How to Choose the Right Relays for CNC Machine Controls

28.00 $
Published date: 2025/10/08
  • Location: 27135-350, Rogue River, Connecticut, United States

When choosing relays for CNC machine controls it is critical to ensure the relay meets the load demands. First, assess the power specifications of the connected loads. CNC machines commonly operate inductive loads like pumps and valves, so the relay must withstand inrush currents and sustained loads without thermal runaway.

Consider carefully the type of connected device. Inductive loads such as motors and solenoids can produce damaging voltage spikes when de-energized, leading to deterioration of relay contacts. To prevent damage, select models with onboard transient protection or install additional safeguards such as Zener diodes and MOVs.

When switching heating elements, standard relays are often adequate, but ensure that the load handling capability is well above the rated load.

Switching frequency is a vital factor. CNC systems frequently cycle relays, so select relays rated for high mechanical and electrical endurance.

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