ACB: 3WJ - Microprocessor based trip unit – 3WJ1220-2AF52-4DA4

Product Description

Siemens 3WJ Air Circuit Breaker (ACB) – Microprocessor Based Trip Unit – 3WJ1220-2AF52-4DA4

The Siemens 3WJ1220-2AF52-4DA4 is a SENTRON / SINOVA 3WJ series Air Circuit Breaker (ACB) designed for reliable protection and control of low-voltage power distribution systems in industrial plants, PCC panels, main LT switchboards, data centers, and infrastructure applications. It is used where high fault levels, selective coordination, and intelligent protection of large electrical loads are required.

This model belongs to the 3WJ1220 frame size (2000A class) and features a microprocessor-based electronic trip unit (ETU360WJ class) that provides advanced protection functions including overload (L), short-time short-circuit (S), instantaneous (I), and earth fault (G) with fully adjustable settings for precise system coordination and safety.

With a rated current of 2000A 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 service life.

Key Features

• Siemens SINOVA / SENTRON 3WJ Air Circuit Breaker
• Microprocessor-based electronic trip unit (ETU360WJ)
• Protection functions: overload, short-circuit, instantaneous & earth fault
• 3-pole configuration
• Rated current: 2000A
• 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