ACB: 3WJ Accessories for electronic trip unit – 3WJ9111-0AH02

Product Description

Siemens 3WJ ACB Accessories – Electronic Trip Unit Cover – 3WJ9111-0AH02

The Siemens 3WJ9111-0AH02 is a trip alarm switch accessory designed for SENTRON 3WJ Air Circuit Breakers (ACB). It provides a reliable first-trip indication signal, ensuring immediate notification when the breaker trips due to electrical faults such as overload, short circuit, or earth fault.

This accessory is essential for monitoring and protection coordination in low-voltage switchgear systems, helping operators quickly identify fault conditions and improve system reliability. It is widely used in industrial plants, commercial buildings, data centers, and critical power distribution networks where continuous monitoring of circuit breaker status is required.

Engineered with Siemens precision, it ensures accurate signaling, long service life, and high operational safety in demanding electrical environments.

Key Features

• Siemens SENTRON 3WJ series ACB accessory
• Part Number: 3WJ9111-0AH02
• Trip alarm switch (first fault indication)
• Provides instant “TRIP” status signal output
• 1 CO (changeover) contact output
• Enhances fault monitoring and system diagnostics
• Modular plug-in design for easy installation
• High electrical reliability and durability
• Suitable for industrial LV switchgear applications
• Complies with IEC 60947 standards