Is there a pin-compatible replacement for RL30-400?

JK30-400 is a strong candidate for a pin-compatible replacement as it shares the same radial leaded package. However, you must verify the lead spacing from the datasheet to ensure a perfect fit on your PCB.

What risks should I check before replacing RL30-400?

Before replacing, check three key things: 1) The hold current must be at least 4A, but a significantly higher value reduces protection. 2) The voltage rating must be at least 30V. 3) For cross-vendor parts, verify physical dimensions like lead spacing.

RL30-400 Alternatives, Datasheet & Cross Reference | RUILON

The RUILON RL30-400 is a PTC resettable fuse designed for reliable overcurrent protection in a wide range of electronics. It features a 30V maximum voltage and a 4A hold current in a radial leaded package.

AI replacement insight

Electrical risklow

JK30-400 matches key electrical specs. Other candidates with higher current pose a medium risk.

Package riskmedium

Cross-vendor parts like JK30-400 require verification of lead spacing and body size.

Sourcing risklow

Multiple vendors produce similar PTC fuses, offering good sourcing flexibility.

Can it be replaced directly?

Yes, JK30-400 by Jinrui is a strong candidate for replacing RL30-400, offering the same 30V voltage and 4A hold current in a similar radial package.

Best replacement path

The strongest candidate is JK30-400, which matches key electrical parameters. However, as a cross-vendor part, its physical dimensions must be verified.

Main risk

The primary risk is a mismatch in hold current. Using a fuse with a higher hold current (like RL30-500) may fail to protect the circuit under overcurrent conditions.

Recommended alternatives

A strong cross-vendor alternative with matching key electrical specs and package type.

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Alternative comparison matrix

Feature / factor	RL30-400	JK30-400	RL30-500	Compatibility / risk
Package	Radial Leaded	Radial Leaded	Radial Leaded	Radial Leaded — Same package type, but physical dimensions should be verified from datasheet.; RL30-500: Same manufacturer series and package type.
Voltage	30V	30V	30V	30V — Maximum voltage rating matches.; RL30-500: Maximum voltage rating matches.
Current	4.0A	4.0A	5.0A	4.0A / 5.0A — Hold current matches exactly.; RL30-500: Hold current is 25% higher, which reduces circuit protection sensitivity.
Power	2.5W	2.5W	3.0W	2.5W / 3.0W — Typical power dissipation matches.; RL30-500: Higher power dissipation, consistent with higher hold current.
Manufacturer	RUILON	Jinrui	-	Jinrui — Cross-vendor alternative.

Application & sourcing insights

Questions & answers

The best alternative found is JK30-400 from Jinrui Electronic Materials Co. It matches the critical 30V voltage and 4A hold current ratings of the RL30-400.