Phoenix Contact 2788391 Equivalent & Substitute Parts

Part Overview

The Phoenix Contact 2788391 is a 24 V 350 A varistor module designed for transient voltage suppression in rail and channel mounting applications. This component provides single-circuit protection with a varistor voltage of 24 V and surge current handling capability of 350 A. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, repair, and redesign applications where continued availability cannot be guaranteed.

Substiute Parts

2788391

Phoenix ContactIn Stock: 8012788391 Datasheet

Current PartRFQ

2906841

Phoenix ContactIn Stock: 7832906841 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The Phoenix Contact 2906841 is identified as a functional substitute for the 2788391 based on the following substitution criteria:

Voltage Protection Alignment: Both components are designed for 24 V nominal protection in DC applications. The 2788391 specifies a varistor voltage of 24 V with maximum DC rating of 31 V. The 2906841 provides continuous operating voltage (MCOV) of 30 VDC, establishing voltage compatibility within the same protection class.

Single-Circuit Configuration: Both parts provide single-pole/single-circuit protection, maintaining identical circuit topology and control architecture.

Transient Suppression Category: Both components function as transient voltage suppressors within the Phoenix Contact product family, designed for industrial control and power distribution applications.

DIN Rail Mounting Compatibility: The 2906841 utilizes DIN rail mounting, which accommodates the rail and channel mounting requirement of the original 2788391 in standard industrial enclosure installations.

Compliance and Certification: Both components maintain RoHS compliance and are certified for industrial applications, ensuring regulatory continuity in replacement scenarios.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 2788391 is classified as obsolete, while the 2906841 maintains active product status. For new designs, system upgrades, or long-term maintenance planning, the 2906841 is the appropriate selection due to continued manufacturer support and availability.

Voltage Compatibility: Both components operate within the 24 V protection class. The 2906841 provides slightly higher DC continuous operating voltage (30 VDC versus 31 VDC maximum), making it suitable for equivalent protection duty in 24 V systems.

Temperature Operating Range: The 2906841 extends the upper operating temperature limit to 85°C compared to the 2788391 at 60°C. This provides enhanced thermal margin in applications subject to elevated ambient or internal heating conditions.

Certification and Approvals: The 2906841 carries multiple industrial certifications (cCSAus, CSA, UL), providing broader regulatory acceptance across North American and international markets compared to the 2788391.

Mounting Integration: Both components support rail-based mounting configurations standard in industrial control enclosures, ensuring mechanical compatibility in existing installations.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 2906841 directly replace the 2788391 in existing installations?

A: Yes, within the constraints of mechanical mounting and electrical integration. Both components provide single-circuit 24 V transient voltage suppression. Verify that DIN rail mounting accommodates the existing enclosure configuration and that the 2906841's enhanced temperature rating does not conflict with thermal management design assumptions in the original system.

Q: What is the primary difference in current handling between these parts?

A: The 2788391 specifies 350 A surge current capacity, while the 2906841 specifies 2 kA discharge current at 8/20 microsecond waveform. These represent different measurement standards for transient suppression performance. The 2906841's higher discharge current indicates enhanced transient energy absorption capability.

Q: Are there packaging differences between the 2788391 and 2906841?

A: The 2788391 is supplied in module packaging for rail and channel mounting. The 2906841 is supplied in bulk packaging as a DIN rail module. Both are designed for industrial enclosure installation; verify mechanical fit within the specific mounting infrastructure.

Q: Why is the 2906841 recommended despite the 2788391 being listed as a substitute?

A: The 2906841 is the active product with current manufacturer support, extended temperature range, and multiple industrial certifications. The 2788391's obsolete status makes the 2906841 the preferred long-term solution for maintenance and new applications.

Q: Do both components require the same installation procedures?

A: Both components utilize DIN rail mounting and single-circuit protection architecture. Installation procedures are functionally equivalent; consult Phoenix Contact technical documentation for the 2906841 to confirm any minor differences in terminal configuration or connection methodology.