Phoenix Contact 2903273 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903273 is a general purpose relay featuring a 3PST-NO (3 Form A) contact configuration with 230VAC 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 scenarios.

Substiute Parts

2903273

Phoenix ContactIn Stock: 10452903273 Datasheet

Current PartRFQ

2903276

Phoenix ContactIn Stock: 12242903276 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Phoenix Contact 2903276 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 230VAC specification
• Current Rating: Both rated for 8A contact current
• Switching Voltage: Identical maximum ratings (440VAC, 250VDC)
• Coil Current: Both require 14 mA
• Mounting Configuration: Both are DIN rail-mounted
• Operating Temperature: Identical range (-40°C ~ 40°C)
• Contact Material: Both use Silver Nickel (AgNi)
• Electrical Compliance: Both are RoHS compliant

The primary difference between these components is the contact form configuration: the 2903273 provides 3PST-NO (3 Form A) contacts, while the 2903276 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The Phoenix Contact 2903276 is available as an active product with current manufacturing support, whereas the 2903273 is obsolete. Both components maintain identical electrical specifications for coil voltage, current rating, switching voltage, and operating temperature range. Both are RoHS compliant and feature identical mechanical mounting and termination characteristics.

Selection between these components depends on circuit architecture requirements. The 2903273 provides three independent normally-open contacts suitable for applications requiring multiple independent switching circuits. The 2903276 provides three changeover contacts (Form C), offering both normally-open and normally-closed switching capability per pole. Applications requiring only normally-open switching can utilize either component; applications requiring changeover functionality must use the 2903276.

Frequently Asked Questions (FAQ)

Q: Can the 2903276 directly replace the 2903273 in existing installations?

A: Direct replacement is possible from an electrical and mechanical standpoint. Both components share identical coil voltage (230VAC), current ratings (8A), switching voltage limits (440VAC, 250VDC), and DIN rail mounting. However, circuit design must accommodate the different contact configurations. The 2903273 provides Form A (normally-open) contacts, while the 2903276 provides Form C (changeover) contacts. Verify that the application circuit can function with the additional normally-closed contact capability of the 2903276.

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

A: Contact form defines the switching capability of each pole. Form A (3PST-NO) provides three independent normally-open contacts that close when the coil is energized. Form C (3PDT) provides three poles, each with both a normally-open and normally-closed contact. The choice depends on whether the application requires only make contacts or both make and break functionality per pole.

Q: Are both relays compatible with the same socket and mounting infrastructure?

A: Both the 2903273 and 2903276 are Phoenix Contact RIF series relays with identical DIN rail mounting and spring terminal configuration. Both include socket compatibility and identical mechanical dimensions within the series. Existing DIN rail infrastructure and sockets designed for the 2903273 will accommodate the 2903276.

Q: What is the operational difference between these relays in terms of response time?

A: Both relays share identical operate time (25 ms) and release time (20 ms) specifications. No performance difference exists in switching speed between these components.

Q: Are there packaging differences between the main part and substitute?

A: The 2903273 is listed with dash packaging notation, while the 2903276 is supplied in bulk packaging. This reflects inventory and distribution differences but does not affect component functionality or electrical performance.