---
title: The Electrical Engineer's Guide to Safety Capacitors
description: Learn how resonance works using a spring and mass analogy.
image: https://blog.knowlescapacitors.com/hubfs/The%20Electrical%20Engineer%E2%80%99s%20%20Guide%20to%20Safety%20Capacitors%20(1).png
---

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    - [Capacitor Overview](https://www.knowlescapacitors.com/Products/Capacitors)
    - [Aerospace & Defense](https://www.knowlescapacitors.com/Products/Capacitors/Aerospace-and-Defense)
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    - [Trimmer](http://www.knowlescapacitors.com/Products/Capacitors/Trimmer.aspx)
    - [Aluminum Capacitors](https://www.cde.com/capacitors/aluminum-electrolytic/)
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    - [Supercapacitors](https://www.cde.com/capacitors/ultracapacitors/)
- RF and Microwave 
    - [RF & Microwave Overview](https://www.knowlescapacitors.com/Products/Microwave-Products)
    - [Filter Technology](https://www.knowlescapacitors.com/Products/Microwave-Products/Filter-Technology)
    - [5G Filters](https://www.knowlescapacitors.com/Products/Microwave-Products/5G-Filters)
    - [Bandpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Bandpass-Filters.aspx)
    - [Lowpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Lowpass-Filters.aspx)
    - [Highpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Highpass-Filters.aspx)
    - [Cavity Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Cavity-Filters.aspx)
    - [Couplers](http://www.knowlescapacitors.com/Products/Microwave-Products/Couplers.aspx)
    - [High Frequency RF Crossover](https://www.knowlescapacitors.com/Products/Microwave-Products/RF-Crossover)
    - [Custom Design Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Custom-Design-Filters.aspx)
    - [Gain Equalizers](http://www.knowlescapacitors.com/Products/Microwave-Products/Gain-Equalizers.aspx)
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    - [Ceramic Resonators](https://www.knowlescapacitors.com/Products/Microwave-Products/Ceramic-Resonators)
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    - [SatCom Products](https://www.knowlescapacitors.com/Products/Microwave-Products/SatCom-Products)
    - [Self Bias Networks](http://www.knowlescapacitors.com/Products/Microwave-Products/Self-Bias-Networks.aspx)
- EMI 
    - [EMI Overview](https://www.knowlescapacitors.com/Products/EMI)
    - [EMI Filters](https://www.knowlescapacitors.com/Products/EMI/EMI-Filters)
    - [Planars and Discoidals](https://www.knowlescapacitors.com/Products/EMI/Planars-and-Discoidals)
- Non Magnetic 
    - [Non-Magnetic Overview](https://www.knowlescapacitors.com/Products/Non-magnetic-Components)
    - [Non-Magnetic Hardware](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Hardware.aspx)
    - [Non-Magnetic Inductors](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Inductors.aspx)
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- Solutions 
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    - [Military and Defense](https://info.knowlescapacitors.com/rf-and-microwave-components-for-military-and-defense)
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    - [SatCom Products](https://www.knowlescapacitors.com/Solutions/SatCom-Products)
    - [High Reliability for Medical](https://info.knowlescapacitors.com/high-reliability-capacitors-medical-implantable)
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- Capacitors 
    - [Capacitor Overview](https://www.knowlescapacitors.com/Products/Capacitors)
    - [Aerospace & Defense](https://www.knowlescapacitors.com/Products/Capacitors/Aerospace-and-Defense)
    - [High Q](https://www.knowlescapacitors.com/Products/Capacitors/High-Q)
    - [SMD Capacitors](http://www.knowlescapacitors.com/Products/Capacitors/SMDCap.aspx)
    - [MLCCs with Leads](http://www.knowlescapacitors.com/Products/Capacitors/Leaded-MLC-s.aspx)
    - [Single Layer Capacitor](http://www.knowlescapacitors.com/Products/Capacitors/Single-Layer-Capacitor.aspx)
    - [AEC-Q200](http://www.knowlescapacitors.com/Products/Capacitors/AEC-Q200.aspx)
    - [Broadband Blocks](http://www.knowlescapacitors.com/Products/Capacitors/Broadband-Blocks.aspx)
