FXD63B125 | Siemens Circuit 3 Pole Circuit Breaker

Description

The Siemens FXD63B125 is a 3-pole circuit breaker from the Sentron Series. This type FXD circuit breaker is rated for 3-phase systems with a current capacity of 125A and a voltage rating of 600V. It offers a standard interrupting capacity of 35kA at 480V. Designed to operate at 40 degrees Celsius, this bolt-on circuit breaker is UL listed for reverse fed applications and includes non-interchangeable trip mechanisms. It features long-time and instantaneous trip functions and utilizes thermal magnetic trip technology. This molded case circuit breaker is provided without installed lugs. 

The Siemens FXD63B125 is a 3-pole circuit breaker from the Sentron Series, specifically classified under type FXD. This circuit breaker is designed to handle 3-phase (3PH) electrical systems and has a current rating of 125 amperes. It operates at a voltage rating of 600 volts AC. The interrupting capacity of this breaker is rated at 35kA at 480 volts, indicating its ability to interrupt significant fault currents without damage. 

The FXD63B125 features standard interrupting capacity and is designed for bolt-on mounting. It is UL listed, which certifies its compliance with the safety standards for reverse fed applications. This characteristic ensures that the breaker can safely handle power input from the load side, which is not common in standard circuit breakers. 

The circuit breaker employs a non-interchangeable trip mechanism. This means the trip unit is fixed and cannot be replaced or interchanged with another, ensuring consistent performance as per its design specifications. The trip functions provided include Long-Time and Instantaneous (LI), which cater to both prolonged overload conditions and short-circuit scenarios. The thermal magnetic trip unit combines both thermal and magnetic tripping mechanisms to provide comprehensive protection. The thermal component responds to prolonged overcurrent conditions by using a bimetallic element, while the magnetic component reacts instantly to high fault currents using an electromagnet.