Phoenix Contact 2903353 General Purpose Relay SPDT 50MA 24V - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903353 is a general purpose relay with Single Pole Double Throw (SPDT) contact configuration, rated for 50 mA at 24VAC coil voltage. This relay is designed for DIN rail mounting and includes integrated features such as a lighted indicator, socket, and varistor protection. The product is currently classified as obsolete, making identification of suitable substitute components essential for system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

2903353

Phoenix ContactIn Stock: 10232903353 Datasheet

Current PartRFQ

2903345

Phoenix ContactIn Stock: 8912903345 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Phoenix Contact 2903353 is determined by the following critical parameters:

• Coil Voltage: 24VAC (must match exactly for direct replacement without circuit modification)
• Coil Current: 33 mA (determines power supply compatibility)
• Mounting Type: DIN Rail (ensures mechanical fit in existing installations)
• Contact Rating: 50 mA (maximum current-switching capability)
• Switching Voltage: 30VAC, 36VDC - Max (defines load voltage compatibility)
• Coil Type: Non Latching (operational behavior requirement)
• Operating Temperature Range: -40°C ~ 50°C (environmental suitability)
• Contact Material: Silver Nickel (AgNi) (electrical performance and reliability)

The Phoenix Contact 2903345 is identified as a substitute part. While this part shares identical electrical parameters for coil voltage, coil current, switching voltage, coil type, operate/release times, operating temperature range, contact material, and coil resistance, it differs in contact form configuration (DPDT vs. SPDT). This difference requires circuit-level evaluation to determine applicability in specific installations.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903345 is an active product with current manufacturing status, whereas the 2903353 is obsolete. Both parts comply with RoHS requirements, with the 2903345 meeting ROHS3 specifications and the 2903345 additionally subject to REACH compliance.

All electrical parameters—coil voltage, coil current, switching voltage, contact rating, operate/release times, operating temperature range, contact material, and coil resistance—are identical between the two parts. The primary distinction is the contact form: the 2903353 provides SPDT (1 Form C) configuration, while the 2903345 provides DPDT (2 Form C) configuration.

Selection of the 2903345 as a substitute is appropriate when the application circuit can accommodate the additional contact pole provided by the DPDT configuration. In applications where only single-pole switching is required, the additional contact pole of the 2903345 remains unused but does not degrade performance. The active product status of the 2903345 ensures ongoing availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903345 directly replace the 2903353 in all applications?

A: The 2903345 shares all critical electrical parameters with the 2903353, including coil voltage (24VAC), coil current (33 mA), contact rating (50 mA), switching voltage (30VAC, 36VDC - Max), and timing characteristics. The 2903345 provides DPDT (2 Form C) contact configuration versus the SPDT (1 Form C) of the 2903353. Direct replacement is possible in applications where the circuit design can accommodate or ignore the additional contact pole.

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

A: SPDT (Single Pole Double Throw) provides one independent contact that switches between two positions. DPDT (Double Pole Double Throw) provides two independent contacts, each switching between two positions. If the application requires only single-pole switching, the 2903345 can be used with one contact pole utilized and the second pole unused. If the application requires dual-pole switching, the 2903345 provides this capability directly.

Q: Are there compliance or certification differences between the 2903353 and 2903345?

A: Both parts are RoHS compliant. The 2903345 meets ROHS3 specifications and is subject to REACH compliance requirements. The 2903353 is RoHS compliant without additional REACH designation. Both parts carry EAR99 ECCN classification.

Q: Why is the 2903353 listed as obsolete?

A: The 2903353 is classified as obsolete by Phoenix Contact. The 2903345, with equivalent electrical performance and active product status, represents the current manufacturing alternative within the RIF series for 24VAC general purpose relay applications.

Q: Does the packaging difference affect substitution?

A: The 2903353 is supplied in standard packaging, while the 2903345 is supplied in bulk packaging. Packaging format does not affect electrical or mechanical compatibility; it reflects order quantity and logistics considerations.