How do I fit the 21B?

No tools, a few minutes: 3 steps, listed on this page with the replacement video where the maker has one.

What happens if I don't change it?

Blunt cutters pull at the hair instead of cutting it, the shave gets rougher and slower, and a worn foil can nick the skin.

Electric shaver shaving head

Braun Series 3 21B Replacement Cassette

21B

Fits 1 model · replace every 18 months

Wrong part, or your model missing? Tell us. A person checks every report.

GenuineGenuine Braun

$34.20

Amazon AU · 26 OctLowest genuine · Amazon AU · checked 26 Oct

CompatibleCompatible option

$14.90

Amazon AU · 26 OctAmazon AU · checked 26 Oct

Check sellerCheck seller details

Genuine: made by Braun. Compatible: another brand.Genuine is made by Braun. Compatible is made by another brand. Check the seller's page for the size and models it fits.

Lowest compatibleLowest compatible price · $14.90

Amazon AU. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.

Open Amazon AU · $14.90

Compare 3 listings from 1 seller

AUD, before delivery. Each price shows when it was checked.

Compatible options

1 seller

Amazon AUCompatible · checked 26 OctCompatible · Lowest compatiblechecked 26 Oct$14.90OpenGo to seller

Genuine Braun

2 listings from 1 seller

Amazon AUGenuine · checked 26 OctGenuine part · Lowest genuinechecked 26 Oct$34.20OpenGo to seller

Amazon AUGenuine · checked 26 OctGenuine partchecked 26 Oct$36.90OpenGo to seller

Open cheapest seller · $14.90

Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.

How long it lasts

Usually every 18 months (or sooner when the shaver's replacement light comes on).

Not due yet?

Get a nudge when your shaving head is due — it's every 18 months. One email two weeks before, no newsletter. Manage or stop it anytime.

How to change the 21B shaving head

Watch the guide or follow the steps.

Braun Series 3 Electric Shaver Replacement Head - 21B - Compatible with Electric Razors 300s, 310s · DVM NEWS

1Press the cassette release button(s) on the shaver head and lift the old cassette off.
2Push the new cassette on until it clicks into place.
3Braun recommends a new cassette every 18 months.

Every number this part goes by20000330 · 21B · Braun 21B

Retail name:: 20000330
Retail name:: 21B
Retail name:: Braun 21B

Sellers list any of these; they are the same part.

Will it fit your appliance?

Type your model number and we'll check it against the makers' lists.

Your appliance model

Fits this Braun modelSeries 3 (300s, 301s, 310s)

Braun1 model

Series 3 (300s, 301s, 310s)

Common questionsWhat does the 21B fit? · How often should I replace the 21B? · Where can I buy the 21B in Australia?

What does the 21B fit?: The Braun Series 3 21B Replacement Cassette fits the Braun Series 3 (300s, 301s, 310s).
How often should I replace the 21B?: Every 18 months, or sooner if it looks worn.
Where can I buy the 21B in Australia?: We track 1 Australian seller for the 21B; the lowest listed price when we last checked was A$14.90 at Amazon AU. Prices are re-checked daily and dated on this page.
How do I fit the 21B?: No tools, a few minutes: 3 steps, listed on this page with the replacement video where the maker has one.
What happens if I don't change it?: Blunt cutters pull at the hair instead of cutting it, the shave gets rougher and slower, and a worn foil can nick the skin.

Something looks wrong with the 21B match? . Reports go to a person, not a bot.