ACB: 3WJ - Microprocessor based trip unit – 3WJ1232-2AF52-1AA0

Product Description

Siemens 3WJ Air Circuit Breaker (ACB) – Microprocessor Based Trip Unit – 3WJ1232-2AF52-1AA0

The Siemens 3WJ1232-2AF52-1AA0 is a SENTRON / SINOVA 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 installations. It is used where high fault-level protection, selective coordination, and reliable switching of large electrical loads are required.

This model belongs to the 3WJ1232 frame size (3200A 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 system coordination and safety.

With a rated current of 3200A and a breaking capacity of 55kA at 440V AC, it is suitable for heavy-duty industrial and commercial power distribution systems requiring strong fault interruption capability and high 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)
• 4-pole configuration (typical for 3WJ1232 frame applications)
• Rated current: 3200A
• 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