HDC100D120

Contactors (Solid State) are electrical devices used to start or control a variety of different types of electrical equipment. Solid state contactors, such as the HDC100D120, are used in applications ranging from simple appliance control to large industrial motor control. This article will provide an overview of the HDC100D120 application field and working principle.

HDC100D120 Application Field

The HDC100D120 is designed for use in applications with 24 volt DC, 380 volt three-phase AC and 480 volt three-phase AC. It is suitable for use for reversing load switching technologies and is commonly used in applications such as machines, welding equipment, AC motor control and in UPS systems.

HDC100D120 Working Principle

The HDC100D120 uses two NPN-type bipolar transistors as main switching elements. When a control voltage is applied to the controlling contacts, current flows through the two transistors, and the main switching element is turned on. When the control voltage is removed, the two transistors return to an open state and the main switching element is turned off. This on/off cycle is what provides the contactor\'s switching action.

The HDC100D120 also has an overload protection. This is achieved through a current sensing resistor which senses the current flowing through the device and provides protection if the current exceeds the rated value. An auxiliary contact is provided in order to provide a signaling circuit for use in controlling the motor or other device being switched.

The HDC100D120 also comes with a variety of accessories such as remote control relays, time delay relays and power fail relays, allowing for greater flexibility in system design. These accessories are particularly useful when the contactor needs to be responsive to low power signals from a control system.

Conclusion

The HDC100D120 is a solid state contactor designed for use with 24 volt DC and 380 - 480 volt three-phase AC applications. It is suitable for motor control, reversing load switching and UPS systems and features a built-in current overload protection and a range of additional accessories.