Phoenix Contact 2904693 SSR Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2904693 is a solid-state relay (SSR) module configured as SPST-NO (Single Pole Single Throw - Normally Open) with a 1 Form A circuit. This component is designed for DIN rail mounting and operates with a 24VDC input signal to control DC loads ranging from 3V to 48V at up to 100mA. The product is classified as obsolete, making identification of suitable substitute components essential for system maintenance and new design implementations.

Substiute Parts

2904693

Phoenix ContactIn Stock: 8002904693 Datasheet

Current PartRFQ

2908172

Phoenix ContactIn Stock: 8702908172 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Phoenix Contact 2904693 is determined by the following critical parameters:

• Circuit configuration must remain SPST-NO (1 Form A)
• Output type must be DC
• Input voltage must be 24VDC
• Mounting type must be DIN Rail
• Termination style must be Spring Terminal
• Load voltage range and load current capacity define the operational envelope for the substitute

The Phoenix Contact 2908172 qualifies as a direct substitute based on matching circuit topology, input voltage, mounting configuration, and termination method. However, the load current capacity is reduced from 100mA to 3mA, and the load voltage range is narrowed from 3V~48V to 5V~30V. These parameter reductions establish a constrained substitution relationship where the 2908172 is suitable only for applications within its specified electrical limits.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2908172 is an active product with current manufacturing support and ROHS3 compliance, providing supply chain continuity for the obsolete 2904693. Selection of the 2908172 as a substitute requires validation that the application load current does not exceed 3mA and that the load voltage remains within the 5V to 30V range. Applications requiring the full 100mA capacity or extended voltage range of the original 2904693 cannot use the 2908172 without circuit redesign or alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2908172 directly replace the 2904693 in all applications?

A: No. The 2908172 has reduced electrical specifications. Direct replacement is limited to applications where load current does not exceed 3mA and load voltage remains between 5V and 30V. Applications requiring 100mA load current or voltage extremes outside this range require alternative solutions.

Q: What are the key differences between these two SSR modules?

A: Both modules share identical circuit topology (SPST-NO), input voltage (24VDC), mounting method (DIN Rail), and termination style (Spring Terminal). The primary differences are load current capacity (100mA vs. 3mA) and load voltage range (3V~48V vs. 5V~30V). The 2908172 is an active product while the 2904693 is obsolete.

Q: Are there any compliance differences between the two parts?

A: The 2904693 carries RoHS Compliant status, while the 2908172 carries ROHS3 Compliant status, indicating updated compliance with current environmental regulations. The 2908172 also carries REACH Affected designation.

Q: What should be verified before implementing the 2908172 as a substitute?

A: Confirm that the application load current requirement does not exceed 3mA and that the load voltage operates within the 5V to 30V window. Verify that the control circuit and load characteristics are compatible with these electrical constraints.

Q: Is the 2908172 suitable for new designs?

A: Yes. The 2908172 is an active product with current manufacturing support and modern compliance certifications, making it appropriate for new system designs within its specified electrical parameters.