The scenario
An industrial PLC output module drives a relay coil from a 60V SMPS. The design shows a flyback diode and RC snubber across the coil to clamp turn-off transients before they damage the switching MOSFET.
What is in this drawing
Read the decisions behind it.
01
Flyback diode D1 placed anti-parallel across relay coil
02
Series RC snubber (R1 + C1) across coil to damp ringing
03
Low-side N-MOSFET M1 switches coil to V− rail
04
V+ / V− rails labeled from 60V SMPS
Use when designing or documenting DC relay coil suppression in PLC outputs, industrial controls, or any low-side switched inductive load.
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