RP438024 General Purpose Relay SPST 24VDC Equivalent & Substitute Parts

Part Overview

The RP438024 is a general purpose relay manufactured by TE Connectivity Potter & Brumfield Relays, configured as a Single Pole Single Throw Normally Open (SPST-NO) contact form with a 24VDC coil. This relay is rated for 12A continuous contact current at 400VAC maximum switching voltage and features sealed flux protection with through-hole PC pin termination.

The RP438024 is classified as obsolete. Identification of equivalent and substitute parts is necessary to maintain system functionality and ensure continued availability for replacement and new design applications.

Substiute Parts

RP438024

TE Connectivity Potter & Brumfield RelaysIn Stock: 850RP438024 Datasheet

Current PartRFQ

RP3SL024

TE Connectivity Potter & Brumfield RelaysIn Stock: 2486RP3SL024 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RP438024 is determined by the following critical parameters that must remain constant or compatible:

Mandatory Matching Parameters:

• Coil Voltage: 24VDC
• Contact Form: SPST-NO (1 Form A)
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching
• Operating Temperature Range: -40°C ~ 70°C

Allowable Variation Parameters:

• Contact Rating (Current): Substitute must equal or exceed 12A
• Coil Current: Must remain within acceptable driver circuit limits (21.8 mA nominal)
• Coil Resistance: Must remain at 1.1 kOhms to maintain coil drive compatibility
• Switching Voltage: Must support 400VAC or higher
• Seal Rating: Must maintain sealed flux protection

The RP3SL024 satisfies all mandatory matching parameters and provides enhanced contact current rating (16A versus 12A), making it a direct substitute for the obsolete RP438024.

Parameter Comparison

Engineering Selection Recommendations

The RP3SL024 is the direct substitute for the obsolete RP438024 based on the following engineering criteria:

Product Status and Availability: The RP438024 is obsolete with no ongoing manufacturing. The RP3SL024 is actively produced by TE Connectivity Potter & Brumfield Relays, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both relays share identical coil voltage (24VDC), coil current (21.8 mA), coil resistance (1.1 kOhms), and contact form (SPST-NO). The RP3SL024 provides a higher contact current rating (16A versus 12A), which is compatible with applications designed for the 12A RP438024 and provides additional margin for higher-current applications.

Mechanical Compatibility: Both relays feature identical through-hole mounting and PC pin termination, allowing direct board-level substitution without layout modifications.

Compliance and Certifications: The RP3SL024 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The RP438024 compliance status is not fully specified in available documentation.

Performance Considerations: The RP3SL024 exhibits longer operate time (14 ms versus 8 ms) and release time (12 ms versus 2 ms), and requires a higher must-operate voltage (18 VDC versus 16.8 VDC). These differences must be evaluated against specific application timing and voltage supply requirements. The RP3SL024 uses Silver Tin Oxide (AgSnO) contact material compared to the Silver Cadmium Oxide (AgCdO) of the RP438024, reflecting modern contact material standards.

Frequently Asked Questions (FAQ)

Q: Can the RP3SL024 directly replace the RP438024 in existing designs?

A: The RP3SL024 is electrically and mechanically compatible with the RP438024 for applications requiring 12A or less contact current. However, the longer operate and release times (14 ms and 12 ms respectively, versus 8 ms and 2 ms) must be evaluated against application timing requirements. The higher must-operate voltage (18 VDC versus 16.8 VDC) requires verification that the 24VDC supply can reliably exceed this threshold under worst-case conditions.

Q: What is the difference in contact material between these relays?

A: The RP438024 uses Silver Cadmium Oxide (AgCdO) contact material, while the RP3SL024 uses Silver Tin Oxide (AgSnO). Both materials are suitable for general-purpose switching applications at the specified voltage and current ratings. The AgSnO material in the RP3SL024 reflects current manufacturing standards and environmental compliance requirements.

Q: Are there packaging differences between these relays?

A: The RP438024 is supplied with unspecified packaging, while the RP3SL024 is supplied in tube packaging. Both relays use identical through-hole PC pin termination and mounting footprint, so packaging differences do not affect board-level compatibility.

Q: What is the current rating difference, and does it affect substitution?

A: The RP438024 is rated for 12A continuous contact current, while the RP3SL024 is rated for 16A. The higher rating of the RP3SL024 is compatible with applications designed for the 12A relay and provides additional current-handling capacity. Applications requiring exactly 12A operation are not negatively affected by the higher rating.

Q: How do the coil drive requirements compare?

A: Both relays require identical coil current (21.8 mA) and coil resistance (1.1 kOhms) at 24VDC. Existing driver circuits designed for the RP438024 are directly compatible with the RP3SL024 without modification.

Q: What compliance certifications apply to the RP3SL024?

A: The RP3SL024 is ROHS3 compliant and REACH unaffected, meeting current European and international regulatory requirements for electronic components. The RP438024 compliance status is not fully documented in available specifications.