Description

The Siemens RL‑4000 Air Circuit Breaker is a high-capacity low-voltage power circuit breaker designed for heavy industrial power distribution and switchgear applications. Manufactured by Siemens, the RL-4000 belongs to the RL series of air circuit breakers and is built to provide reliable protection against overloads, short circuits, and ground faults in large electrical systems.

SIEMENS RL – 4000 features a 4000-amp frame rating and supports system voltages up to 600 VAC. It is commonly supplied in a draw-out configuration, allowing the breaker to be safely removed from the switchgear for inspection, maintenance, or replacement without disconnecting the entire system. The breaker typically incorporates solid-state or Static Trip II/III electronic trip units, providing protection functions such as long-time, short-time, instantaneous, and ground-fault protection (LSIG).

This SIEMENS RL- 4000 breaker is widely used in industrial facilities, large commercial buildings, and utility distribution systems where high current capacity and dependable fault interruption are critical. With interrupting ratings up to approximately 85 kA at 480 V, the RL-4000 is engineered to safely isolate faults and protect electrical equipment from severe damage.

The SIEMENS RL- 4000 robust air-insulated design and modular internal components make the breaker suitable for long-term service in switchgear assemblies, motor control centers, and power distribution substations.