BT137B-800,118

Thyristors - TRIACs

Thyristors are electronic components used to control electric currents. They can be used as switches, rectifiers, or regulators of the AC or DC current flow. Thyristors are also known as back-to-back connected Silicon Controlled Rectifiers (SCRs).The most popular Thyristor today is the Triac, a three-phase SCR. The TRIAC stands for Triode for AC. It is an unidirectional bidirectional switch with three terminals that can control either the AC current or DC current. It consists of two SCRs connected in parallel with their anodes connected to the two main terminals and the gate connected to the third terminal. The TRIAC is the main component of the BT137B-800,118 which is the common type of power circuit breaker.

BT137B-800,118 Application Field and Working Principle

The BT137B-800,118 is a popular power circuit breaker utilized in many industries. It is typically used in applications such as motor control, soft start applications, light dimming applications, as well as contactor and circuit breaker replacement applications. It is a fast-acting circuit breaker suitable for use in a variety of circuits, including both single-phase and three-phase applications.

The BT137B-800,118 is a triac thyristor-based power circuit breaker. The device consists of two thyristors and a single gate, with each thyristor having two anodes. The gate is connected to the third terminal. When voltage is applied to the gate terminal, current flows in one direction through the two thyristors. When reversed voltage is applied to the gate, the current will flow in the opposite direction. This alternating sequence is repeated and thereby limits the amount of current that can flow through the circuit.

The device is designed to protect connected electrical loads from over-current, over-voltage, or over-temperature conditions. The use of a TRIAC instead of a conventional relay ensures reliable operation and fast response in case of fault. The device is also able to interrupt circuits with relatively large inductive and capacitive components, which allows it to be used in applications involving high inrush currents such as motors and lighting.

The BT137B-800,118 has a maximum current rating of up to 800A, making it suitable for use in various industrial, commercial, and domestic applications. It also has a variety of operating temperature and voltage ratings, which makes it suitable for use in a wide range of applications. The device is able to operate at both alternating as well as direct current and is designed for use in wide range of applications, making it one of the most versatile circuit breakers available.

In summary, the BT137B-800,118 is a power circuit breaker mainly composed of two Triac thyristors. Being bidirectional and versatile, it is a suitable device for use in both single-phase and three-phase applications. Its ability to interrupt circuits with large inductive and capacitive components makes it especially suitable for motor and lighting applications. It is also able to operate at a wide range of temperatures and voltages, making it an ideal choice for many industrial, commercial, and domestic applications.