Phoenix Contact 2903337 Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903337 is a general purpose relay with SPDT (Single Pole Double Throw) contact configuration, designed for DIN rail mounting. This relay operates at 24VAC coil voltage with a 50mA contact rating and includes integrated features such as a lighted indicator, socket, and varistor protection. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component procurement.

Substiute Parts

2903337

Phoenix ContactIn Stock: 7662903337 Datasheet

Current PartRFQ

2903329

Phoenix ContactIn Stock: 8672903329 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Phoenix Contact 2903337 is constrained by the following critical parameters:

• Coil Voltage: 24VAC operation is mandatory for direct replacement
• Mounting Type: DIN rail mounting must be maintained for mechanical compatibility
• Contact Rating: 50mA current capacity must be preserved or exceeded
• Switching Voltage: Maximum 30VAC, 36VDC specification must be met or exceeded
• Coil Current: 33mA draw must be accommodated by control circuitry
• Timing Characteristics: 12ms operate time and 20ms release time define response behavior
• Operating Temperature: -40°C to 50°C range must be supported
• Contact Material: Silver Nickel and Gold plating provide corrosion resistance and low contact resistance

The Phoenix Contact 2903329 shares identical electrical and mechanical specifications with the 2903337 across all critical parameters. The primary difference is contact configuration: the 2903329 provides DPDT (Double Pole Double Throw) functionality, offering two independent switching circuits instead of one. This expanded contact form allows the 2903329 to serve applications requiring dual-channel switching while maintaining full compatibility with the coil drive and environmental specifications of the original design.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903329 is the active production equivalent for the obsolete 2903337. Both relays operate identically across all electrical and mechanical parameters, with the 2903329 offering enhanced regulatory compliance through ROHS3 certification and active product status ensuring continued availability.

Selection between these parts depends on circuit requirements:

• Single-channel switching applications: The 2903337 SPDT configuration provides one independent switching circuit. The 2903329 DPDT configuration provides two independent switching circuits within the same form factor.
• Regulatory compliance: The 2903329 meets current ROHS3 standards and includes REACH compliance documentation, suitable for applications with evolving environmental regulations.
• Supply continuity: The 2903329 maintains active production status with 774 units in stock, whereas the 2903337 is obsolete with limited remaining inventory.

Both relays are mechanically and electrically interchangeable at the coil interface. Circuit redesign may be required if the application utilizes only one contact form and cannot accommodate the additional switching circuits provided by the DPDT configuration.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903329 directly replace the 2903337 in existing installations?

A: The 2903329 is electrically and mechanically compatible at the coil drive level. Both relays require identical 24VAC, 33mA control signals and mount on standard DIN rail. However, the 2903329 provides DPDT (two Form C contacts) versus the 2903337 SPDT (one Form C contact). If the application uses only one switching circuit, the additional contact form in the 2903329 remains unused but does not affect operation of the active circuit.

Q: What are the key electrical parameters that must match for substitution?

A: Critical matching parameters are coil voltage (24VAC), coil current (33mA), contact rating (50mA minimum), switching voltage rating (30VAC, 36VDC maximum), and timing characteristics (12ms operate, 20ms release). All these parameters are identical between the 2903337 and 2903329.

Q: Does the contact form difference affect compatibility?

A: Contact form refers to the number and configuration of switching circuits. SPDT provides one independent circuit; DPDT provides two. The 2903329 DPDT configuration is a superset of the 2903337 SPDT functionality. Applications requiring single-channel switching will operate correctly with the 2903329, with the second contact form available for future expansion or alternative use.

Q: Are there packaging differences between these relays?

A: The 2903337 is specified with "-" packaging notation (indicating standard DIN rail module format), while the 2903329 is specified as Bulk packaging. Both relays use identical spring terminal connections and socket-based mounting. Packaging designation reflects inventory and distribution format rather than physical relay construction.

Q: What compliance certifications apply to each part?

A: The 2903337 carries RoHS Compliant certification. The 2903329 carries ROHS3 Compliant certification and includes REACH Affected status. Both relays meet EAR99 export classification and share identical HTSUS commodity codes. The 2903329 represents current regulatory compliance for new designs.