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|Other Name:||DPDT Power Relay||Contact Ratings:||7A 240VAC; 10A 250VAC|
|Max.switching Voltage:||250VAC/30VDC||Max.switching Current:||15A|
|Max.switching Power:||2770VA/240W||Initial Contact Resistance:||100mΩMax At 6VDC 1A|
|Life Expectancy Electrical:||100,000 Operations(rated Load)||Contact Material:||Ag Alloy|
electromagnetic power relay,
miniature signal relay
Universal PCB mounted relay T73 10A 250VAC 5PIN SPDT, 19*15.5*15.8mm
Relay is an electromagnetic device which is used to isolate two circuits electrically and connect them magnetically. They are very useful devices and allow one circuit to switch another one while they are completely separate. They are often used to interface an electronic circuit (working at a low voltage) to an electrical circuit which works at very high voltage. For example, a relay can make a 5V DC battery circuit to switch a 230V AC mains circuit. Thus a small sensor circuit can drive, say, a fan or an electric bulb.
A relay switch can be divided into two parts: input and output. The input section has a coil which generates magnetic field when a small voltage from an electronic circuit is applied to it. This voltage is called the operating voltage. Commonly used relays are available in different configuration of operating voltages like 6V, 9V, 12V, 24V etc. The output section consists of contactors which connect or disconnect mechanically. In a basic relay there are three contactors: normally open (NO), normally closed (NC) and common (COM). At no input state, the COM is connected to NC. When the operating voltage is applied the relay coil gets energized and the COM changes contact to NO. Different relay configurations are available like SPST, SPDT, DPDT etc, which have different number of changeover contacts. By using proper combination of contactors, the electrical circuit can be switched on and off. Get inner details about structure of a relay switch.
Single Pole Double Throw (SPDT):
Such relay has 5 terminal pins which consists of a pair of coil pins, a common pin, a normally open (NO) pin and a normally closed (NC) pin. When the relay is not activated, the common pin is in contact with the NC pin and when it is activated, the common pin will break away from contact with the NC pin and subsequently makes contact with the NO pin. Also, when the relay is deactivated (from activated state), the common pin will conversely break away from contact with the NO pin and return back in contact with the NC pin.
Relays are used wherever it is necessary to control a high power or high voltage circuit with a low power circuit, especially when galvanic isolation is desirable. The first application of relays was in long telegraph lines, where the weak signal received at an intermediate station could control a contact, regenerating the signal for further transmission. High-voltage or high-current devices can be controlled with small, low voltage wiring and pilots switches. Operators can be isolated from the high voltage circuit. Low power devices such as microprocessors can drive relays to control electrical loads beyond their direct drive capability. In an automobile, a starter relay allows the high current of the cranking motor to be controlled with small wiring and contacts in the ignition key.
|Insulation resistance||100MΩMin at500VDC|
|Dielectric strength between open contacts||750VAC 50-60HZ(1 minute)|
|Dielectric strength between contacts and coil||1500VAC 50-60HZ(1 minute)|
|Operate time||10ms max.|
|Release time||5ms max.|
|Ambient temperature||-40°C ~ +85°C|
|Vibration resistance||10-55Hz,1.5mm double amplitude|
|Ambient humidity||40-85% RH|
Coil data (@20°C)
|Max Operate Voltage (VDC)||Min Release Voltage (VDC)||Max Applied Voltage (VDC)|
PCB board layout and Wiring diagram: