SX0782 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The SX0782 is a panel-mount toggle switch with DPDT (Double Pole Double Throw) configuration manufactured by Bulgin. This component features a 10A AC/DC rating at 250V AC and 28V DC, with a Mom-Off-Mom switch function and screw terminal termination. The SX0782 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this circuit topology is required.

Substiute Parts

SX0782

BulginIn Stock: 1093SX0782 Datasheet

Current PartRFQ

C3972BA

BulginIn Stock: 2138C3972BA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SX0782 is determined by the following critical parameters:

Circuit Configuration: DPDT topology must be maintained to preserve electrical functionality in applications requiring simultaneous switching of two independent circuits.

Switch Function: Mom-Off-Mom operation must be preserved to maintain the momentary-off-momentary switching behavior required by the original design.

Mounting Type: Panel mount configuration is required for mechanical compatibility with existing enclosure cutouts and installation procedures.

Current and Voltage Ratings: Substitute parts must meet or exceed the original ratings (10A AC/DC, 250V AC, 28V DC) to ensure safe operation under specified load conditions.

Termination Style: While the original part uses screw terminals, substitute parts with alternative termination methods (such as quick-connect) may be acceptable if the application design permits connector adaptation.

Panel Cutout Compatibility: The circular 12.00mm diameter cutout dimension establishes the mechanical interface; substitute parts with similar or smaller cutout dimensions are compatible.

The C3972BA meets these substitution criteria through equivalent DPDT configuration, Mom-Off-Mom function, panel mount design, and superior electrical ratings that exceed the original specification.

Parameter Comparison

Engineering Selection Recommendations

The C3972BA is the manufacturer-recommended substitute for the obsolete SX0782. Both components are manufactured by Bulgin and maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory consistency.

The C3972BA provides enhanced electrical performance with higher AC current capacity (16A versus 10A) and improved DC voltage rating (36V versus 28V), while maintaining the required DPDT configuration and Mom-Off-Mom switching function. The active product status of the C3972BA ensures ongoing availability and supply chain reliability compared to the obsolete SX0782.

The primary design consideration is termination style: the C3972BA uses quick-connect terminals (0.250" / 6.3mm) rather than screw terminals. Applications currently using screw terminal connections will require connector adaptation or harness modification. The panel cutout diameter increases marginally from 12.00mm to 12.70mm, which may require minor panel modification depending on existing hole tolerances.

Frequently Asked Questions (FAQ)

Q: Can the C3972BA directly replace the SX0782 without any modifications?

A: The C3972BA is electrically and functionally equivalent but requires termination adaptation. The original SX0782 uses screw terminals while the C3972BA uses quick-connect terminals. Panel cutout diameter increases from 12.00mm to 12.70mm, which may require enlargement depending on existing hole tolerances.

Q: What are the key differences in electrical ratings between these parts?

A: The C3972BA exceeds the SX0782 in AC current capacity (16A versus 10A) and DC voltage rating (36V versus 28V). However, the C3972BA AC voltage rating is lower (125V versus 250V). Applications operating at 250V AC require verification that the C3972BA's 125V AC rating is compatible with the system design.

Q: Why is the SX0782 classified as obsolete?

A: The SX0782 is no longer manufactured by Bulgin. The C3972BA from the 3900 series represents the current active product line for equivalent DPDT toggle switch functionality.

Q: Are both parts RoHS compliant?

A: Yes, both the SX0782 and C3972BA are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the different panel cutout diameters?

A: The C3972BA requires a 12.70mm diameter cutout compared to the SX0782's 12.00mm diameter. Existing panels with 12.00mm holes may require enlargement to 12.70mm for proper fit, depending on hole tolerance specifications.

Q: Can I use the C3972BA in applications requiring 250V AC operation?

A: No. The C3972BA is rated for 125V AC maximum. Applications requiring 250V AC operation cannot use this substitute. Alternative components rated for 250V AC must be evaluated.