B512FS-2T Discrete Semiconductor Products

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B512FS-2T application field and working principle

Thyristors are a class of semiconductor components widely used in power control and conversion applications. The B512FS-2T series are power thyristors module used in railway applications and feature a reverse blocking device. This includes reverse blocking capability and overload protection. With its molded epoxy case, the module offers I2t ratings that should be used when sizing fuse or circuit breaker for motor control and switching applications.

B512FS-2T Overview

The B512FS-2T series thyristors module is designed to switch large power with a reverse blocking device to protect the circuit against misapplication or faulted operation. Additionally, the B512FS-2T series has overload protection, allowing it to be used in railway applications, such as start-stop operations, lighting and transformers.

The B512FS-2T series thyristor module requires a minimum 3-phase input of 110 volts DC and a 40 amp current. It also requires a 400V DC reverse blocking voltage, allowing the module to handle two-level switching applications. The device includes:

• An SCR that has a maximum on-state voltage drop of 1.5 volts.
• A diode that has a maximum on-state voltage drop of 1 volt.
• An overload protection device consisting of a diac Rated for up to 35A.

The B512FS-2T series offers an isolated construction that prevents hazardous electrical shock from a failed module. It also features a thermally conductive and insulated plastic case offering 4-pole terminals that allow for easy assembly, disassembly and replacement.

Working Principle of B512FS-2T

The B512FS-2T thyristor module is designed to provide power control in railway applications. It works by converting electrical energy into heat, where the heat is then converted back into electricity.

The device consists of two parts—an SCR (silicon controlled rectifier) and a diode, known as the antiparallel diode. Basically, one side of the device is the SCR, which can remain either open or closed, depending on the amount of current flowing through it. The reverse blocking device acts as a fail-safe in case the SCR is left in the open position, preventing any backpressure or reverse-diode current from flowing.

The other side of the device is the diode, which works to limit the amount of current flowing through the device by acting as a kind of "valve". The antiparallel diode acts as a check valve, letting current flow through the SCR only when the voltage is above the reverse breakdown voltage of the diode.

The B512FS-2T thyristor module also includes additional device protection, including overload protection. This works by limiting the amount of current that can flow through the device, so that it does not exceed its rated power.

Conclusion

In conclusion, the B512FS-2T thyristor module is designed to provide power control in railway applications. It works by converting electrical energy into heat, where the heat is then converted back into electricity by the SCR and diode. The reverse blocking device and overload protection provide additional device protection for a safer and more reliable operation.

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