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|Other Name:||Miniature Electromagnetic Relay||Contact Ratings:||1A 120VAC;2A/24VDC|
|Max.switching Voltage:||240VAC/60VDC||Max.switching Current:||2A|
|Max.switching Power:||120VA/30W||Initial Contact Resistance:||100mΩMax At 6VDC 1A|
|Life Expectancy Electrical:||100,000 Operations(rated Load)||Contact Material:||Ag+Au|
Telecom relay 4078(OMRON G5V-2) 3V~48V , contact form 2C 20*9.9*12.2mm
A simple electromagnetic relay consists of a coil of wire wrapped around a soft iron core (a solenoid), an iron yoke which provides a low reluctance path for magnetic flux, a movable iron armature, and one or more sets of contacts. The armature is hinged to the yoke and mechanically linked to one or more sets of moving contacts. The armature is held in place by a spring so that when the relay is de-energized there is an air gap in the magnetic circuit. In this condition, one of the two sets of contacts is closed, and the other set is open. Other relays may have more or fewer sets of contacts depending on their function. The relay also has a wire connecting the armature to the yoke. This ensures continuity of the circuit between the moving contacts on the armature, and the circuit track on the printed circuit board (PCB) via the yoke, which is soldered to the PCB.
When an electric current is passed through the coil it generates a magnetic field that activates the armature, and the consequent movement of the movable contact(s) either makes or breaks (depending upon construction) a connection with a fixed contact. If the set of contacts was closed when the relay was de-energized, then the movement opens the contacts and breaks the connection, and vice versa if the contacts were open. When the current to the coil is switched off, the armature is returned by a force, approximately half as strong as the magnetic force, to its relaxed position. Usually this force is provided by a spring, but gravity is also used commonly in industrial motor starters. Most relays are manufactured to operate quickly. In a low-voltage application this reduces noise; in a high voltage or current application it reduces arcing.
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||500VAC 50-60HZ(1 minute)|
|Dielectric strength between contacts and coil||1000VAC 50-60HZ(1 minute)|
|Operate time||6ms max.|
|Release time||4ms max.|
|Ambient temperature||-30°C ~ +70°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: