RUEF600K-AP Equivalent & Substitute Parts

Part Overview

The RUEF600K-AP is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, part of the PolySwitch® RUEF series. This component provides overcurrent protection with automatic reset capability in through-hole radial configuration. The device is rated for 30V maximum voltage with 6A hold current and 12A trip current. As an active product with full compliance certifications (CQC, CSA, TUV, UL), it remains in production. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component sourcing flexibility and inventory management.

Substiute Parts

RUEF600K-AP

LittelfuseIn Stock: 1897RUEF600K-AP Datasheet

Current PartRFQ

RUEF600-AP

LittelfuseIn Stock: 1260RUEF600-AP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RUEF600K-AP is determined by strict equivalence across the following critical parameters:

• Voltage rating (30V maximum)
• Current hold specification (6A Ih maximum)
• Current trip specification (12A It)
• Resistance characteristics (5 mOhms initial, 40 mOhms post-trip maximum)
• Operating temperature range (-40°C to 85°C)
• Mounting configuration (Through Hole, Radial, Disc package)
• Lead spacing (0.400" / 10.15mm)
• Compliance certifications (CQC, CSA, TUV, UL)
• RoHS3 compliance status

Parts meeting all these criteria are classified as direct substitutes within the PolySwitch® RUEF series.

Parameter Comparison

Engineering Selection Recommendations

Both RUEF600K-AP and RUEF600-AP are active products from Littelfuse with identical electrical and mechanical specifications. Selection between these parts is based on availability and inventory status. Both components carry full compliance certifications (CQC, CSA, TUV, UL) and meet ROHS3 requirements, confirming suitability for regulated applications. The minor difference in seated height (RUEF600K-AP: 1.032" vs. RUEF600-AP: 0.949") does not affect electrical performance or circuit board compatibility in standard through-hole applications. Component selection should prioritize availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can RUEF600-AP directly replace RUEF600K-AP in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 30V voltage rating, 6A hold current, 12A trip current, identical resistance characteristics, and matching lead spacing. Both are certified by CQC, CSA, TUV, and UL.

Q: What is the significance of the part number suffix difference (K vs. no suffix)?

A: The suffix variation does not indicate a functional difference in electrical performance or protection characteristics. Both variants maintain identical specifications for voltage, current, resistance, and operating temperature range.

Q: Are there any PCB layout considerations when substituting between these parts?

A: Both parts use identical lead spacing (0.400" / 10.15mm) and radial disc package configuration. PCB footprints are compatible. The seated height difference (1.032" vs. 0.949") is negligible for standard through-hole mounting and does not require layout modification.

Q: Do both parts meet the same compliance standards?

A: Yes. RUEF600K-AP and RUEF600-AP both carry CQC, CSA, TUV, and UL certifications and are ROHS3 compliant, meeting identical regulatory requirements.

Q: Which part should be selected based on availability?

A: Selection should be based on current inventory status and procurement lead times. Both parts are active products with equivalent performance and compliance profiles.