2 Channel Smart Dual Coil Latching Relay Board – 2 Channel Bistable Relay Module

  • Rajkumar Sharma
  • 17 Views
  • moderate
  • Tested
  • SKU: EL129384
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This is a Smart Dual Coil Latching Relay that can control the ON/OFF power of a device by applying a short voltage pulse to Input 1 and Input 2. This project is helpful in low-power applications since the coil is not powered all the time, it only requires a short voltage pulse. Relay Coil also remains in that position even if the power is disconnected. Polarized, bi-stable, latching relays are utilized in many kinds of electronic equipment and diverse applications. These relays usually employ two coils, one to move the relay contacts(s) from the open to close position and another coil to move the contacts(s) from the close to the open position.  to facilitate mechanical movement, the relay coils need to be energized for a specific time interval. Once the contact(s) have changed position, the voltage should be removed from the winding of the relay. As shown in the schematic, a dual-coil relay is connected to its supply rail at the center point of the two relay windings Each winding can be energized by applying a TTL-short pulse to input A1, A2, B1, and B2. Diode D6, D7, D8, and D9 are used as clamping diodes. Operation is very simple, apply a minimum 150mS-500mS trigger voltage to input A1/B1, this will energize relay coil -1 and the coil moves contact(s) open to close, and when the pulse applies to input A2/B2, coil-2 energized and moves the contact(s) from close to open. All inputs can be triggered using push switches, Arduino/microcontroller and other circuits, applying 150mS to 500mS TTL pulse will energize the coil.

Features

  • Supply 12V DC @ 60mA
  • 4 x Inputs to trigger Relay Contacts
  • Relay Contacts Current Load 16A Maximum
  • PCB Dimensions 54.61 x 44.45mm

Connectors

  • Connector CN1
  • Pin1: VCC 12V DC @ 40mA
  • Pin2: Relay 1 Coil-1 A1 Trigger Input
  • Pin3: Relay 1 Coil-2 A2 Trigger Input
  • Pin4: Relay 2 Coil-1 B1 Trigger Input
  • Pin5: Relay 2 Coil-2 B2 Trigger Input
  • Pin6: GND
  • Connector CN1: Relay 1 Connections Open, Common, Closed
  • Connector CN2: Relay 2 Connections Open, Common, Closed
  • LED D1, D2, D4, D5: Relay Operations
  • LED D3: Power LED

What is Latching Relay/Dual Coil Relay

Latching relays are commonly used in low-power consumption or high-temperature applications where applying coil power for a long time cannot be afforded due to power consumption or self-heating of the coil. Instead of a continuous voltage applied to the coil, they are operated with short voltage pulses instead. Latching relays change contact position when a coil voltage is applied and remain in that position even if the voltage is disconnected. (It is common to use the term SET for operating a latching relay). To reset a latching relay another voltage pulse needs to be applied to another coil.

Schematic

Parts List

NO.QNTY.REFDESC.MANUFACTURERSUPPLIERPART NO
12CN1,CN23 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1248-ND
21CN36 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5319-ND
32C1,C30.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
42C2,C410uF/16V SMD SIZE 1210 OR 1206MURATA/YAGEODIGIKEY
55D1,D2,D3,D4,D5LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
64D6,D7,D8,D91N4007 SMD DIODE INCORPDIGIKEYS1MBDITR-ND
72LS1,LS2RELAY-OMRON G5RL-K1-E-DC12OSRAMDIGIKEY
84Q1,Q2,Q3,Q4BC847AL SMD SOT223NEXPERIADIGIKEY1727-2924-2-ND
99R1,R2,R3,R4,1K 5% SMD SIZE 0804MURATA/YAGEODIGIKEY
R5,R6,R7,R8,R91K 5% SMD SIZE 0804MURATA/YAGEODIGIKEY

Connections



Gerber View

Photos

Video

G5RL-K1-E-DC12 Datasheet

en_g5rl_uk-1061771

PCB

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