    - [Capacitor Assemblies](http://www.knowlescapacitors.com/Products/Capacitors/CAP-Assemblies.aspx)
    - [Trimmer](http://www.knowlescapacitors.com/Products/Capacitors/Trimmer.aspx)
    - [Aluminum Capacitors](https://www.cde.com/capacitors/aluminum-electrolytic/)
    - [Film Capacitors](https://www.cde.com/capacitors/film-paper-film-capacitors/)
    - [Supercapacitors](https://www.cde.com/capacitors/ultracapacitors/)
- RF and Microwave 
    - [RF & Microwave Overview](https://www.knowlescapacitors.com/Products/Microwave-Products)
    - [Filter Technology](https://www.knowlescapacitors.com/Products/Microwave-Products/Filter-Technology)
    - [5G Filters](https://www.knowlescapacitors.com/Products/Microwave-Products/5G-Filters)
    - [Bandpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Bandpass-Filters.aspx)
    - [Lowpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Lowpass-Filters.aspx)
    - [Highpass Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Highpass-Filters.aspx)
    - [Cavity Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Cavity-Filters.aspx)
    - [Couplers](http://www.knowlescapacitors.com/Products/Microwave-Products/Couplers.aspx)
    - [Custom Design Filters](http://www.knowlescapacitors.com/Products/Microwave-Products/Custom-Design-Filters.aspx)
    - [Gain Equalizers](http://www.knowlescapacitors.com/Products/Microwave-Products/Gain-Equalizers.aspx)
    - [Power Dividers](http://www.knowlescapacitors.com/Products/Microwave-Products/Power-Dividers.aspx)
    - [Resonators](http://www.knowlescapacitors.com/Products/Microwave-Products/Resonatros.aspx)
    - [Ceramic Resonators](https://www.knowlescapacitors.com/Products/Microwave-Products/Ceramic-Resonators)
    - [Bias Filter Networks](http://www.knowlescapacitors.com/Products/Microwave-Products/Bias-Filter-Networks.aspx)
    - [SatCom Products](https://www.knowlescapacitors.com/Products/Microwave-Products/SatCom-Products)
    - [Self Bias Networks](http://www.knowlescapacitors.com/Products/Microwave-Products/Self-Bias-Networks.aspx)
- EMI 
    - [EMI Overview](https://www.knowlescapacitors.com/Products/EMI)
    - [EMI Filters](https://www.knowlescapacitors.com/Products/EMI/EMI-Filters)
    - [Planars and Discoidals](https://www.knowlescapacitors.com/Products/EMI/Planars-and-Discoidals)
- Non Magnetic 
    - [Non-Magnetic Overview](https://www.knowlescapacitors.com/Products/Non-magnetic-Components)
    - [Non-Magnetic Hardware](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Hardware.aspx)
    - [Non-Magnetic Inductors](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Inductors.aspx)
    - [Non-Magnetic MLC's](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Non-Magnetic.aspx)
    - [Non-Magnetic Trimmers](http://www.knowlescapacitors.com/Products/Non-magnetic-Components/Trimmers.aspx)
- Thin Film and Substrates 
    - [Heatsinks, Standoffs & Submounts](https://www.knowlescapacitors.com/Products/Thin-Film-and-Substrates/Heatsinks-Standoffs)
    - [Mounting Shorts](https://www.knowlescapacitors.com/Products/Thin-Film-and-Substrates/Mounting-Shorts)
    - [Submounts](https://www.knowlescapacitors.com/Products/Thin-Film-and-Substrates/Submounts)
    - [Build to Print](https://www.knowlescapacitors.com/Products/Thin-Film-and-Substrates/Build-To-Print)
    - [Substrates](http://www.knowlescapacitors.com/Products/Thin-Film-and-Substrates/Substrates.aspx)
- Solutions 
    - [Inductors & Baluns](https://info.knowlescapacitors.com/inductors-and-baluns)
    - [Military and Defense](https://info.knowlescapacitors.com/rf-and-microwave-components-for-military-and-defense)
    - [mmWave for 5G](https://info.knowlescapacitors.com/knowles-precision-devices-5g-filter-solutions)
    - [SatCom Products](https://www.knowlescapacitors.com/Solutions/SatCom-Products)
    - [High Reliability for Medical](https://info.knowlescapacitors.com/high-reliability-capacitors-medical-implantable)
    - [High Voltage for Electric Vehicles](https://info.knowlescapacitors.com/knowles-precision-devices-capacitors-for-electric-vehicles)
- [Contact](http://www.knowlescapacitors.com/Contact.aspx)
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    - [Filter Basics](https://info.knowlescapacitors.com/filter-basics)
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## Knowles Precision Devices Blog

