C&K 7103SYCLE Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The C&K 7103SYCLE is a panel-mounted toggle switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 5A at 120V AC and 28V DC. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The 7103SYCLE features a standard round actuator with epoxy-sealed PC pin termination, suitable for applications requiring reliable on-off-on switching functionality.

Substiute Parts

7103SYCLE

C&KIn Stock: 7287103SYCLE Datasheet

Current PartRFQ

7103SYCRE

C&KIn Stock: 11507103SYCRE Datasheet

DirectRFQ

A121S1DCQ

ElectroswitchIn Stock: 1105A121S1DCQ Datasheet

SimilarRFQ

A121S1YCQ

ElectroswitchIn Stock: 1166A121S1YCQ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7103SYCLE are identified based on matching electrical and mechanical parameters that ensure functional compatibility. The primary substitution criteria are:

Direct Equivalent (Same Manufacturer - C&K): The 7103SYCRE maintains identical electrical ratings (5A at 120V AC / 28V DC), circuit configuration (SPDT), mounting specifications (panel mount with 1/4-40 bushing thread), and mechanical dimensions (10.67mm actuator length, 6.35mm circular cutout). The 7103SYCRE is active product status, providing a direct replacement path for the obsolete 7103SYCLE.

Similar Alternatives (Cross-Manufacturer - Electroswitch): The A121S1DCQ and A121S1YCQ from Electroswitch provide functional substitution with allowable parameter variations. These parts maintain SPDT circuit configuration, panel mount installation, PC pin termination, and 1/4-40 bushing thread compatibility. Electrical ratings are higher (6A at 125V AC / 28V DC), operating temperature extends to 90°C, and electrical life reaches 60,000 cycles. Switch function differs from on-off-on to on-on configuration. These parts are suitable for applications where the higher electrical ratings and extended performance characteristics are acceptable.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): The C&K 7103SYCRE is the primary substitute for the obsolete 7103SYCLE. This part maintains identical electrical specifications, mechanical dimensions, and functional characteristics while offering active product status and improved compliance documentation (RoHS Compliant vs. ROHS3 Compliant). The 7103SYCRE is suitable for all applications currently using the 7103SYCLE without design modification.

For Cross-Manufacturer Substitution: The Electroswitch A121S1DCQ and A121S1YCQ are acceptable alternatives when higher electrical ratings and extended operating temperature range are compatible with system requirements. These parts support higher current capacity (6A vs. 5A) and higher AC voltage rating (125V vs. 120V), providing design margin for applications with variable load conditions. The extended electrical life (60,000 vs. 40,000 cycles) offers improved durability. Selection between A121S1DCQ and A121S1YCQ depends on packaging requirements (both available in bulk).

Compliance Considerations: All substitute parts maintain RoHS compliance and EAR99 export classification. The 7103SYCRE carries REACH Affected status, while Electroswitch parts show Vendor Undefined REACH status. Applications subject to REACH regulations should verify vendor documentation for the Electroswitch alternatives.

Frequently Asked Questions (FAQ)

Q: Can the 7103SYCRE directly replace the 7103SYCLE in existing designs? A: Yes. The 7103SYCRE maintains identical electrical ratings (5A at 120V AC / 28V DC), circuit configuration (SPDT), switch function (on-off-on), and mechanical specifications (panel mount, 1/4-40 bushing, 10.67mm actuator). No design modification is required.

Q: What are the key differences between the C&K 7103SYCRE and Electroswitch A121S1 series? A: The primary differences are current rating (5A vs. 6A), AC voltage rating (120V vs. 125V), switch function (on-off-on vs. on-on), actuator length (10.67mm vs. 10.41mm), operating temperature range (-30°C to 85°C vs. -30°C to 90°C), and electrical life (40,000 vs. 60,000 cycles). DC voltage rating (28V) and mounting specifications remain identical.

Q: Are the Electroswitch A121S1DCQ and A121S1YCQ interchangeable with each other? A: Yes. Both parts share identical electrical specifications, mechanical dimensions, and functional characteristics. Selection between them is based on packaging preference (both available in bulk).

Q: What is the significance of the switch function difference (on-off-on vs. on-on)? A: Switch function defines the actuator positions and electrical states. On-off-on provides three distinct positions with a center off state, while on-on provides two positions with both states active. Application requirements determine which function is appropriate.

Q: Can I use the Electroswitch alternatives in applications with the original 5A / 120V specifications? A: Yes. The Electroswitch A121S1 series with 6A / 125V ratings are rated above the original 5A / 120V specifications, providing design margin. The higher ratings do not prevent use in lower-specification applications.

Q: What packaging options are available for substitute parts? A: The C&K 7103SYCRE is available with standard packaging. The Electroswitch A121S1DCQ and A121S1YCQ are available in bulk packaging.