TD1225

Series:	T
Packaging:	Bulk
Part Status:	Active
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC, Zero Cross
Voltage - Input:	3 ~ 32VDC
Voltage - Load:	24V ~ 140V
Load Current:	25A
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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Introduction:
Solid State Relays (SSRs) are a type of relay that uses a semiconductor as its switching element as opposed to an electromechanical contact as in traditional relays. The TD1225 is one such SSR and is designed to offer reliable and compact circuit switching solution for industrial automation applications. It is most suitable for switching high current load with low-voltage control. This article examines the TD1225 application field and working principle.Application Fields:
The TD1225 is designed for applications that require current absorptions up to 25A. This makes it suitable for driving large motors and other high current loads. It is also designed to operate with low voltage control, being rated for control voltage between 4V and 32V DC, which makes it suitable for applications such as motor speed control, lighting, HVAC systems, and other industrial automation applications.Components & Structure:
The TD1225 has a 2-piece design that consists of a load terminal block and a control terminal block. The load terminal block houses two studs for the load connection and two screw terminals for the AC voltage connection. The control terminal block includes four screw terminals for the connection of the control voltage. The relay is also equipped with a fuse and an LED indicator for status feedback.Working Principle:
The TD1225 works on the principle of PhotoMOS technology. This technology uses an optically isolated photovoltaic cell to switch the relay from “on” to “off” state. When power is applied to the control terminals the light-emitting diode (LED) within the unit is energized which causes the photovoltaic cell to conduct current through the internal MOSFET (metal-oxide-semiconductor transistor). This causes the MOSFET to switch on and the relay to assume the active state. Conversely, when the control voltage is removed the LED is de-energized and the MOSFET is switched off, thus switching the relay off.Protection Features:
The TD1225 has several protection mechanisms designed to ensure safe and reliable operation. One such mechanism is over-current protection (OCP) which is designed to protect against damage from the overcurrent conditions. The OCP circuitry will trip and disconnect the relay output after a certain maximum current rating is exceeded. The TD1225 is also equipped with a thermal protection mechanism which is designed to ensure that the internal components do not overheat.Conclusion:
The TD1225 is a compact and reliable solid state relay that is designed for applications requiring current absorptions up to 25A. It is based on the PhotoMOS technology and works by switching on and off the internal MOSFET via an LED circuit. Additionally, therelay is equipped with various protection mechanisms such as OCP and thermal protection to ensure its safe operational conditions. This article has provided a brief overview of the TD1225 application field and working principle.

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