Phoenix Contact 2903274 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903274 is a general purpose relay featuring a 3PST-NO (3 Form A) contact configuration with 120VAC coil voltage and 8A contact rating. This DIN rail-mounted relay is designed for industrial control applications requiring multiple independent normally-open switching circuits. The part is currently obsolete, making identification of suitable substitute components essential for system maintenance and replacement applications.

Substiute Parts

2903274

Phoenix ContactIn Stock: 10382903274 Datasheet

Current PartRFQ

2903277

Phoenix ContactIn Stock: 8372903277 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Phoenix Contact 2903277 qualifies as a substitute based on the following critical parameters that remain constant across both components:

• Manufacturer and Series: Both are Phoenix Contact RIF series relays
• Coil Voltage: Identical 120VAC specification
• Current Rating: Both rated for 8A contact current
• Switching Voltage: Both support 440VAC, 250VDC maximum
• Coil Current: Both require 24 mA coil drive
• Mounting and Termination: Both use DIN rail mounting with spring terminals
• Operating Temperature: Identical -40°C ~ 40°C range
• Contact Material: Both use Silver Nickel (AgNi)
• Timing Characteristics: Both have 25 ms operate time and 20 ms release time

The primary difference between these components is the contact form configuration: the 2903274 provides 3PST-NO (3 Form A) contacts, while the 2903277 provides 3PDT (3 Form C) contacts. This distinction affects circuit design requirements and must be evaluated based on application needs.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903277 is available as an active product with current manufacturing support, whereas the 2903274 is obsolete. Both components meet identical electrical and mechanical specifications for coil voltage, contact current rating, switching voltage, timing characteristics, and operating temperature range.

The 2903277 provides enhanced compliance status with ROHS3 certification and REACH compliance documentation, compared to the 2903274's RoHS compliance. For applications requiring long-term component availability and regulatory documentation, the 2903277 represents the appropriate selection.

Circuit design modifications are required when transitioning from the 2903274 to the 2903277 due to the contact form difference: the 2903274 provides three independent normally-open contacts (3PST-NO), while the 2903277 provides three changeover contacts (3PDT). Applications utilizing only the normally-open functionality of the 2903274 can implement the 2903277 by using only the normally-open contact positions of each changeover pair.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903277 directly replace the 2903274 in all applications?

A: Direct replacement depends on circuit design. Both relays share identical coil voltage (120VAC), contact current rating (8A), switching voltage capability (440VAC, 250VDC), and timing characteristics. The 2903277 provides additional contact functionality (changeover contacts) compared to the 2903274 (normally-open contacts). Applications using only normally-open switching can implement the 2903277 by utilizing the normally-open contact positions.

Q: What is the difference between 3PST-NO and 3PDT contact configurations?

A: The 2903274 provides 3PST-NO (3 Form A) configuration, delivering three independent normally-open contacts that close when the relay coil is energized. The 2903277 provides 3PDT (3 Form C) configuration, delivering three changeover contacts, each with normally-open and normally-closed positions. The 3PDT configuration offers greater circuit flexibility but requires circuit design evaluation for compatibility.

Q: Are there packaging differences between these components?

A: The 2903274 is listed with standard packaging, while the 2903277 is supplied in bulk packaging. Both components use identical DIN rail mounting and spring terminal termination styles. Packaging differences do not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to each component?

A: The 2903274 carries RoHS compliance certification. The 2903277 carries ROHS3 compliance certification and includes REACH compliance status documentation. Both components are rated for identical operating temperature ranges and environmental conditions.

Q: Why is the 2903274 listed as obsolete?

A: The 2903274 is no longer in active production. The Phoenix Contact 2903277 represents the current active product offering within the RIF series with equivalent electrical specifications and enhanced compliance certifications.