Compact circuit breaker LS TS400N FMU 300A 3P

Compact circuit breakers LS TS400N FMU – reliable installation protection

LS TS400N series compact circuit breakers are a basic protective element in modern electrical installations. They provide effective protection of devices and distribution networks against overloads and short circuits, guaranteeing safety and continuity of power supply. The TS400N FMU 300A 3P model is distinguished by high current parameters and a solid construction, making it an ideal solution for both professionals and end users.

Characteristics and application

The LS TS400N FMU 300A 3P circuit breaker is a three-pole compact circuit breaker with a rated current of 300A. It has an adjustable thermal release (FMU) with three settings (0.8, 0.9, 1.0 x In), allowing for precise adjustment of the characteristics to the specifics of the protected circuit. This ensures that the device reacts well to overloads while minimizing the risk of unnecessary tripping during short-term current surges – e.g. when starting motors. The short-circuit breaking capacity at 65kA guarantees safe disconnection of the circuit in the event of a serious failure.

These circuit breakers are used in a wide range of installations, including:

• Main and metering switchboards
• Power supply for machines and industrial equipment
• Building installations (commercial, residential facilities)
• Energy distribution systems

Construction and product features

The TS400N FMU circuit breaker is characterized by a solid construction and high quality workmanship. The housing made of durable materials provides resistance to mechanical damage and environmental conditions. Mounting is done by screwing onto a busbar or distribution panel. The FMU release allows you to adjust the time-current characteristics to the needs of a specific application, which translates into optimal installation protection. In addition, the circuit breaker meets the requirements of the IEC standard, which confirms its safety and reliability.

• Three-pole construction: provides full protection for three-phase electrical circuits
• Adjustable thermal release (FMU): allows precise adjustment to the load characteristics
• High short-circuit breaking capacity (65kA): guarantees safe disconnection in the event of a failure
• Solid construction: ensures durability and resistance to damage
• IEC compliance: confirms the safety and reliability of the device
• Wide range of operating voltages: AC 690V / DC 500V – versatility of application
• Busbar mounting: facilitates integration with existing distribution systems