Description
This is a pack of 5 surface mount polyfuses. A polyfuse "trips" by heaing up and shutting down the current. Remove current and allow it to cool and it's back in operation again.
Note that this means (like any other fuse, but a bit more pronounced) that the trip current is not absolute, for example a 500mA version will trip in milliseconds with 8A, but might take 15 seconds for 1A. I've added an image from a datasheet showing time-to-trip.
Currently I have the following packs available.
500mA Hold Current, 1812 Size (4.5mm x 3.2mm)
Like most my parts, these are sourced from no-name chinese vendors, the exact model, manufacturer or part numbers, even if the Chinese vendor specified, are uncertain and depends on what I get sent. For what it's worth, the green ones look like miniSMD050F and the gold ones look like MF-MSMF050, you can google for datasheets if you really want.
See all my listings: https://tinyurl.com/26tzbx6d
Details
Shipping & pick-up options
| Destination & description | Price | |
|---|---|---|
| Nationwide 1-2 days, Express Urban | $5.70 | |
| Nationwide 2-4 days, Rural | $11.70 | |
| Nationwide 5-8 days, Economy | $3.60 | |
| Combine with another item you've paid shipping on | $0.00 | |
| Shipping more than one item | No extra charge | |
Estimated delivery times in business days
Seller does not allow pick-ups
Payment Options
Pay instantly by card and Ping balance.
Four fortnightly interest-free payments.
Questions & Answers (4)
ECONOMY SHIPPING: This item has an Economy Shipping option. This means an UNTRACKED LETTER POST. If you plan to combine items into this parcel you need to choose Express Urban or Rural we can not combine items into Economy! Only very tiny items can be sent Economy they all have to fit in a flat envelope 10mm thick! Seller comment Monday, 20 April 2026 FAQs: All stock is in Christchurch. Express Urban and Rural Standard is with Courier Post (NZ Post Courier), PO Box welcome. Pickup is not possible sorry. Tracking and GST Invoice links are emailed when shipped - CHECK YOUR SPAM. Combined shipping means you pay shipping on one item, and choose "Combine with another" on the rest. Seller comment Monday, 20 April 2026 HOW TO SAVE WITH COMBINED SHIPPING: Use the Trade Me cart or purchase each separately - choose Urban or Rural shipping option (not Economy) on one item, and choose "Combine with another" on the rest - NO LIMIT! Seller comment Monday, 20 April 2026 RURAL DELIVERY: Rural dwellers, if you have a Woolworths or NZ Post nearby did you know you can use a Parcel Collect address with NZ Post so you only have to pay urban shipping? Google NZ Post Parcel Collect to register. Seller comment Monday, 20 April 2026
(5 of) Surface Mount 500mA Polyfuse (Self Reset Fuse)
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