A shunt trip breaker works by incorporating a built-in shunt trip device that allows the breaker to be tripped remotely. The shunt trip device consists of a solenoid or coil that, when energized by an external control signal, mechanically triggers the breaker to open. This design ensures that the breaker can be tripped not only by its internal protective mechanisms but also by an external control signal for purposes such as emergency shutdowns, remote disconnection, or integrating with fire alarm systems.
A shunt trip breaker is triggered by an external electrical signal sent to the shunt trip coil. This signal typically comes from a control device, such as a switch, relay, or automation system. When the control device detects a condition that requires the breaker to open (e.g., an emergency stop button being pressed or a fire alarm being activated), it sends a voltage to the shunt trip coil. The energized coil generates a magnetic field that moves a mechanical linkage, causing the breaker to trip and open the circuit.
The working principle of a shunt trip involves using an electromagnetic mechanism to actuate the breaker. When the shunt trip coil receives an electrical signal, it creates a magnetic field that moves a plunger or armature. This movement mechanically triggers the trip mechanism of the breaker, causing the contacts to open and interrupt the circuit. This allows for remote or automated disconnection of power, enhancing safety and control in electrical systems.
Shunt trip breakers are normally closed during regular operation, meaning the electrical circuit is complete, and current flows through it. They remain in the closed position until the shunt trip coil is energized by an external signal. When energized, the shunt trip mechanism actuates, causing the breaker to trip and open the contacts, thereby interrupting the circuit and stopping the flow of current.
A Siemens shunt trip breaker works similarly to other shunt trip breakers. It includes a shunt trip coil that, when energized by an external control signal, triggers the breaker’s trip mechanism. Siemens shunt trip breakers are often used in industrial and commercial applications where remote or automated control of power circuits is required. The precise design and operation depend on the specific model, but the fundamental principle remains the same: an external signal energizes the shunt trip coil, causing the breaker to open and disconnect the circuit.
In a circuit, a shunt works by providing an alternative path for current to flow, typically parallel to the main path. Shunts are often used to measure current by creating a known, low-resistance path where a voltage drop can be measured. This voltage drop, proportional to the current, allows for accurate current measurement. In the context of a shunt trip breaker, the term “shunt” refers to the shunt trip mechanism, which is an auxiliary device that allows the breaker to be tripped remotely by an external signal. The shunt trip coil creates a magnetic field when energized, which triggers the breaker’s trip mechanism to open the circuit.