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Best Alternatives to JK250-400U

Package: Radial LeadedJinrui Electronic Materials Co.PTC Resettable FusesOperating Voltage (Max): 250VHold Current: 400mATrip Current: 800mACurrent Rating (Max): 5AMaximum Time to Trip: 3s

Finding a substitute for the JK250-400U PTC fuse requires matching its 250V rating, 400mA hold current, and radial package. The RUILON RL250-400 is a strong candidate that meets these critical parameters.

AI replacement insight

Electrical riskhigh

Using a part with the wrong hold current (e.g., RL250-600) is a high risk.

Package risklow

All PTC candidates share the same radial leaded package.

Can it be replaced directly?

Direct replacement for JK250-400U should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Select the RL250-400, which matches the critical hold current, voltage, and package. Verify the minor difference in power dissipation for your application.

Main risk

Using a substitute with a higher hold current, which will compromise the overcurrent protection designed for the circuit.

Recommended alternatives

2
RL250-400 package
RL250-400

RUILON

Needs validationlow risk

A likely pin-compatible PTC fuse with matching voltage, hold/trip current, and package.

View details

Alternative comparison matrix

Feature / factorJK250-400URL250-400RL250-600Alt 3Compatibility / risk
PackageRadial Leaded, 2-pinRadial Leaded, 2-pinRadial Leaded, 2-pinRadial Leaded, 2-pin — Form and fit are identical.; RL250-600: Form and fit are identical.
Voltage250.0V250.0V250.0V250.0V — Maximum voltage rating matches.; RL250-600: Maximum voltage rating matches.
Current800mA (Trip)800mA (Trip)600mA (Hold)800mA (Trip) / 600mA (Hold) — Trip current matches.; RL250-600: Higher hold current reduces circuit protection.
Power2.8W2.5W-2.5W — Slightly lower power dissipation; verify thermal performance.

Application & sourcing insights

Questions & answers

Verified drop-in options for JK250-400U are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.