Gravity: Magnetic Latching Relay for ESP32 / Arduino

A Magnetic latching relay is a new type of relay.  It features low power dissipation and noiseless.  Unlike other non-latching relay, the latching relay needs two digital pulse signal to switch ON/OFF state. 

This DFRobot Gravity: magnetic latching relay is compatible with most popular microcontrollers such as ESP32 / Arduino / Raspberry Pi.  It can be used to remake home appliances or lighting controls, like smart electricity meters, lighting, sockets, switches, and so on. 

What is Magnectic latching relay?

 A latching relay is an automatic switch that stays in its last position when powered off, acting as a memory circuit. It helps reduce power consumption in applications compared to non-latching relays that consume more power. Latching relays have noiseless switching while non-latching relays hum. Magnetic latching relays are ideal for low power and high stability applications due to their low power, steady performance, long service life, and low-temperature rise.

Latching or Non Latching Relay?

Choosing between a latching or non-latching relay depends on the specific requirements of the application. Latching relays are preferred for applications that require low power consumption and low noise levels, while non-latching relays are more economical for situations where a short time delay is needed. The decision should be made by the designer after careful consideration of the application's needs and available options

Connection Diagram of Magnetic Latching Relay and Arduino

Features

• Low power consumption, 2.6mw-3.65mw
• Noiseless
• Trigger Pulse Width: 2ms
• Holding function
• 3.3V & 5V supported Arduino / ESP32 / Raspberry Pi / LattePanda

Applications

• Remaking home appliances
• Lighting controls
• Smart electricity meters
• Smart lighting
• Smart sockets
• Smart switches

Specification

• Signal Level: 3.3V, 5V
• Power Voltage: 3.3V-5V DC
• Trigger Pulse Width: 2ms
• Static Current: 0.73mA - 0.8mA(@3.3V-5V)
• Coil Operating Current: 137mA(3.3V), 93mA(5V)
• Contact Resistance: =100mO (1A 6V DC)
• Contact Material: AgSnO2
• Contact Load: 10A 36V AC (Resistive), 15A 36V AC (Incandescent lamp)
• Max Switching Voltage: 36V AC/30V DC
• Max Switching Current: 10A
• Max Switching Power: 36VA/300W
• Coil Rated Power: 0.4W
• Relay Action Time(@Rated Voltage): =8ms
• Relay Reset Time(@Rated Voltage): =5ms
• Operating Humidity Range: 5%-85%RH
• Operating Temperature Range: -40°C - 85°C
• Product Dimension(Package Not Included): 42×32mm/1.65×1.26”

Documents

• Product wiki

Parts List

• Magnetic Latching Relay ×1
• 3Pin Gravity Wire ×2