adjustable settings for precise coordination.
With a rated current of 2500A and a breaking
capacity of 55kA at 440V AC, it is suitable for heavy-duty industrial
and commercial power distribution systems requiring high reliability,
strong fault interruption capability, and long operational life.
Key Features
|
Parameter |
Specification |
|
Product Model |
3WJ1225-2AF52-4DA4-Z |
|
Brand |
Siemens |
|
Series |
SINOVA / SENTRON 3WJ |
|
Type |
Air Circuit Breaker (ACB) |
|
Frame Size |
3WJ1225 |
|
Rated Current |
2500 A |
|
Number of Poles |
3 Pole |
|
Breaking Capacity (Icu) |
55 kA @ 440 V AC |
|
Protection Functions |
Overload, short-circuit, earth fault |
|
Trip Unit |
Microprocessor-based ETU (LSI-G) |
|
Mounting Type |
Draw-out type |
|
Rated Voltage |
440 V AC |
|
Frequency |
50/60 Hz |
|
Standards |
IEC 60947-2 |
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