CMB-103-12H2N-W-D Equivalent & Substitute Parts

Part Overview

The CMB-103-12H2N-W-D is a thermal circuit breaker manufactured by Carling Technologies, rated for 10A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and holds Active product status. The breaker is certified to CE, cUL, TUV, UL1077, and UL1500 standards and is ROHS3 compliant. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers or packaging configurations.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Part Number	CMB-103-12H2N-W-D
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-103-12H2N-W-D 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 main part specifies 32V DC. Substitute parts from OptiFuse (CBW57 series) are rated for 50V DC, which provides enhanced DC voltage capability and remains compatible with applications requiring 32V DC operation.

All substitute parts are manufactured by OptiFuse under the CBW57 series designation. Each substitute maintains Active product status, ROHS3 compliance, and REACH Unaffected status. Substitute parts are available in Bulk packaging and carry equivalent regulatory certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals.

Parameter Comparison

Parameter	CMB-103-12H2N-W-D	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
Series	CMB	CBW57	CBW57	CBW57	CBW57	CBW57	CBW57	CBW57	CBW57	CBW57	CBW57
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
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed substitute parts maintain functional equivalence to the CMB-103-12H2N-W-D across critical electrical and mechanical parameters. Selection among substitute options should be based on the following factors:

Regulatory Compliance: The CMB-103-12H2N-W-D carries CE, cUL, TUV, UL1077, and UL1500 certifications. All OptiFuse CBW57 series substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets of certifications satisfy industrial and commercial circuit protection standards.

Product Availability: All substitute parts maintain Active product status with current inventory levels ranging from 701 to 5818 units. CBW57-PS-10A-5X offers the highest inventory availability at 5818 units, followed by CBW57-PS-10A at 4730 units.

DC Voltage Enhancement: OptiFuse CBW57 series parts are rated for 50V DC compared to the 32V DC rating of the CMB-103-12H2N-W-D. This higher DC voltage rating provides additional operational margin in DC applications while maintaining full compatibility with 32V DC circuit requirements.

Environmental Compliance: All substitute parts are ROHS3 compliant and REACH Unaffected, matching the environmental standards of the original part.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-103-12H2N-W-D?

A: Yes. All listed OptiFuse CBW57 series parts are parametric equivalents. They share identical current ratings (10A), AC voltage ratings (250V), mounting configuration (panel mount), actuation method (push to reset), and pole count (1). The 50V DC rating of OptiFuse parts exceeds the 32V DC requirement of the original part, providing enhanced capability.

Q: What is the significance of the different part number suffixes in the CBW57 series (such as -EJ, -EL4, -ES, -PB, -PF, -PL, -PS)?

A: The suffixes denote internal configuration variations within the CBW57 series. All variants listed maintain identical electrical specifications (10A, 250V AC, 50V DC) and mechanical form factors (panel mount, push to reset, single pole). Selection among variants should be based on application-specific requirements and inventory availability.

Q: Are there any certifications or approvals that differ between the CMB-103-12H2N-W-D and the OptiFuse substitutes?

A: The CMB part carries CE, cUL, TUV, UL1077, and UL1500 certifications. OptiFuse CBW57 parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both certification sets are recognized for industrial circuit protection applications. UL 1077 and UL 1500 certifications are common to both manufacturers.

Q: What is the difference between bulk packaging and other packaging options?

A: All substitute parts are supplied in Bulk packaging. The original CMB-103-12H2N-W-D does not specify a packaging designation. Bulk packaging is standard for industrial component distribution and does not affect electrical or mechanical performance.

Q: Which OptiFuse CBW57 variant should be selected for new designs?

A: CBW57-PS-10A-5X is recommended for new designs based on highest inventory availability (5818 units) and established market presence. However, all listed variants are functionally equivalent and may be selected based on supply chain considerations or specific application requirements.

Q: Is the higher DC voltage rating (50V vs. 32V) of OptiFuse parts a concern for 32V DC applications?

A: No. A higher voltage rating indicates the component can safely operate at higher voltages than required. In 32V DC applications, the 50V DC rated OptiFuse parts operate well within their specifications and provide additional safety margin.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, for applications currently using the CMB-103-12H2N-W-D. The identical current rating, AC voltage rating, mounting type, actuation method, and pole count ensure mechanical and electrical compatibility. The enhanced DC voltage rating of OptiFuse parts does not create compatibility issues.

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