Phoenix Contact PSR 2901422 Safety Relay - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact PSR 2901422 is a safety relay module designed for DIN Rail mounting with 4PST contact configuration (3 Form A, 1 Form B) and 6A contact rating. This component operates at 120VAC/DC coil voltage and provides switching capability up to 250VAC/250VDC. The product is classified as Obsolete, making identification of compatible substitute components essential for system maintenance and new design implementations where legacy specifications must be maintained or functionally replaced.

Substiute Parts

2901422

Phoenix ContactIn Stock: 8562901422 Datasheet

Current PartRFQ

2700524

Phoenix ContactIn Stock: 9522700524 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Phoenix Contact PSR 2901422 is constrained by the following critical parameters:

Mandatory Compatibility Criteria:

• Manufacturer: Phoenix Contact (same family ecosystem)
• Series: PSR (product line consistency)
• Mounting Type: DIN Rail (form factor requirement)
• Contact Rating: 6 A minimum (electrical load capacity)
• Switching Voltage: 250VAC/250VDC maximum (voltage withstand capability)
• Termination Style: Screw Terminal (connection interface)

Functional Differences Permitting Substitution:

• Coil Voltage: Different voltage ratings are acceptable if system power supply can be adapted
• Contact Form: Reduced contact configurations are acceptable if circuit design accommodates fewer poles/throws
• Operating Temperature Range: Wider ranges are acceptable; narrower ranges require application verification
• Timing Parameters: Variations in operate and release times are acceptable within system response requirements

The Phoenix Contact PSR 2700524 qualifies as a substitute based on matching core parameters: identical manufacturer, series, mounting type, contact rating, switching voltage, and termination style. Functional differences exist in coil voltage (24VAC/DC vs. 120VAC/DC), contact configuration (3PST-NO vs. 4PST-3NO/1NC), and timing characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Product Status: The PSR 2901422 is Obsolete. The PSR 2700524 is Active and currently manufactured by Phoenix Contact, ensuring long-term availability and supply chain continuity.

Compliance and Certification: Both parts maintain RoHS compliance. The PSR 2700524 meets ROHS3 (current standard), while the PSR 2901422 meets the earlier RoHS standard. The substitute is REACH Affected, indicating compliance with current European chemical regulations.

Functional Substitution Feasibility: Selection of PSR 2700524 as a substitute requires verification of three system-level factors:

1. Coil Voltage Adaptation: The substitute operates at 24VAC/DC versus the original 120VAC/DC. System power supply must be capable of providing 24VAC/DC at 103 mA coil current, or external voltage conversion must be implemented.

2. Contact Configuration Reduction: The substitute provides 3PST-NO (3 Form A contacts) versus the original 4PST-3NO/1NC (3 Form A, 1 Form B). Circuit designs requiring the Form B (normally closed) contact cannot use this substitute without redesign.

3. Timing Parameter Variance: The substitute has a 150 ms operate time versus 40 ms for the original. Applications with strict response time requirements must confirm this 110 ms increase is acceptable.

Compliance Advantage: The PSR 2700524 represents a forward-compatible choice, meeting current manufacturing and environmental standards while maintaining core electrical and mechanical compatibility with the original PSR series platform.

Frequently Asked Questions (FAQ)

Q: Can PSR 2700524 directly replace PSR 2901422 in existing installations?

A: Direct replacement requires three modifications: (1) power supply must provide 24VAC/DC instead of 120VAC/DC; (2) circuit design must accommodate 3 Form A contacts instead of 3 Form A plus 1 Form B contact; (3) system timing logic must tolerate 150 ms operate time instead of 40 ms. If all three conditions are met, mechanical and electrical compatibility is established.

Q: What is the primary reason for substitution?

A: The PSR 2901422 is Obsolete and no longer manufactured. The PSR 2700524 is an Active product from the same manufacturer and series, ensuring continued availability and support.

Q: Are there packaging differences between these parts?

A: The PSR 2901422 packaging is listed as "-" (unspecified). The PSR 2700524 is supplied in Bulk packaging. Both use DIN Rail mounting, so form factor compatibility is maintained.

Q: How do the contact materials differ?

A: The PSR 2901422 uses Silver Tin Oxide (AgSnO) with Gold (Au) plating. The PSR 2700524 uses Silver Tin Oxide (AgSnO) without gold plating. Both materials are suitable for 6A switching at 250VAC/250VDC; the gold plating on the original provides enhanced corrosion resistance in certain environments.

Q: What is the coil current difference, and does it matter?

A: The PSR 2901422 draws 38 mA at 120VAC/DC (4.56W). The PSR 2700524 draws 103 mA at 24VAC/DC. The higher current at lower voltage is typical for relay design. System power supply must be sized for the substitute's 103 mA requirement.

Q: Can I use the PSR 2700524 in applications requiring the Form B contact?

A: No. The PSR 2700524 provides only 3PST-NO (3 Form A contacts). Applications requiring a normally closed contact must either use a different substitute or implement external logic to achieve the required function.

Q: Is the PSR 2700524 suitable for low-temperature applications?

A: Yes. The PSR 2700524 operates from -40°C, compared to -25°C for the PSR 2901422. This provides a 15°C advantage for cold environment applications.

Q: What does "RoHS Compliant" versus "ROHS3 Compliant" mean?

A: Both parts comply with Restriction of Hazardous Substances regulations. ROHS3 is the current standard (RoHS 2.0 recast), indicating the PSR 2700524 meets the latest environmental requirements. The PSR 2901422 meets the earlier RoHS standard.