Part Number: AZ2150-1A-12DEF

Manufacturer: American Zettler

Description: General Purpose Relay SPST-NO (1 Form A) 12VDC Coil Through Hole

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Relays manufactured by American Zettler have long been known for their superior craftsmanship and engineering, both of which are traditional hallmarks of the company. Over more than a century, Zettler has garnered a worldwide reputation for providing exceptional performance. American Zettler, which has its headquarters in California, is in the business of manufacturing more than forty distinct kinds of relays. These relays are designed to fulfill the myriad of unique needs associated with commercial and industrial applications.

Due to their excellent reliability, American Zettler relays are used in computer peripherals, telecommunications systems, office automation equipment, household appliances, security systems, test and measurement devices, industrial controls, and other electric and electronic equipment.

This relay is a small power relay capable of handling 40 Amps and belongs to the AZ2150 family. The voltage ratings are available for the AZ2150 series range from 5 to 110 volts. This package can be purchased with either a Single Pole Single Throw (SPST) (-1A) contact arrangement or a Single Pole Double Throw (SPDT) contact arrangement. Both of these configurations are available to purchase (-1C).

The AZ2150 is chosen for a reliable and long-lasting relay due to its life expectancy of 10,000,000 operations. AZ2150 can be epoxy-sealed (this version is denoted by adding an “E” to the end of the part number; for example, AZ2150-1AC-24DE).

AZ2150-1A-12DEF Description

The AZ2150-1A-12DEF is a General Purpose Relay with an SPST-NO (1 Form A) 12VDC Coil Through a Hole with an Operating temperature range of -55 to 85 degrees Celsius. This particular item has a Switching Voltage of 30V, a Nominal Coil Voltage of 12V, and a Resistance of 155 for its Coil. It has a power rating of 500 milliwatts, and the material that makes up its contacts is silver cadmium oxide.

Specifications and Features

Contact Material Cadmium, Silver
Mount Through Hole
Number of Pins 4
Weight 25 g
Coil Current 77.42 mA
Coil Resistance 155 Ω
Coil Voltage (DC) 12 V
Max Current Rating 40 A
Max Operating Temperature 125 °C
Max Voltage Rating (AC) 300 V
Max Voltage Rating (DC) 30 V
Min Operating Temperature -55 °C
Operate Time 8 ms
Termination PC Pin
Throw Configuration SPST
Lead-Free Lead-Free

Frequently Asked Questions

What Is A Power Relay?

Electromagnets assist power relays open and close circuits. A relay’s actual construction consists of an electromagnet coil, a spring, an armature, and one or more contacts. The spring helps to keep the armature in place. When the power relay is in its off state, the circuit will not be completed if it is ordinarily meant to have an open position.

The electromagnet draws in the armature, a movable arm often formed of iron, when power is supplied to the power relay, typically accomplished by using a battery as the power source. The spring-supported armature is pulled toward the Coil until it collides with a contact, which completes the circuit.

The spring was responsible for holding the armature in place. If the relay is set to have its normally closed position, the Coil will draw the armature away from the contact, allowing current to flow through the circuit.

A power relay can work with a very low voltage and conduct a significantly higher voltage. For this reason, power relays are utilized in various applications, including automobile electronics,  audio amplification, and telephone systems. In the early days of computing and telegraphy, power relays were also utilized to relay signals from one circuit to the next.

Because the multitude of electrical components and systems found in automobiles are all powered by a single 12-volt battery, the application of power relays in autos is a natural fit. The horn, the power train system, and the windshield wipers are just a few of the components controlled by the vehicle’s relays, often present in quantities of twenty or more. Although relays in an automobile can be located anywhere throughout the car, the fuse box is typically the location of the relays that are susceptible to wear and tear and are, therefore, most likely to require replacement. Because the power relays are stored in this area, it is simple to locate and replace them as necessary.

How Does A Power Relay Work?

A power relay consists of an electromagnet (Coil and iron core), an armature, a spring, and one or more pairs of contacts, at its most fundamental level of construction.

When using ordinarily open contacts, or NO, a modest current is allowed to travel via the input circuit, which triggers the electromagnet. The magnetic field that is produced causes the armature to be drawn toward it, bringing the contacts closer together, completing the second circuit, and enabling a significant amount of current flow. When the power is cut off to the device, the armature will no longer be attracted to it. The spring returns the armature to its resting position, uncoupling the connections. This will cause the device to stop receiving power.

It is done oppositely in the case of a normally closed (NC) relay. The contacts remain closed as a result of the return spring. The electromagnet pulls the armature toward it when the input circuit is triggered. Because of this, the force of the return spring is overcome, and the normally closed contacts open up, which prevents electricity from flowing through the second circuit. As a result, NC relays always maintain the more extensive circuit in the “on” position while they are used.

What Is The Purpose Of A Power Relay?

The state of the input, also known as the Coil, determines whether a piece of machinery known as a power relay opens or closes a circuit using an electromagnet. The device’s input determines the state of the information. Their rated impulse voltage is typically between 4,000 and 6,000 volts, providing a high isolation level between the control signal (the Coil) and the output (the contacts).


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