Description

This Siemens Air Circuit Breaker (ACB) is a high-performance industrial switchgear component designed for the protection of electrical distribution systems. It is engineered to handle heavy loads while providing precise control and fault protection.

Key Features:

• Configuration: 3P (3-Pole), designed for three-phase electrical systems.
• Breaking Capacity: Rated at 55kA at 500V, meaning it can safely interrupt a fault current of up to 55,000 Amps without damaging the surrounding infrastructure.
• Mounting Type: Fix Type, which means the unit is bolted directly to the busbars or the panel frame (as opposed to a “withdrawable” or “draw-out” type).
• Operation: Motorized 220Vac. It features an integrated motor operator that automatically charges the spring mechanism, allowing for remote opening and closing—essential for automated power management systems.
• Protection: The ETU35WT Trip Unit

The ETU35WT serves as the “brain” of the circuit breaker. It is an Electronic Trip Unit (ETU) that provides:

• LSI Protection: It monitors and protects against Long-time delay (overloads), Short-time delay (short circuits), and Instantaneous tripping (high-level faults).
• Precision: Unlike thermal-magnetic breakers, this electronic unit allows for more granular settings to ensure the breaker only trips when absolutely necessary, minimizing downtime.