The Braun Series 3 (300s, 301s, 310s) takes the Braun Series 3 21B Replacement Cassette as its shaving head; replace it every 18 months; Australian sellers list it from A$14.90 as of 26 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your electric shaver
Braun Series 3 (300s, 301s, 310s)
Electric shaver
Confirmed against Braun's listConfirmed against Braun's own compatibility list
Not yours? ChangeSave it · remind me every 18 months
Takes the 21B shaving head
Series 3 21B Replacement Cassette · replace every 18 months · check the code on your old part before ordering.
Your electric shaver
Electric shaver
Confirmed against Braun's listConfirmed against Braun's own compatibility list
Takes the 21B
Shaving head · every 18 months · check the code on your old part.
Other Braun electric shavers and their shaving heads
The 21B fits the Series 3 (300s, 301s, 310s) only. These Braun models take a different shaving head:
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.
Compare 3 listings from 1 seller
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.
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 shaving head in your Braun Series 3 (300s, 301s, 310s)
Watch the guide or follow the steps.
- 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 by
- Retail name:
- 20000330
- Retail name:
- 21B
- Retail name:
- Braun 21B
Sellers list any of these; they are the same part.
About your Braun Series 3 (300s, 301s, 310s)
Braun electric shaver — Series 3. Its shaving head is the Series 3 21B Replacement Cassette, part 21B, changed every 18 months.
Where the model number is: The four-digit type number (5793, 5795) is printed on the back of the handle, often in small print; the model number (9599cc, 8467cc) is on the box. The series name on the front narrows it down.
Fits this Braun model
Braun1 model
Common questions
- Which shaving head fits the Braun Series 3 (300s, 301s, 310s)?
- The Braun Series 3 (300s, 301s, 310s) takes the Braun Series 3 21B Replacement Cassette.
- How often should I replace the shaving head in my Braun Series 3 (300s, 301s, 310s)?
- 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 in a Braun Series 3 (300s, 301s, 310s)?
- 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 Series 3 (300s, 301s, 310s) match? . Reports go to a person, not a bot.