LVD75F40

Series:	LVD
Packaging:	Bulk
Part Status:	Active
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	DC
Voltage - Input:	25.6 ~ 26.6VDC
Voltage - Load:	3V ~ 75V
Load Current:	40A
On-State Resistance (Max):	15 mOhms
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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LVD 75F40 Application Field and Working PrincipleSolid State Relays (SSR) are control systems typically composed of a semiconductor controller and an isolated switch. Such devices are considered reliable and offer efficient power management above all other types of relays. Specifically, the LVD 75F40 is a popular SSR component with specific application fields and understandings of its working principle.The accurate and reliable LVD 75F40 SSR from LittelFuse is a bi-directional device providing good current-handling capacities. According to the company, it is engineered to be used for low to moderate load current applications and is ideal for controlling both AC and DC loads.The SSR is most often used in industries pertaining to air-conditioning, machinery, and automation, such as temperature control, protective circuitry, and starter motor control. It can also be used as a signal device with its low profile design.A variety of protections are built in as well. The SSR’s input is protected from over-voltage with a varistor and high-frequency interference with a capacitor. Its output is protected through a free-wheeling diode and a bottom snubber. It can handle up to 3A of load current and has a voltage drop of 0.55V at maximum rated current.With its working principle in mind, the SSR works similarly to other electronic devices in that it is activated by a voltage or current that causes the internal switches to close. This process is initiated when a 3-volt to 32-volt control signal is applied to the SSR, also referred to as the “input control signal.”Once the SSR’s internal voltage drops to 0.4V, it will make the connection, completing the circuit, and the device is now turned “on.” This causes the AC or DC load voltage, referred to as the “input power source”, to be applied to the load.The SSR can also be turned “off” in a few ways. One option is to remove the control voltage completely from the SSR. This “open switch” disables the SSR’s ability to close thus interrupting the circuit and discontinuing power to the load.The second option is to apply a negative voltage to the control terminal, which will cause the SSR to open the switch and remove power from the load. This function is referred to as dynamic braking.The basic structure of the LVD 75F40 SSR consists of two parts – the control part and the output power part. However, the control part is especially important when looking at the output power part. When the voltage to the control part is below 0.8V, the SSR is off and power will not flow to the load. However, when the voltage is at or above 0.8V, it will turn on and power will flow.When the LVD 75F40 is in its switched off state, free-wheeling diodes protect the SSR from voltage transients to prevent damage. With all of its features, the LVD 75F40 offers good performance and is suitable for a variety of power management applications.Overall, the LVD 75F40 is a reliable SSR component that offers efficient control and protection for a variety of applications. Thus, it is popularly used in industries such as air conditioning, machinery, and automation. The device is activated when a 3 to 32-volt control signal is applied with a voltage drop of 0.55V at maximum rated current. The SSR works by initiating a connection when its internal voltage drops to 0.4V, then disconnecting the load when it is turned off in one of two ways. Its basic structure consists of two parts, the control and output power part. With its several features, the LVD 75F40 offers good performance and protection for a variety of power management applications.

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