ELM 2-21MM

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Electromagnetic latching relays, often abbreviated to ELM, are relays whose latching state is set by energizing the electromagnetic field of a coil to a given magnitude. Two-plate type ELM have two-pole switching capability, making them well suited for use as switches that hold or open a circuit. ELM 2-21MM relays are designed to provide reliable instantaneous switching while using minimum power consumption.

ELM 2-21MM relays come in a variety of package sizes, ranging from 0.31 x 0.38 inches to 0.5 x 0.67 inches, and are terminated by right angle or vertical solid pin arrangements. They have a maximum voltage rating of 21 VDC or 24 VAC and can switch loads up to 18 amps. An LED indicator is mounted to the relay casing, allowing for easy visual indication of relay status.

ELM 2-21MM relays are widely used in a number of applications, ranging from automotive and appliance control to process control and HVAC. They can be used to switch batteries and coils, drive motors and solenoids, control fan speeds, and control various lighting states. In addition, they are commonly used to detect the opening or closing of a circuit, as well as to carry out time delay functions.

The working principle of ELM 2-21MM relays lies in its latching state, which is set by energizing the electromagnetic field of a coil to a given magnitude. When power is applied to the coil, it creates a magnetic field which attracts a small metal armature, or link, towards the coil and causes the armature to engage the contacts of the relay. This in turn switches the relay state from open to closed. Applying power again to the coil will de-energize the armature and back again to its original position, thereby switching the relay\'s state open. This same principle allows for two-pole operation.

Compact, reliable, and easy to use, ELM 2-21MM relays have proved to be a popular choice for those looking for an economical and efficient solution to their electrical switching needs. Whether using the relay to switch batteries and coils, drive motors and solenoids, or control fan speeds and various lighting states, the ELM 2-21MM makes a great choice.

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