Do DIN rail power supplies require additional mounting hardware?

DIN rail power supplies are designed for ease of installation and typically do not require additional mounting hardware for attachment to the rail itself. However, there are some considerations about mounting that depend on the specific design of the power supply and the system requirements. Below is a detailed explanation regarding the mounting hardware needed for DIN rail power supplies:

1. Basic Mounting Process of DIN Rail Power Supplies

In most cases, DIN rail power supplies are designed to be easily mounted directly onto the rail with minimal additional hardware. The mounting method is usually built into the power supply and consists of the following:

Integrated Mounting Clips

--- Built-in Clips or Brackets: Most DIN rail power supplies feature integrated mounting clips or brackets. These clips are built into the sides or back of the power supply, making it easy to snap the power supply onto the DIN rail.

--- How It Works: The clips allow the power supply to simply be pressed onto the DIN rail, and they lock the power supply in place. Once the power supply is pushed onto the rail, it typically locks into position with a click, and the power supply stays securely mounted.

--- Tool-Free Installation: The use of mounting clips means you don't need any tools to attach the power supply to the rail. This simplifies installation and allows for quick replacements or modifications.

TS35 Rail Compatibility

--- Compatibility with TS35 Rails: Most DIN rail power supplies are designed to fit TS35 DIN rails (35mm wide), which are the most common and widely used rails in industrial applications. The mounting clips are generally tailored to this rail type.

--- Mounting Depths: While the TS35 rail can come in different depths (e.g., 7.5mm or 15mm), the power supply clips are compatible with both, although larger power supplies may require a rail with a deeper profile (15mm) to ensure better stability.

2. When Additional Mounting Hardware Might Be Needed

While the clip-on mounting system is the most common and preferred method for most DIN rail power supplies, there are certain cases where additional mounting hardware may be required, depending on the specific application or power supply design:

Screws for Secure Attachment

--- Additional Fixing Screws: Some power supplies, especially larger or more robust units, may include screw holes in addition to the mounting clips. These screws provide extra security and can prevent accidental dislodging of the power supply, especially in environments with vibrations or shocks.

--- When It’s Needed: If the power supply is mounted in a mobile or high-vibration environment, securing it with screws may provide additional stability. Additionally, larger power supplies or those with higher current ratings may require extra security.

End Caps or End Plates

--- End Caps/Plates for Stability: In some cases, end caps or end plates may be used at the ends of the DIN rail to prevent equipment from sliding off or becoming misaligned.

--- Purpose: These caps also help protect the power supply and other equipment from being accidentally removed from the rail. They are often used in control panels or systems where several devices are mounted side by side and need additional security to stay in place.

Mounting Brackets for Non-Standard Installations

--- Specialized Mounting: For certain installations, such as when a DIN rail power supply needs to be mounted in a non-traditional position (e.g., horizontally or in tight spaces), additional mounting brackets or adapter plates may be required.

--- Example: If the power supply is being mounted in a non-standard orientation or if there is not enough space for the traditional snap-on installation, you may need an external bracket to hold the power supply in place securely.

3. How to Install a DIN Rail Power Supply

Here is a simple guide to installing a DIN rail power supply without the need for additional mounting hardware (unless specified by the manufacturer):

--- Choose the Right Rail: Select a TS35 DIN rail that fits the width of your power supply's mounting clips.

--- Prepare the Installation Space: Ensure the DIN rail is properly installed in a control cabinet or enclosure, with enough space for the power supply and other components.

--- Clip the Power Supply onto the Rail: Line up the mounting clips of the power supply with the DIN rail. Press the power supply onto the rail until the clips engage and lock into place. You should hear a click or feel resistance as the clips secure the unit.

--- Secure with Screws (if Needed): If your power supply includes screw holes or additional mounting features, use screws to further secure the power supply to the rail. Ensure the screws are tightened but avoid overtightening, as this could damage the unit.

--- Attach End Caps (if Necessary): If you're using end caps or end plates, install them at the ends of the rail to prevent equipment from moving or being dislodged.

--- Connect the Wiring: Once the power supply is securely mounted, you can connect the AC input (for AC to DC power supplies) and DC output (to power your equipment).

4. Power Supply Mounting Considerations

--- Vibration and Shock Resistance: If the system will be exposed to high levels of vibration, using screws or additional securing methods is recommended. Power supplies mounted only with clips may come loose over time in such conditions.

--- Environmental Protection: In some cases, if the power supply is exposed to dust, moisture, or chemicals, IP-rated enclosures or protective covers might be needed in addition to the mounting hardware to ensure the unit stays secure and protected.

--- Heat Dissipation: When mounting power supplies, make sure there is enough ventilation around the unit for proper heat dissipation. Crowding power supplies too closely together without adequate airflow could lead to overheating and potential failure.

5. Conclusion

In general, DIN rail power supplies are designed to be easy to install without requiring additional mounting hardware beyond the basic mounting clips that come integrated with the unit. However, depending on your system's needs, you may choose to add screws for extra security, end caps to prevent shifting, or mounting brackets for special installations.

The clip-on system is efficient, space-saving, and convenient, making DIN rail power supplies a popular choice for industrial applications. Always refer to the manufacturer's instructions for any specific requirements related to mounting hardware for the power supply you're using.