Phoenix Contact 2903351 Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903351 is a general purpose relay with SPDT (Single Pole Double Throw) contact configuration, designed for DIN rail mounting. This relay operates at 230VAC coil voltage with a 50mA contact rating and includes integrated features such as a lighted indicator, socket, and varistor protection. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component procurement.

Substiute Parts

2903351

Phoenix ContactIn Stock: 8072903351 Datasheet

Current PartRFQ

2903343

Phoenix ContactIn Stock: 11642903343 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Phoenix Contact 2903351 is determined by the following critical parameters:

• Coil Voltage: 230VAC (must match exactly for direct circuit compatibility)
• Mounting Type: DIN Rail (physical form factor requirement)
• Contact Rating: 50 mA minimum (electrical load capacity)
• Switching Voltage: 30VAC, 36VDC maximum (signal level compatibility)
• Coil Current: 6 mA (power supply dimensioning)
• Termination Style: Screw Terminal (connection interface)
• Operating Temperature Range: -40°C ~ 50°C (environmental tolerance)
• Contact Material: Silver Nickel (AgNi) (contact reliability and performance)

The Phoenix Contact 2903343 meets all critical substitution parameters. While the 2903343 features a DPDT (Double Pole Double Throw) contact configuration compared to the SPDT configuration of the 2903351, both relays share identical electrical specifications for coil voltage, current ratings, switching voltage, operating temperature, and contact material. The DPDT configuration provides additional switching capability and represents a functional upgrade path for applications requiring expanded contact arrangements.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903343 is the qualified substitute for the obsolete 2903351. Both relays maintain identical electrical and mechanical specifications across all critical parameters including coil voltage, current ratings, switching voltage, operating temperature range, and contact material composition.

The 2903343 offers the advantage of active product status, ensuring continued availability and supply chain reliability. The ROHS3 compliance certification of the 2903343 exceeds the RoHS compliance of the 2903351, providing enhanced environmental and regulatory alignment with current manufacturing standards.

The primary functional difference is the contact configuration: the 2903343 provides DPDT (2 Form C) switching capability versus the SPDT (1 Form C) configuration of the 2903351. This expanded contact arrangement does not compromise compatibility in applications designed for SPDT operation, as DPDT relays can be configured to function as SPDT devices through appropriate terminal connection methodology.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903343 directly replace the 2903351 in existing installations?

A: Yes. Both relays share identical coil voltage (230VAC), contact rating (50mA), switching voltage (30VAC/36VDC max), operating temperature range (-40°C to 50°C), and termination style (screw terminal). The DPDT configuration of the 2903343 is compatible with SPDT circuit applications.

Q: What is the significance of the contact form difference between SPDT and DPDT?

A: SPDT (Single Pole Double Throw) provides one independent switching circuit with three terminals. DPDT (Double Pole Double Throw) provides two independent switching circuits with six terminals. The 2903343 DPDT configuration offers expanded switching capability while maintaining full backward compatibility with SPDT applications through selective terminal utilization.

Q: Why is the 2903351 classified as obsolete?

A: Product obsolescence indicates that the manufacturer has discontinued production. The Phoenix Contact 2903343 represents the active equivalent within the RIF series, ensuring continued component availability and supply chain continuity.

Q: Are there compliance differences between the two relays?

A: The 2903351 carries RoHS Compliant certification. The 2903343 carries ROHS3 Compliant certification, representing an enhanced compliance standard. Both relays meet current regulatory requirements for electronic component manufacturing.

Q: What packaging options are available?

A: The 2903351 was supplied in standard packaging. The 2903343 is available in bulk packaging, suitable for high-volume procurement and integration into manufacturing workflows.