LBB127S

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Solid State Relays provide a wide range of electrical power switching capabilities which extend into numerous applications and today, even offer specific relays designed to meet the needs of many different fields. The LBB127S solid state relay (SSR) is a popular relay used in a variety of applications ranging from industrial to domestic, and Military and aerospace. In this article, we will provide a brief overview of the LBB127S’s primary application fields and notable features, as well as an explanation of its working principle.

Application Fields

The LBB127S is typical of many other commercially available SSRs and is designed for general purpose power switching. It is capable of switching up to 1 kilowatt (kW) of power (30 Adc at 30 Vdc) and distribution voltages up to 240 Vac. Its common applications include machine shop machinery, industrial automation, external lighting and heating systems, home appliances, tools, office equipment, street lighting, material handling systems, and automotive and agricultural equipment. Additionally, the LBB127S is also ideal for Military and aerospace applications that require a robust solid state relay with a long service life.

The LBB127S’s superior surge and transient protection against voltage or current overload helps it withstand harsh climates and extreme temperature conditions. It also features protection circuits such as varistor snubbers and LED indicators for status feedback. Furthermore, because it is suitable for both asynchronous and synchronous switching, it is suitable for a variety of application fields.

Notable Features

The LBB127S features a 4-pin package that is typically constructed of either standard thermoplastic or stainless steel. Its primary circuit is designed to protect the protected against short circuit and over voltage conditions, while its secondary circuit is a PTC thermistor structure designed for temperature stability. Its optically coupled structure employs a high-voltage isolated zero-crossing switch to protect its circuits against load surge or transient events and provide a uniform switching operation.

It also has a unique ability to detect extremely low voltage loads without the need for any external components. Its low load detection feature is especially useful for applications involving low impedance loads such as microcontrollers and limited current LEDs. Moreover, the LBB127S is designed to withstand a wide operating temperature range from -40°C to +80°C and provides excellent EMC performance.

Working Principle

The main component of a LBB127S is an optically isolated triac and its operation is based on a zero voltage switching principle. Essentially, it switches on when the current in the circuit reaches zero, and switches off when the current again reaches zero. This ensures that the triac does not arc and reduces resistive losses in the circuits.

To achieve zero-crossing operation, the LBB127S uses an optical isolation barrier between the input and output circuits. This isolator works by reflecting light from an LED off a photodetector (usually a photodiode or a phototransistor) and limiting the current flowing through the device. When the reflected light reaches a certain threshold, the triac is triggered and the current flowing through the device increases until it reaches zero.

The LBB127S also includes an SCR surge suppresser, varistor snubber circuits, and LED indicators for status feedback. These components work together to help protect the input and output circuits from voltage and current overloads. The provided surge suppresser is designed to absorb voltage fluctuations in the incoming current, while the varistor snubber circuits are designed to suppress both over-voltage and under-voltage conditions.

The LED indicators are used to provide a visual indication of the relay’s status, whether it is on or off. Furthermore, the LBB127S is designed with an integrated logic design which allows it to be used with a variety of devices such as a microcontroller or TTL logic.

In summary, the LBB127S is an ideal choice for a wide variety of applications. Its excellent features such as surge and transient protection, temperature stability, low load detection, and reactive snubbers make it an ideal choice for various industrial and Military and aerospace applications. Additionally, its 4-pin package, zero voltage switching principle, and integrated logic design offer great flexibility and advantages.

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