Phoenix Contact 2903303 General Purpose Relay DPDT 24VDC - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2903303 is a general purpose relay with DPDT (2 Form C) contact configuration, designed for 24VDC coil operation on DIN rail mounting. This relay is classified as obsolete, making identification of equivalent substitute parts essential for system maintenance and component procurement. The 2903303 provides 10A contact rating with dual-pole, dual-throw switching capability suitable for industrial control applications requiring reliable electromagnetic switching.

Substiute Parts

2903303

Phoenix ContactIn Stock: 9862903303 Datasheet

Current PartRFQ

2903300

Phoenix ContactIn Stock: 8932903300 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Phoenix Contact 2903303 is determined by the following critical parameters that must align with the original specification:

Mandatory Matching Parameters:

• Coil Voltage: 24VDC
• Mounting Type: DIN Rail
• Coil Type: Non Latching
• Coil Current: 60 mA
• Coil Resistance: 400 Ohms
• Operating Temperature Range: -40°C ~ 60°C
• Termination Style: Screw Terminal
• Contact Material: Silver Nickel (AgNi)
• Switching Voltage: 250VAC, 250VDC - Max

Allowable Variation Parameters:

• Contact Form: May differ (DPDT to 3PDT acceptable if application logic permits)
• Contact Rating (Current): May be lower if application current demand is satisfied
• Features: May include same or equivalent protective features

The Phoenix Contact 2903300 qualifies as a substitute based on matching coil specifications, mounting configuration, and environmental operating parameters, despite differences in contact form and current rating.

Parameter Comparison

Engineering Selection Recommendations

The Phoenix Contact 2903300 is an active product substitute for the obsolete 2903303. Both relays share identical coil specifications (24VDC, 60 mA, 400 Ohms), matching switching voltage ratings, and equivalent environmental operating ranges. The 2903300 provides enhanced RoHS3 compliance status compared to the 2903303's RoHS compliance designation.

The primary difference between these relays is the contact configuration: the 2903303 provides DPDT (2 Form C) with 10A rating, while the 2903300 provides 3PDT (3 Form C) with 8.5A rating. Selection between these parts depends on circuit requirements. If the application requires only two independent switching poles, the 2903303's DPDT configuration is the direct match. If the application can utilize three independent switching poles or requires only two poles with the third available as spare, the 2903300 is a suitable substitute provided the 8.5A contact rating satisfies the load current requirements.

Both relays feature identical protective features (diode, lighted indicator, socket included) and screw terminal termination, ensuring mechanical and electrical compatibility within DIN rail mounting systems.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2903300 directly replace the 2903303 in all applications?

A: The 2903300 is a functional substitute only if the application circuit can operate with 3PDT (3 Form C) contact configuration instead of DPDT (2 Form C), and if the load current does not exceed 8.5A. The coil specifications, switching voltage, and environmental ratings are identical, ensuring electrical compatibility. Circuit redesign may be required if the application specifically requires only two switching poles.

Q: What are the critical parameters that must match for relay substitution?

A: The following parameters must match: coil voltage (24VDC), coil current (60 mA), coil resistance (400 Ohms), mounting type (DIN Rail), termination style (screw terminal), contact material (Silver Nickel), switching voltage (250VAC/250VDC max), and operating temperature range (-40°C to 60°C). Contact form and current rating may vary if application requirements permit.

Q: Why is the 2903303 classified as obsolete?

A: The 2903303 is listed as obsolete by Phoenix Contact. The active substitute 2903300 provides equivalent coil and switching specifications with enhanced RoHS3 compliance, making it the recommended replacement for new designs and system maintenance.

Q: Are there packaging differences between these relays?

A: The 2903303 is specified with "-" packaging notation, while the 2903300 is supplied in bulk packaging. Both relays use identical DIN rail mounting and screw terminal configurations, ensuring mechanical compatibility regardless of packaging format.

Q: What is the significance of the RoHS compliance difference?

A: The 2903303 carries RoHS compliance status, while the 2903300 carries ROHS3 compliance status. ROHS3 represents an updated compliance designation reflecting current regulatory requirements. Both relays meet hazardous substance restriction standards applicable to their respective product statuses.