relay - Why do designers use a series diode and zener for coil suppression rather than just a zener? - Electrical Engineering Stack Exchange
Using Flyback Diodes in Relays Prevents Electrical Noise in Your Circuits | PCB Design Blog | Altium
Can I use an IN4007 with a relay as a snubber? - Quora
HAMLIN HE721C2410 HE7X Series Single Contact SPDT 24 V Coil Suppression Diode Reed Relay - DIL-8 - 5 item(s): Amazon.com: Industrial & Scientific
Suppression Diode
Coil Transient Voltage Suppression - Functional Devices, Inc.
Component Options for Relay Coil Surge Suppression - Design Tools and Resources - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key
Why diode is mandatory in relay? - YouTube
Coil Spike suppression Diode
flyback - Can a Zener diode that protects a switch against inductance when the switch opens, affect turn on speed of the valve when you close it again? - Electrical Engineering Stack Exchange