8L21-05-01

Turn Off Voltage (Min):	0.5 VDC
Coil Resistance:	200 Ohms
Coil Power:	--
Contact Material:	--
Operating Temperature:	-20°C ~ 85°C
Termination Style:	PC Pin
Mounting Type:	Through Hole
Features:	Diode
Release Time:	1ms
Operate Time:	0.5ms
Series:	8L
Turn On Voltage (Max):	3.8 VDC
Switching Voltage:	200VAC, 200VDC - Max
Contact Rating (Current):	500mA
Contact Form:	SPST-NC (1 Form B)
Coil Voltage:	5VDC
Coil Current:	25.0mA
Coil Type:	Non Latching
Part Status:	Obsolete
Packaging:	Tube

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Reed Relays

Reed relays are one of the most popular choices of relay switches available in the market today. These little components have been used in a wide range of applications due to their specificalties, such as their light-weight, low-voltage operation, power-efficient operation, and their relatively low cost. A discussion about their use in the 8L21-05-01 application field and the working principles behind their performance is found in the following sections.

General Description:

Reed relays are basically a form of contactors that are driven by a magnetic field generated by an alternating current (AC) or direct current (DC) solenoid. They rely on the fast switching times and non-mechanical operation that such devices can achieve. The principle behind their operation is the use of a winding which generates a magnetic field which interacts with the reed switch to either make or break contacts of the circuit. The contacts are usually made up of a set of metal plates that line the body of the reed switch and are held in place by internal magnets.

Construction:

Reed relays are composed of a few main components, which are the contacts, winding, and case. The contacts of a reed relay are made up of a set of metal plates that are securely held in place by an internal magnet. The windings are simply coils of electrical wire, which create the magnetic field used to actuate the reed switch. Finally, the case of a reed relay is usually a sealed container made of a non-conductive material. This prevents outside environmental factors from influencing the operation of the relay.

The 8L21-05-01 Application:

The 8L21-05-01 is a reed relay specifically designed for low electrical load switching in electronics and electromechanical products. It is often used where fast switching times and low-voltage operation are needed, such as in the control of electrical motors. Such relays can also be used for electronic testing, switching of solenoid valves, and switching of other loads in industrial, laboratory, and medical equipment.

Working Principle of a Reed Relay:

The working principle behind the operation of a reed relay is the use of a solenoid, which is usually a coil of electrical wire that generates a magnetic field. When electricity is passed through the coil a magnetic field is generated, which interacts with the reed switch contained in the relay. As the magnetic field increases, it attracts the metal plates of the reed switch and when it passes a certain point, the contacts close and the circuit is completed. When the magnetic field is weakened or reversed, the contacts open and the circuit is broken.

Conclusion:

Overall, reed relays provide a reliable and cost-effective solution for many types of load switching requirements, such as in the 8L21-05-01 application field. Their small size, powerefficient operation, and fast switching time make them a great choice for a wide range of applications. Reed relays are also relatively inexpensive and easily available, making them a cost-effective option for a variety of applications.

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