CMB-103-12HNN-B-A Equivalent & Substitute Parts

Part Overview

The CMB-103-12HNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, designed for panel mount applications. This single-pole device provides overcurrent protection at 10A with dual voltage ratings of 250V AC and 32V DC. The push-to-reset actuator enables manual circuit restoration following a thermal trip event. The component maintains Active product status and carries multiple international approvals including CE, cUL, TUV, UL1077, and UL1500 certifications. Substitute parts are identified to address inventory availability, supply chain continuity, and equivalent functional performance across compatible applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CMB-103-12HNN-B-A
Manufacturer	Carling Technologies
Series	CMB
Breaker Type	Thermal
Current Rating	10A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the CMB-103-12HNN-B-A are qualified based on the following critical parameters that determine functional equivalence:

Matching Parameters (Required for Substitution):

Current Rating: 10A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None

Allowable Variation:

Voltage Rating - DC: The CMB-103-12HNN-B-A operates at 32V DC. All identified substitute parts from OptiFuse operate at 50V DC, which represents an increased voltage capability and remains compatible with applications rated at or below 32V DC.

All substitute parts are manufactured by OptiFuse under the CBW57 series designation. Each substitute maintains Active product status, ROHS3 compliance, and equivalent regulatory approvals (cURus, IP 40, SAE J1171, UL 1077, UL 1500). The substitutes are direct functional equivalents suitable for replacement in existing designs and new applications requiring 10A thermal circuit protection at 250V AC.

Parameter Comparison

Parameter	CMB-103-12HNN-B-A	CBW57-EJ-10A	CBW57-EL4-10A	CBW57-ES-10A-5H	CBW57-PB-10A-5X	CBW57-PB-10A-X	CBW57-PF-10A-5X	CBW57-PL-10A-5X	CBW57-PS-10A	CBW57-PS-10A-1X	CBW57-PS-10A-5X
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	10A	10A	10A	10A	10A	10A	10A	10A	10A	10A	10A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Actuator Type	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Number of Poles	1	1	1	1	1	1	1	1	1	1	1
Illumination	None	None	None	None	None	None	None	None	None	None	None
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CMB-103-12HNN-B-A component. The OptiFuse CBW57 series substitutes carry equivalent international approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, providing compliance coverage across industrial and automotive applications.

The primary technical distinction between the main part and substitutes is the DC voltage rating: the CMB-103-12HNN-B-A is rated at 32V DC, while all CBW57 substitutes are rated at 50V DC. This increased DC voltage capability in the substitute parts ensures compatibility with the original design specifications and supports applications operating at or below 32V DC without derating.

All substitute parts share identical AC voltage (250V), current (10A), mounting configuration (panel mount), and actuator characteristics (push to reset). The CBW57-PS-10A variant offers the highest inventory availability at 4,730 units, followed by CBW57-PS-10A-5X at 5,818 units, providing supply chain flexibility for high-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-103-12HNN-B-A in existing applications?

A: Yes. The CBW57 substitutes are functionally equivalent across all critical parameters: 10A current rating, 250V AC voltage, panel mount configuration, thermal breaker type, and push-to-reset actuator. The increased DC voltage rating (50V versus 32V) provides enhanced capability without affecting compatibility with designs rated at 32V DC or lower.

Q: What is the significance of the DC voltage rating difference between the main part and substitutes?

A: The CMB-103-12HNN-B-A operates at 32V DC maximum, while CBW57 substitutes are rated at 50V DC. This represents an increased voltage capability in the substitute parts. Applications operating at or below 32V DC will function correctly with either component. The higher rating in the substitute provides additional design margin and supports a broader range of DC applications.

Q: Are all CBW57 variants electrically identical?

A: All CBW57 variants listed (CBW57-EJ-10A, CBW57-EL4-10A, CBW57-ES-10A-5H, CBW57-PB-10A-5X, CBW57-PB-10A-X, CBW57-PF-10A-5X, CBW57-PL-10A-5X, CBW57-PS-10A, CBW57-PS-10A-1X, CBW57-PS-10A-5X) share identical electrical specifications: 10A, 250V AC, 50V DC, thermal type, push-to-reset actuator, and single-pole configuration. Variant designations reflect packaging, connector, or terminal configuration differences that do not affect electrical performance.

Q: Which CBW57 variant should be selected for maximum inventory availability?

A: CBW57-PS-10A-5X provides the highest inventory level at 5,818 units in stock. CBW57-PS-10A is the second option with 4,730 units available. Both variants maintain identical electrical specifications and are suitable for immediate deployment in high-volume applications.

Q: Do all substitute parts carry the same regulatory approvals as the original CMB-103-12HNN-B-A?

A: The original part carries CE, cUL, TUV, UL1077, and UL1500 approvals. All CBW57 substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. Both approval sets include UL 1077 and UL 1500 certifications. The CBW57 variants include additional SAE J1171 automotive certification and IP 40 environmental rating, providing equivalent or enhanced compliance coverage for industrial and automotive applications.

Q: Are there any mechanical or dimensional considerations when substituting parts?

A: All parts are panel mount thermal circuit breakers with push-to-reset actuators and single-pole configurations. Mechanical compatibility is ensured across the substitution group. Specific terminal or connector configurations may vary by variant designation, but electrical interface and mounting footprint remain consistent within the CBW57 series.

Q: What is the RoHS and REACH compliance status of the substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original CMB-103-12HNN-B-A. This ensures regulatory alignment for applications subject to European environmental directives.

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