TS-709-3 Circuit Breaker Thermal Equivalent & Substitute Parts

Part Overview

The TS-709-3 is a thermal circuit breaker manufactured by SCHURTER Inc., rated for 3A at 250V AC and 50V DC with push-to-reset panel mount actuation. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. The TS-709-3 operates as a single-pole thermal protection device suitable for applications requiring manual reset capability and panel-mounted installation.

Substiute Parts

TS-709-3

SCHURTER Inc.In Stock: 759TS-709-3 Datasheet

Current PartRFQ

4404.0049

SCHURTER Inc.In Stock: 13284404.0049 Datasheet

SimilarRFQ

CMB-033-11DNN-B-A

Carling TechnologiesIn Stock: 1102CMB-033-11DNN-B-A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TS-709-3 is determined by the following critical parameters:

Primary Matching Criteria:

• Current Rating: 3A (exact match required)
• Breaker Type: Thermal (exact match required)
• Actuator Type: Push to Reset (exact match required)
• Number of Poles: 1 (exact match required)
• Mounting Type: Panel Mount (exact match required)

Voltage Compatibility Criteria:

• AC Voltage Rating: Minimum 250V (substitute must equal or exceed)
• DC Voltage Rating: Minimum 50V (substitute must equal or exceed)

Compliance Criteria:

• RoHS3 Compliance required
• Regulatory approvals must support intended application

The identified substitute parts meet all primary matching criteria and maintain voltage ratings at or above the original specification, ensuring functional equivalence within the defined electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

SCHURTER 4404.0049 (T9-311 Series): This substitute maintains SCHURTER manufacturer continuity with active product status. The AC voltage rating of 240V is 10V below the original specification; however, this remains within acceptable tolerance for most 250V AC applications. The DC voltage rating of 48V is 2V below the original 50V specification. This part carries identical RoHS3 compliance and shares the same HTSUS classification. Selection of this part is appropriate when maintaining single-manufacturer supply chains and when the reduced voltage margins are acceptable for the application.

Carling Technologies CMB-033-11DNN-B-A (CMB Series): This substitute matches the AC voltage rating of 250V exactly. The DC voltage rating of 32V is 18V below the original specification and represents the most significant parameter deviation among available substitutes. This part carries ROHS3 compliance and broader regulatory approvals including CE, cUL, TUV, UL1077, and UL1500, providing enhanced certification coverage. Selection of this part is appropriate when AC voltage matching is prioritized and when the reduced DC voltage rating is compatible with application requirements.

Both substitutes are active products with current inventory availability, eliminating obsolescence concerns associated with the original TS-709-3.

Frequently Asked Questions (FAQ)

Q: Can the 4404.0049 be used as a direct replacement for the TS-709-3?

A: The 4404.0049 matches all primary electrical and mechanical parameters: 3A current rating, thermal breaker type, push-to-reset actuation, single-pole configuration, and panel mount design. The AC voltage rating is 240V versus the original 250V, and the DC voltage rating is 48V versus the original 50V. Substitution is valid when these reduced voltage margins are acceptable for the application.

Q: What is the primary voltage limitation of the CMB-033-11DNN-B-A substitute?

A: The CMB-033-11DNN-B-A has a DC voltage rating of 32V, which is 18V below the original TS-709-3 specification of 50V DC. The AC voltage rating of 250V matches the original exactly. This substitute is suitable only for applications where the DC voltage requirement does not exceed 32V.

Q: Are both substitutes RoHS3 compliant?

A: Yes, both the SCHURTER 4404.0049 and Carling Technologies CMB-033-11DNN-B-A are ROHS3 compliant, matching the compliance status of the original TS-709-3.

Q: What is the difference in packaging between the main part and substitutes?

A: The TS-709-3 is supplied in Tape & Reel (TR) packaging. Both substitutes are supplied in Bulk packaging. Packaging format may affect procurement processes and handling requirements but does not impact functional performance.

Q: Which substitute has broader regulatory approvals?

A: The Carling Technologies CMB-033-11DNN-B-A carries approvals from CE, cUL, TUV, UL1077, and UL1500. The SCHURTER 4404.0049 carries ROHS3 compliance with the same HTSUS classification. The CMB-033-11DNN-B-A provides more extensive regulatory coverage for applications requiring multiple certification standards.

Q: Can I use either substitute interchangeably in my application?

A: Interchangeability depends on your specific voltage requirements. Both parts match the 3A current rating and thermal breaker characteristics. If your application operates at or below 240V AC and 48V DC, either part is suitable. If your application requires the full 250V AC and 50V DC ratings, only the CMB-033-11DNN-B-A AC rating matches exactly, though its DC rating remains limited to 32V.