Single Dual Coil Latching Relays are used in a variety of applications in industrial, commercial and domestic settings. They provide a convenient and reliable means of switching between two states. There are many different variations on how this is accomplished, involving the use of magnets, interlocking parts and single or double coils. These variations result in five basic designs of the magnetic latching relay.
A relay is a type of switch that can be used to control a circuit by transferring power from one part to another. These switches are available in a number of forms, including magnetic, electronic and solid-state, and can be used to perform a wide range of functions, from simple switch-on/off actions to more complicated switching tasks. They can be used to control lights, alarms, fans and other electrical devices. They can also be used in circuits where current is required to be passed between two points in a system, such as signal routing, audio and automotive.
The key difference between a traditional relay and a latching relay is that the latter maintains its position after it is triggered. Unlike a traditional relay, which needs to be constantly powered to stay activated, the Single Dual Coil Latching Relays only requires a brief pulse to switch between its two positions and then stays in the switched state until a new pulse is applied. This reduces the amount of energy used and eliminates the heat that would be generated by a constant current.
To set the relay into its first stable position, a current pulse must be applied to its coil. This pulse must be of a duration greater than the specified minimum for that particular relay type. The pulse must be repeated for the second and then third stable positions to complete the latching sequence. Once the relay is latched, it will remain in its last energized position until a new current pulse is applied to its coil.
This relay can be driven by both CMOS logic levels and TTL levels using either a half-bridge driver (if dual supply voltages are available) or an H-type power driver (if only a single supply voltage is available). In addition, the drive circuitry for these switches can be optimized to operate with minimal power consumption under static conditions.
When selecting a relay for your project, it is important to read the circuit operational description found in the technical data sheet. This will provide details about the relay’s working states and the polarity of the coil current that is needed to apply a set or reset command. It is also a good idea to examine the relay itself for markings that indicate whether it is a single-pole double throw (DPDT) or latching relay. It is also recommended to look at the terminal assignments/designations listed in the ISO and DIN terminal chart below. Using standard four pin uCables that match the ISO body style and DIN terminal arrangement allows for easy hook up of the relay. This will ensure that the red and green uActivate coil control LEDs properly respond to system set and reset command pulses.
