Skip to main content

Select preferred language from 'Translate' hidden side menu =>

Blog Navigation

By
                              Blog Navigation 
Post a Comment

What are snubbers used for?

Image
By

How Do Snubber Circuits Protect Relay Contacts? Working Principle, Benefits, and Design Tips. Explained the Snubber analogy with a shock absorber. 

What is 'Snubber'?

RC Snubber




Snubber Circuit:

A snubber circuit is a combination of a resistor and a capacitor.

RC Snubber


Affiliate link


Why switch contact wears out that controls the inductive load?

Relay contacts tend to wear out more if it is used to switch an inductive load.

When the relay contact opens, the falling magnetic field generates a high voltage spike that results in a spark across the relay contact.

Sparking across relay contact due to inductive load

A snubber is connected in parallel to the contact. The snubber absorbs the voltage spike. The resistor dissipates the energy stored in the capacitor when the contact closes.

Analogy of Snubber: 

A Snubber can be compared with the shock absorbers of a car. A spring acts like a capacitor that absorbs shock by compressing, and a damper acts like a resistor that dissipates energy stored in the spring into heat. Both in combination absorb shocks.

Analogy of Snubber RC Circuit with Shock Absorber

FAQ Set:

Q1: What is a snubber circuit?

A snubber circuit is an electronic circuit designed to suppress voltage spikes and transient currents, protecting sensitive components like relay contacts and semiconductors.

Q2: How does a snubber protect relay contacts?

It absorbs the energy generated by inductive loads during switching, reducing arcing and contact erosion.

Q3: What are the common types of snubber circuits?

RC (Resistor-Capacitor) snubbers and diode snubbers are most commonly used for AC and DC relay protection, respectively.

Q4: Can every relay benefit from a snubber circuit?

Yes, especially relays switching inductive loads such as motors, solenoids, and transformers, where voltage spikes are significant.

Q5: How do I design an effective snubber circuit?

Choose appropriate resistor and capacitor values based on the relay voltage, load type, and desired suppression efficiency.

You may want to click on the following:

If you like my answer, consider supporting us:
Gpay link

Comments

Post a Comment

Popular Posts

Blog Navigation

By
                              Blog Navigation 
Post a Comment
Read more

Why does AC current change direction?

By
Why Does AC Current Reverse Direction Periodically? Understanding Alternating Current generation, Frequency, and Working Principle of an AC generator The answer to this question goes back to the generator where AC power is generated. A simple voltage generator:  Imagine a simple loop of coil is rotating between the two strong magnetic bars. 0 to 180 degrees,i.e. Half rotation. You will notice that when the coil is perpendicular to the magnetic field, its output is minimum or zero due to the minimum linkage of the magnetic field. But as the coil rotates to become parallel to the magnetic field, its output increases and becomes maximum when it is parallel. 180 to 360 degrees, i.e. Full rotation. The same cycle repeats, but now the voltage is negative. The following diagram explains it. Hence, as the AC voltage reverses its polarity periodically, the load current will also change direction of flow periodically. AC current direction: FAQ Set: Q1: Why does AC current reverse direction p...
Post a Comment
Read more

Why are transformers rated in VA and not watts?

By
Why Is Transformer Rating Given in VA? Understanding Power in Volt-Ampere versus watts, Power Factor, and Transformer Efficiency related to inductive load Real reason: Because the manufacturer of the transformer never knows where it is going to be used. Suppose a transformer of 100KVA feeds a resistive load; it will develop 100 kilowatts of power across the load because the power factor of the resistive load is unity. If the same transformer feeds an inductive load of power factor 0.5, then it will develop only 50 kilowatts of power across the load. Hence, if I want to rate a transformer in watts, then I need to know the power factor of the load, which is impossible. So, the transformer is rated in VA, KVA or MVA. A mug of beer analogy of Power Factor: FAQ Set: Q1: Why is transformer rating given in VA instead of watts? Transformer ratings are given in   VA (volt-amperes)   because transformers must handle   apparent power , which includes both real power (watts) and reac...
Post a Comment
Read more