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Home > Products > Circuit Protection > PTC Resettable Fuses > BK30-800-SZ
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BK30-800-SZ

In Stock 130743 pcs Reference Price(In US Dollars)
5+
$0.1719
50+
$0.1681
150+
$0.1655
500+
$0.163
Manufacturer Part Number:
BK30-800-SZ
Manufacturer / Brand
YAGEO
Part of Description:
PPTC,SQUARE 23.5MM, 30V 8A
Datasheets:
BK30-800-SZ.pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 130743 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number BK30-800-SZ
Manufacturer / Brand YAGEO
Stock Quantity 130743 pcs Stock
Category Circuit Protection > PTC Resettable Fuses
Description PPTC,SQUARE 23.5MM, 30V 8A
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Max 30V
Type Polymeric
Time to Trip 18.8 s
Thickness (Max) -
Size / Dimension 0.925" L x 0.122" W (23.50mm x 3.10mm)
Series BK30
Resistance - Post Trip (R1) (Max) 25 mOhms
Resistance - Initial (Ri) (Min) 5 mOhms
Ratings -
Package / Case Radial, Disc
Package Bulk
Operating Temperature -40°C ~ 85°C
Mounting Type Through Hole
Lead Spacing 0.413" (10.50mm)
Height - Seated (Max) 1.220" (31.00mm)
Current - Trip (It) 16 A
Current - Max 40 A
Current - Hold (Ih) (Max) 8 A
Approval Agency UL

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

PayPal:

PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: Info@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can BK30-800-SZ be used to protect a 24V industrial DC rail with startup inrush from motors, relays, or capacitive loads?
BK30-800-SZ is often a workable choice for 24V DC rails because its maximum voltage rating is 30V, but the load profile needs to stay within its thermal behavior. In a design with motor starts, relay pull-in, or large input capacitors, BK30-800-SZ can nuisance-trip if the steady-state current is close to its 8 A hold current or if repeated inrush events occur before it fully cools. For this reason, engineers usually validate BK30-800-SZ at the worst-case ambient temperature, startup repetition rate, and harness resistance before committing it to production.
How do I decide between BK30-800-SZ and a conventional one-time fuse for my power input stage?
BK30-800-SZ is a resettable polymeric PTC, so it behaves differently from a one-time fuse. After a fault, BK30-800-SZ increases resistance and limits current, then returns toward its low-resistance state when power is removed and the device cools. That makes BK30-800-SZ useful in equipment where service access is limited or where repeated overcurrent events may occur. A conventional fuse may be a better fit when the design needs a more defined open-circuit response, lower post-fault leakage, or compliance with a protection scheme that assumes permanent disconnection.
What PCB footprint and mechanical checks should I make before replacing an existing radial PPTC with BK30-800-SZ?
BK30-800-SZ uses a through-hole radial disc package with a 23.50 mm body length and 10.50 mm lead spacing, so the footprint should be checked against both hole pattern and assembly clearance. The seated height can reach 31.00 mm, which matters in compact enclosures and when the part is mounted near covers, heatsinks, or airflow paths. If you are replacing another radial PPTC, verify not only lead spacing but also body diameter, allowable lead forming, and creepage/clearance around adjacent copper.
Is BK30-800-SZ suitable for battery packs, charger outputs, or other low-voltage power subsystems?
BK30-800-SZ can fit many low-voltage protection points in battery-powered or charger-fed equipment as long as the circuit stays below 30 V and the normal load current is comfortably below 8 A. It is commonly used where resettable overcurrent protection is preferred over replacing a fuse after every fault. In battery applications, BK30-800-SZ should be evaluated together with the battery management system, because a PPTC does not replace cell-level protection, short-circuit cutoff, or thermal monitoring.
What changes in performance should I expect from BK30-800-SZ at high ambient temperature?
BK30-800-SZ is rated for operation from -40°C to 85°C, but its effective trip margin changes with ambient temperature because polymeric PTC devices self-heat. As ambient temperature rises, the available headroom above the 8 A hold current becomes smaller, so a load that is stable at room temperature may trip earlier in a warm enclosure. If BK30-800-SZ is mounted near a power resistor, regulator, transformer, or hot connector, engineers usually validate it at the worst-case ambient and with the enclosure fully closed.
Can BK30-800-SZ replace an 8 A fuse directly in an existing design?
BK30-800-SZ can replace an 8 A fuse only if the system can tolerate resettable behavior, higher post-trip resistance, and a slower fault response than a one-time fuse. Its trip current and trip time are part of a thermal process, so it does not clear faults in the same way as a fast-blow or time-delay fuse. BK30-800-SZ is a better match when the goal is current limiting and automatic recovery, while a fuse is usually selected when the design needs a permanent open after an overcurrent event.
How should BK30-800-SZ be used with inductive loads, solenoids, or large input capacitors?
BK30-800-SZ can protect inductive or capacitive loads, but the transient current must be checked carefully. Solenoid pull-in, DC motor starting, and capacitor charging can all create current pulses that are much higher than the normal operating current, and repeated pulses may drive BK30-800-SZ into a tripped state even when the average load seems acceptable. If the application has frequent starts or long cable runs, it is common to compare the startup waveform against the 8 A hold current and the 16 A trip current before finalizing BK30-800-SZ.
Is BK30-800-SZ appropriate for AC mains protection or higher-voltage industrial inputs?
BK30-800-SZ is not a good fit for AC mains protection because its maximum voltage rating is 30 V. For mains-connected equipment, engineers generally select protection devices specifically rated for line voltages, fault energy, and the relevant safety standards. BK30-800-SZ is intended for low-voltage circuits such as 12 V, 24 V, and similar power domains where its voltage and current ratings match the system.
What should I verify if BK30-800-SZ will be used in equipment that must keep operating after a fault clears?
BK30-800-SZ is useful in equipment that benefits from automatic recovery, but the circuit must tolerate the temporary resistance increase during a trip event. After a fault, the part can remain in a high-resistance state until it cools, which may reduce supply voltage to downstream electronics and can cause brownout or reboot behavior. For BK30-800-SZ, it is common to check whether the downstream regulator, DC/DC converter, or controller can ride through the fault-limited condition without entering an unstable state.
What should I compare when sourcing BK30-800-SZ as an alternative to another brand’s 30 V, 8 A PPTC?
When evaluating BK30-800-SZ against another brand’s 30 V, 8 A PPTC, compare more than just the hold current. Useful checks include initial resistance, post-trip resistance, trip time at the intended fault current, body size, lead spacing, and temperature derating. Two parts with similar 8 A markings can behave differently in startup surges or warm enclosures, so BK30-800-SZ should be matched against the actual load waveform and the board layout rather than only the headline current rating.

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BK30-800-SZ

YAGEO

PPTC,SQUARE 23.5MM, 30V 8A

In Stock: 130743

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