ACB: 3WJ - Microprocessor based trip unit – 3WJ1225-2AF62-4DA4

Product Description

Siemens 3WJ Air Circuit Breaker (ACB) – Microprocessor Based Trip Unit – 3WJ1225-2AF62-4DA4

The Siemens 3WJ1225-2AF62-4DA4 is a SINOVA / SENTRON 3WJ series Air Circuit Breaker (ACB) designed for high-capacity low-voltage power distribution systems such as PCC panels, main LT switchboards, industrial plants, data centers, and infrastructure electrical networks. It is used where high fault level protection, selectivity, and reliable switching 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 class) that provides advanced protection functions including overload (L), short-time delay (S), instantaneous (I), and earth fault (G) with fully adjustable settings for precise coordination and system safety.

It offers a rated current of 2500A and a breaking capacity of 55kA at 440V AC, making it suitable for heavy-duty industrial and commercial power distribution systems requiring strong fault interruption capability and long-term operational reliability.

Key Features

• Siemens SINOVA / SENTRON 3WJ Air Circuit Breaker
• Microprocessor-based electronic trip unit (ETU360WJ)
• Protection functions: L, S, I & Earth Fault (G)
• 3-pole / 4-pole variants available (this model: 4-pole configuration)
• Rated current: 2500A
• Breaking capacity: 55kA at 440V AC
• Draw-out type construction for easy maintenance
• High selectivity and coordination capability
• Suitable for main incomer applications
• IEC 60947-2 compliant