Phoenix Contact 2949994 General Purpose Relay SPST-NO 24VDC - Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2949994 is a general purpose relay with SPST-NO (1 Form A) contact configuration, rated for 10A at 250VAC maximum switching voltage with a 24VDC coil. This relay is designed for DIN rail mounting and includes integrated diode protection, lighted indicator, and socket connectivity. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing system maintenance and new design implementations.

Substiute Parts

2949994

Phoenix ContactIn Stock: 8602949994 Datasheet

Current PartRFQ

1078683

Phoenix ContactIn Stock: 11031078683 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Phoenix Contact 2949994 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Coil Voltage: 24VDC
• Contact Form: SPST-NO (1 Form A)
• Mounting Type: DIN Rail
• Coil Type: Non Latching

Allowable Variation Parameters:

• Contact Rating (Current): Substitute must equal or exceed 10A
• Switching Voltage: Substitute must support minimum 250VAC
• Termination Style: May differ (screw vs. spring terminal) based on installation requirements
• Operating Temperature Range: Substitute must encompass or exceed the operating envelope
• Contact Material: May vary while maintaining electrical performance specifications
• Approval Certifications: Substitute must maintain equivalent or superior regulatory compliance

The Phoenix Contact 1078683 qualifies as a substitute despite lower current rating (6A vs. 10A) because it shares the mandatory electrical and mechanical parameters. However, applications requiring the full 10A capacity must verify load compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Load ≤ 6A): The Phoenix Contact 1078683 is the primary substitute for the obsolete 2949994. Both relays maintain identical coil voltage, contact form, and mounting configuration. The 1078683 offers active product status with current manufacturing support, ensuring long-term availability. The part carries ROHS3 compliance and REACH affected status, meeting current environmental regulations. The spring terminal configuration requires installation method verification but provides equivalent electrical performance for applications within the 6A current rating.

For Applications Requiring Full 10A Capacity: The 1078683 current rating of 6A is insufficient for loads exceeding this threshold. Alternative Phoenix Contact relay series must be evaluated to maintain the 10A contact rating while preserving the 24VDC coil voltage and SPST-NO configuration.

Regulatory and Compliance Considerations: The 1078683 maintains cULus equivalent certifications through its active product status and ROHS3 compliance. The transition from Silver Cadmium Oxide to Silver Tin Oxide contact material reflects current environmental standards and does not compromise switching performance within specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the 1078683 directly replace the 2949994 in all applications? A: Direct replacement is valid only for applications where the load current does not exceed 6A. The 1078683 contact rating is 6A compared to the 2949994's 10A rating. Load verification is required before substitution.

Q: What is the difference between screw and spring terminals? A: The 2949994 uses screw terminals requiring manual tightening for wire connection. The 1078683 uses spring terminals that accept wire insertion without tools. Both provide equivalent electrical connection; installation method differs based on panel design and maintenance procedures.

Q: Are the coil currents compatible with existing control circuits? A: The 1078683 draws 18 mA compared to the 2949994's 28 mA. This lower coil current may improve control circuit efficiency but requires verification that the control circuit can supply minimum voltage at the reduced current draw. The 1078683 specifies a must-operate voltage of 20.2 VDC.

Q: Does the contact material change affect performance? A: The 1078683 uses Silver Tin Oxide (AgSnO) instead of Silver Cadmium Oxide (AgCdO). Both materials are suitable for general purpose relay applications at the specified switching voltages and currents. The material change reflects current manufacturing standards and environmental compliance.

Q: What is the temperature operating range difference? A: The 1078683 operates from -40°C to 60°C compared to the 2949994's -20°C to 50°C range. The substitute provides extended low-temperature capability and higher maximum temperature rating, suitable for broader environmental applications.

Q: Is the 1078683 currently available? A: Yes, the 1078683 is classified as active product status with 1086 pieces in stock. The 2949994 is obsolete with no ongoing manufacturing support.