7303SYCLE Toggle Switch 3PDT Equivalent & Substitute Parts

Part Overview

The 7303SYCLE is a 3PDT toggle switch manufactured by C&K, rated for 5A at 120V AC and 28V DC. This panel-mount switch features a standard round actuator with PC pin termination and epoxy sealed terminals. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring compatible switching functionality.

Substiute Parts

7303SYCLE

C&KIn Stock: 12237303SYCLE Datasheet

Current PartRFQ

7303SYCRE

C&KIn Stock: 11267303SYCRE Datasheet

DirectRFQ

34A3P31B1M2QT

Grayhill Inc.In Stock: 97634A3P31B1M2QT Datasheet

SimilarRFQ

A321S1YCQ

ElectroswitchIn Stock: 863A321S1YCQ Datasheet

SimilarRFQ

MTA306EPC

TE Connectivity ALCOSWITCH SwitchesIn Stock: 723MTA306EPC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7303SYCLE is determined by the following critical parameters:

• Circuit Configuration: Must be 3PDT
• Switch Function: Must be On-Off-On
• Mounting Type: Must be Panel Mount
• Termination Style: Must be PC Pin
• Bushing Thread: Must be 1/4-40
• Current Rating: Minimum 5A (AC/DC)
• Voltage Rating - AC: Minimum 120V
• Voltage Rating - DC: Minimum 28V
• Actuator Type: Standard Round
• Operating Temperature Range: Must encompass -30°C to 85°C

The 7303SYCRE is a direct manufacturer equivalent from C&K with identical electrical and mechanical specifications but with active product status and improved RoHS compliance. The remaining substitute parts (34A3P31B1M2QT, A321S1YCQ, and MTA306EPC) meet the core substitution criteria with minor parameter variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

7303SYCRE (C&K): This is the preferred direct replacement for the obsolete 7303SYCLE. It maintains identical electrical and mechanical specifications while offering active product status and RoHS compliance. This part is recommended for new designs and system upgrades where C&K compatibility is required.

34A3P31B1M2QT (Grayhill Inc.): This substitute meets all core electrical and mechanical requirements with AC voltage rating of 125V, exceeding the 120V requirement. The actuator length variance of 0.26mm is within acceptable mechanical tolerance. RoHS compliance and active product status support long-term availability.

A321S1YCQ (Electroswitch): This substitute provides enhanced current ratings (6A AC/DC) and extended electrical life (60,000 cycles). The operating temperature range extends to 90°C, providing additional thermal margin. Epoxy sealed terminals match the original specification. Panel cutout dimensions are not specified; mechanical compatibility must be verified.

MTA306EPC (TE Connectivity ALCOSWITCH): This substitute offers 6A AC current rating with ROHS3 compliance. The DC current rating is limited to 4A, which meets the 5A requirement only for AC applications. Operating temperature range is -20°C to 80°C, which does not fully encompass the original -30°C lower limit. This part is suitable for applications where DC current does not exceed 4A and minimum operating temperature does not fall below -20°C.

Frequently Asked Questions (FAQ)

Q: Can the 7303SYCRE be used as a direct replacement for the 7303SYCLE?

A: Yes. The 7303SYCRE maintains identical electrical ratings (5A at 120V AC, 28V DC), circuit configuration (3PDT), switch function (On-Off-On), mounting type (Panel Mount), actuator specifications, and termination style (PC Pin). The primary differences are active product status and improved RoHS compliance.

Q: What are the key differences between the substitute parts?

A: The 34A3P31B1M2QT and A321S1YCQ provide higher AC voltage ratings (125V vs. 120V). The A321S1YCQ offers enhanced current capacity (6A) and extended electrical life (60,000 cycles). The MTA306EPC provides 6A AC rating but is limited to 4A DC and has a reduced operating temperature range (-20°C to 80°C).

Q: Are all substitute parts mechanically compatible with the original panel cutout?

A: The 7303SYCRE, 34A3P31B1M2QT, and A321S1YCQ share the same panel cutout dimensions (Circular - 6.35mm Dia) and bushing thread (1/4-40). The MTA306EPC panel cutout dimensions are not specified; mechanical fit must be verified before installation.

Q: Which substitute is recommended for applications requiring the lowest operating temperature?

A: The 7303SYCRE and 34A3P31B1M2QT both support the full -30°C to 85°C range. The A321S1YCQ extends to -30°C to 90°C. The MTA306EPC is limited to -20°C to 80°C and is not suitable for applications requiring -30°C operation.

Q: What is the impact of actuator length variations among substitute parts?

A: The original 7303SYCLE has an actuator length of 10.67mm. The 34A3P31B1M2QT and A321S1YCQ have 10.41mm actuators (0.26mm shorter), and the MTA306EPC has 10.49mm (0.18mm shorter). These variations are within typical mechanical tolerances for panel-mount toggle switches and do not affect electrical functionality. Panel geometry and operator ergonomics should be evaluated for specific applications.

Q: Are RoHS and REACH compliance considerations important for substitute selection?

A: RoHS and REACH compliance status should be evaluated based on application requirements and regulatory jurisdiction. The 7303SYCRE, 34A3P31B1M2QT, and A321S1YCQ are RoHS compliant. The MTA306EPC is ROHS3 compliant. REACH status varies; applications subject to REACH regulations should prioritize parts with confirmed REACH compliance or affected status documentation.

Q: Can the MTA306EPC be used in DC applications?

A: The MTA306EPC is rated for 4A DC, which is below the original 5A DC specification. It is suitable only for DC applications where current does not exceed 4A. For applications requiring full 5A DC capacity, the 7303SYCRE, 34A3P31B1M2QT, or A321S1YCQ are recommended.