Is there a pin-compatible replacement for JK30-400?

RUILON's RL30-400 has the same radial leaded package and pin count, making it a potential form-fit replacement. True pin-to-pin compatibility depends on verifying that its slightly higher resistance is acceptable in your circuit.

What risks should I check before replacing JK30-400?

Key risks include changes in hold/trip current, which affects protection level, and differences in resistance, which can alter voltage drop and circuit behavior. Always verify the replacement's datasheet against your application's requirements.

JK30-400 Alternatives, Datasheet & Cross Reference | Jinrui Electronic Materials Co.

Finding a replacement for the JK30-400 PTC resettable fuse involves matching its 30V rating, 4A hold current, and radial package. Alternatives exist but require careful review of electrical parameters like resistance.

AI replacement insight

Electrical riskmedium

Resistance and trip time differences require validation.

Package risklow

Radial leaded package is standard, but check lead spacing.

Sourcing risklow

Multiple vendors produce similar PTC fuses.

Can it be replaced directly?

No confirmed drop-in replacement exists. RL30-400 is the closest candidate but requires validation due to different resistance characteristics.

Best replacement path

Evaluate RL30-400, a cross-vendor alternative with matching primary ratings, while testing for impacts from its higher resistance.

Main risk

The primary risk is electrical incompatibility, specifically the higher resistance of alternatives, which could cause unacceptable voltage drops.

Recommended alternatives

A form-fit compatible PTC fuse with matching voltage and hold/trip current, but higher resistance. Review required.

View details

Alternative comparison matrix

Feature / factor	JK30-400	RL30-400	RL30-500	Compatibility / risk
Package	Radial Leaded, 2-pin	Radial Leaded, 2-pin	Radial Leaded, 2-pin	Radial Leaded, 2-pin — Matches form and fit.; RL30-500: Matches form and fit.
Voltage	30V	30V	30V	30V — Maximum voltage rating matches.; RL30-500: Maximum voltage rating matches.
Current	8.0A	8.0A	10A	8.0A / 10A — Trip current matches.; RL30-500: Higher trip current.
Resistance	up to 60mΩ	up to 90mΩ	-	up to 90mΩ — Candidate has higher max resistance, may increase voltage drop.

Application & sourcing insights

Questions & answers

RL30-400 by RUILON is a strong functional alternative, sharing the same voltage, hold current, and package. However, its higher resistance requires engineering validation before use.