Bourns CB72A1B Thermal Cutoff - Equivalent & Substitute Parts

Part Overview

The Bourns CB72A1B is a thermal cutoff (TCO) breaker designed for 28VDC applications with a 25A current rating and 72°C (162°F) functioning temperature. This component is classified as discontinued at DiGi Electronics, making identification of suitable substitutes essential for ongoing system support and procurement planning. The part operates as a nonstandard package thermal protection device with cUL, TUV, and UL approvals.

Substiute Parts

CB72A1B

Bourns Inc.In Stock: 1183CB72A1B Datasheet

Current PartRFQ

CB72ABB

Bourns Inc.In Stock: 970CB72ABB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CB72A1B is determined by matching the following critical electrical and thermal parameters:

• Voltage Rating: 28VDC
• Current Rating: 25A
• Rated Functioning Temperature: 72°C (162°F)
• Holding Temperature: 25°C (77°F)
• Reset Temperature: 40°C (104°F)
• Approval Certifications: cUL, TUV, UL compliance

The CB72ABB meets all specified electrical, thermal, and certification requirements and is classified as a manufacturer-recommended substitute. This part maintains identical functional specifications while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The CB72ABB is the appropriate substitute for the discontinued CB72A1B. Both components are manufactured by Bourns Inc. within the CB series and carry identical electrical ratings, thermal thresholds, and regulatory certifications. The CB72ABB maintains active product status, ensuring continued availability and supply chain reliability. Selection of the CB72ABB eliminates obsolescence risk while preserving all functional and compliance requirements of the original specification.

Frequently Asked Questions (FAQ)

Q: Can the CB72ABB be used as a direct replacement for CB72A1B? A: Yes. The CB72ABB matches all critical electrical parameters (28VDC, 25A), thermal operating points (72°C functioning temperature, 25°C holding, 40°C reset), and regulatory certifications (cUL, TUV, UL). The parts are functionally equivalent.

Q: What is the primary difference between CB72A1B and CB72ABB? A: The CB72A1B is discontinued at DiGi Electronics, while the CB72ABB maintains active product status. Packaging differs (CB72A1B is nonstandard; CB72ABB is supplied in bag format), but electrical and thermal specifications are identical.

Q: Are there any compatibility concerns when substituting CB72ABB for CB72A1B? A: No compatibility concerns exist. Both parts operate within the same voltage, current, and temperature parameters. Regulatory compliance is maintained across both cUL, TUV, and UL certifications.

Q: Does the packaging difference affect electrical performance? A: Packaging format does not affect electrical or thermal performance. The CB72ABB bag packaging is suitable for standard component handling and integration procedures.

Q: Are both parts RoHS compliant? A: Yes. Both CB72A1B and CB72ABB are ROHS3 compliant and REACH unaffected.