HE421A0550

Turn Off Voltage (Min):	0.4 VDC
Coil Resistance:	240 Ohms
Coil Power:	--
Contact Material:	--
Operating Temperature:	-40°C ~ 85°C
Termination Style:	PC Pin
Mounting Type:	Through Hole
Features:	--
Release Time:	1ms
Operate Time:	1ms
Series:	400
Turn On Voltage (Max):	3.75 VDC
Switching Voltage:	200VDC - Max
Contact Rating (Current):	500mA
Contact Form:	SPST-NO (1 Form A)
Coil Voltage:	5VDC
Coil Current:	20.8mA
Coil Type:	Non Latching
Part Status:	Obsolete
Packaging:	Tube

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Reed Relays and HE421A0550

Reed relays are electrical switches capable of switching DC or AC signals. They are an effective and versatile choice for many applications, and the HE421A0550 is a standard model. This article explains the field of application and working principle of this particular type of reed relay.

Applications of Reed Relays

Reed relays are used in a variety of applications, from process control to telecoms. In the environmental protection field, they are used to detect carbon monoxide levels, and to detect heavy metal contamination in water. In industrial automation, they are used in circuit breakers and other safety systems.In telecoms, reed relays can be used to switch multiple lines, allowing for faster data transfer and easier switching. They are also used in military communications equipment, as they are able to withstand extreme environmental and electromagnetic conditions.

HE421A0550 Reed Relay

The HE421A0550 is a type of reed relay, often used for circuit protection applications. It is easily wired onto any circuit board, and is capable of taking signals of up to 10 watts. The contacts are rated for 5 mA, and the valve is sealed to protect it from dust and moisture.The HE421A0550 is designed for circuits that have a large amount of current, and is suitable for switching both AC and DC power. It is also capable of withstanding high levels of interference, making it suitable for use in radio frequencies.

Working Principle of the HE421A0550

The HE421A0550 reed relay operates on the principle of magnetism. The core of the device is a combination of a permanent magnet and an electro-magnet. When the current passes through the electro-magnet, the magnetic field inside the relay increases. This increases the force of attraction between the two arms of the device, causing them to move towards the central point, thus completing the circuit.Once the current has passed through the relay, the electro-magnet turns off, and the permanent magnet begins to provide the force of attraction again. This causes the arms to move away from the central point, breaking the circuit.

Conclusion

The HE421A0550 is a reed relay which is popular for its versatility and reliability. It is suitable for a wide range of applications, from telecoms to industrial automation. Its working principle is based on magnetism, with an electro-magnet providing the force of attraction when it is energized.

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