7102-12-1011

Turn Off Voltage (Min):	1 VDC
Coil Resistance:	1 kOhms
Coil Power:	--
Contact Material:	--
Operating Temperature:	-20°C ~ 85°C
Termination Style:	PC Pin
Mounting Type:	Through Hole
Features:	Diode, Electrostatic Shield
Release Time:	0.1ms
Operate Time:	1ms
Series:	7000
Turn On Voltage (Max):	9 VDC
Switching Voltage:	200VAC, 200VDC - Max
Contact Rating (Current):	500mA
Contact Form:	DPST-NO (2 Form A)
Coil Voltage:	12VDC
Coil Current:	12.0mA
Coil Type:	Non Latching
Part Status:	Active
Packaging:	Tube

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7102-12-1011 Reed Relay

A reed relay is a specialized type of contact relay which utilizes an electromagnet to move a reed switch between its open and closed states. Reed relays are named for the use of reed switches in their construction, which are enclosed within a vacuum or inert gas-filled glass tube. The switch is actuated by the relay’s electromagnetic field, allowing one to control which states the switch is in without direct contact with it.

Application Field

Reed relays are most commonly used in signal switching applications, but have applications in any situation where electrical signals need to be isolated, such as telecommunications, audio and video equipment, thermostats, medical instrumentation, and industrial controls. Reed relays provide higher isolation between input and output signals than other contact-type relays, making them ideal for situations where electrical noise may be present, or minimal contact resistance is required. This makes them particularly suitable for applications in high-frequency and RF use, such as radio frequency switching, radar, and microwave switching.

Uses

Reed relays are highly reliable and can be used in situations where the contacts may not be accessible directly, such as inside a vacuum tube or other confined space. This makes them especially useful for applications where a high switching speed is required. Additionally, since the reed switch is slightly shorter than its associated copper contacts, it is less susceptible to wear and tear, even when used in high-speed applications.

Design & Construction

The main components of a reed relay are an electromagnet, a reed switch, and a silicone rubber membrane. The electromagnet is a small coil of wire wrapped around an iron core and is energized by an electric current. When the current is applied, the electromagnet creates an electromagnetic field, which pulls the reed switch toward the electromagnet. The reed switch is held in place by a thin silicone membrane and functions as an electrical contact. When the voltage is applied, the reed switch will open or close depending on the force exerted by the electromagnetic field.

Working Principle

The working principle of a reed relay is simple: when the relay is energized, a magnetic field is created which pulls the reed switch towards the electromagnet. This causes the contacts of the switch to close, thereby completing the circuit and allowing current to flow. The reed switch will remain in the closed position until the electromagnet is de-energized, allowing the reed switch to return to its original state. Reed relays provide the advantage over other types of contact relays in that they require no direct contact with the closing mechanism, thus allowing for a higher level of isolation between the input and output signals.

Advantages

The design of reed relays makes them more reliable than other contact-type relays in many applications. They are also commonly used in situations where contact resistance is critical or contact bounce must be minimized. Furthermore, since reed switches are shorter than the copper contacts they control, they are often less susceptible to wear or fatigue. Additionally, reed relays are ideal for applications where a high switching speed is required, as the reed switch can open or close within microseconds. Finally, the use of a silicone membrane provides the additional benefit of a higher level of isolation between the input and output signals. Reed relays are a versatile type of contact relay, with a wide range of applications including signal switching, high-frequency switching, and other isolation requirements. Their compact design, high level of reliability, and ability to operate at high speeds make them suitable for a variety of applications.

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