# The Electrical Engineer's Guide to Safety Capacitors

Posted by [Peter Matthews](https://blog.knowlescapacitors.com/blog/author/peter-matthews) on Oct 22, 2025 8:00:01 AM

![Peter Matthews](https://blog.knowlescapacitors.com/hubfs/Peter.png)

- [Tweet](https://twitter.com/share)

In high-voltage, high-reliability applications, safety is non-negotiable. That’s why safety capacitors are essential for mitigating the risks associated with transient voltages and electrical interference. 

![The Electrical Engineer’s  Guide to Safety Capacitors (1)](https://blog.knowlescapacitors.com/hs-fs/hubfs/The%20Electrical%20Engineer%E2%80%99s%20%20Guide%20to%20Safety%20Capacitors%20(1).webp?width=750&height=392&name=The%20Electrical%20Engineer%E2%80%99s%20%20Guide%20to%20Safety%20Capacitors%20(1).webp)

Our latest eBook, [The Electrical Engineer's Guide to Safety Capacitors,](https://info.knowlescapacitors.com/the-electrical-engineers-guide-to-safety-capacitors) provides in-depth guidance on the role, classification, and selection of safety capacitors, ensuring you can make confident design choices that protect both users and equipment.

#### What You’ll Learn:

- The role safety capacitors play in a circuit
- The different classes and subclasses safety capacitors are divided into
- Dielectric material selection considerations for your application
- How to select the appropriate safety capacitor for EMI filtering in the power factor correction (PFC) stage of an AC/DC converter
- The broad range of safety capacitor options from Knowles, including our newly expanded portfolio of enhanced safety-certified multilayer ceramic capacitors (MLCCs) 

Download [The Electrical Engineer’s Guide to Safety Capacitors](https://info.knowlescapacitors.com/the-electrical-engineers-guide-to-safety-capacitors) to learn more. 

Need help selecting the right capacitors for your application? [Our team is ready to assist](https://www.knowles.com/about-knowles/about/doing-business-with-knowles). 

 

 Topics: [Capacitor](https://blog.knowlescapacitors.com/blog/tag/capacitor), [Industrial](https://blog.knowlescapacitors.com/blog/tag/industrial)

## Insights Into Precision Passive Devices

Knowles Precision Devices is a premier global source for Capacitors, RF Filters, EMI Filters, Resonators, non-magnetic components and advanced dielectric materials. An umbrella for the brands of **Compex**, **DLI**, **Johanson MFG**, **Novacap**, **Syfer** and **Voltronics**, Knowles Precision Devices serves a variety of markets including military, aerospace/avionics, medical equipment, implantable devices, EMI and connector filtering, oil exploration, instrumentation, industrial electronics, automotive, telecoms and data networks.

This Blog will provide insights into:

- Filters for 5G and mmWave
- Capacitors for High Voltage
- Capacitors for High Reliability

and much more. Subscribe below to stay informed.

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