Phoenix Contact 2903338 General Purpose Relay SPDT 50MA 24V - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903338 is a general purpose relay with Single Pole Double Throw (SPDT) contact configuration, rated for 50 mA at 24VDC coil voltage. This component is designed for DIN rail mounting and includes integrated features such as a diode, lighted indicator, and socket. The part is currently listed as obsolete, making identification of suitable substitute components essential for system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

2903338

Phoenix ContactIn Stock: 8422903338 Datasheet

Current PartRFQ

2903330

Phoenix ContactIn Stock: 16752903330 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Phoenix Contact 2903338 is determined by the following critical parameters:

• Coil Voltage: 24VDC (must match exactly)
• Coil Current: 18 mA (must match exactly)
• Contact Rating (Current): 50 mA (must match exactly)
• Switching Voltage: 30VAC, 36VDC - Max (must match exactly)
• Mounting Type: DIN Rail (must match exactly)
• Termination Style: Spring Terminal (must match exactly)
• Operating Temperature Range: -40°C ~ 70°C (must match exactly)
• Contact Material: Silver Nickel (AgNi), Gold (Au) (must match exactly)

The Phoenix Contact 2903330 is identified as a substitute part. While this component shares the same manufacturer, series, coil specifications, current ratings, switching voltage, mounting type, termination style, temperature range, and contact materials, it differs in contact form configuration. The 2903330 features a DPDT (2 Form C) contact arrangement compared to the SPDT (1 Form C) configuration of the 2903338. This substitution is valid only in applications where the additional contact form does not create functional conflicts or where the extra contacts can be left unused.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903330 is the identified substitute for the obsolete 2903338. Both components are manufactured by Phoenix Contact within the RIF series and share identical electrical and mechanical specifications with the exception of contact form configuration.

The 2903330 carries Active product status, ensuring continued availability and supply chain support. The 2903330 meets ROHS3 compliance, representing an updated environmental standard compared to the RoHS compliance of the original 2903338. Both components maintain MSL 1 (Unlimited) moisture sensitivity rating and are classified under ECCN EAR99 with HTSUS code 8536.41.0020.

Selection of the 2903330 as a replacement is appropriate for applications where the DPDT contact configuration does not introduce circuit conflicts. In applications requiring strictly SPDT functionality with no provision for additional contacts, alternative relay solutions from the Phoenix Contact RIF series or equivalent manufacturers should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903330 directly replace the 2903338 in all applications?

A: The 2903330 shares all critical electrical and mechanical parameters with the 2903338, including coil voltage, current ratings, switching voltage, and operating temperature range. However, the 2903330 features DPDT (2 Form C) contact configuration versus the SPDT (1 Form C) of the 2903338. Direct replacement is possible only if the circuit design accommodates the additional contact form or if unused contacts can be left unconnected without affecting system operation.

Q: What is the significance of the contact form difference between these parts?

A: The SPDT configuration provides one changeover contact (one common terminal with two switching positions). The DPDT configuration provides two independent changeover contacts. Applications designed for SPDT operation require only one contact pair; the additional contact pair in the DPDT relay must be managed in the circuit design to prevent unintended switching or signal conflicts.

Q: Are there differences in compliance or certifications between these parts?

A: Both components are RoHS compliant. The 2903330 carries ROHS3 compliance, representing a more recent environmental standard. Both maintain identical MSL 1 (Unlimited) ratings and ECCN/HTSUS classifications. The 2903330 is additionally noted as REACH Affected.

Q: Why is the 2903338 listed as obsolete?

A: The 2903338 is obsolete, indicating it is no longer in active production. The 2903330 remains in Active status, making it the recommended path for new designs and replacement applications requiring Phoenix Contact RIF series relay functionality at 24VDC with 50 mA contact rating.

Q: Are the socket and mounting interfaces identical between these parts?

A: Both components feature DIN rail mounting and spring terminal termination style. Both include socket mounting capability as part of their integrated features. Physical compatibility should be confirmed through mechanical drawings if retrofitting into existing installations.