CMB-103-27J8N-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-103-27J8N-B-A 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 with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified when equivalent electrical and mechanical parameters are required for applications demanding alternative sourcing, inventory availability, or design flexibility while maintaining identical functional performance and safety certifications.

Key Parameters

Parameter	Value
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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-103-27J8N-B-A are qualified based on strict electrical and mechanical parameter equivalence. All identified substitutes maintain the following critical parameters:

Current Rating: 10A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
RoHS3 Compliance

All substitute parts are manufactured by OptiFuse under the CBW57 series. The DC voltage rating for substitute parts is 50V, which exceeds the 32V DC specification of the main part. This higher DC rating does not restrict substitution, as the substitute parts remain fully compatible with applications rated at or below 32V DC. All substitutes carry equivalent regulatory approvals including cURus, UL 1077, and UL 1500 certifications.

Parameter Comparison

Parameter	CMB-103-27J8N-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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and full ROHS3 compliance. The CBW57 series from OptiFuse carries regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which align with or exceed the approval standards of the CMB-103-27J8N-B-A (CE, cUL, TUV, UL1077, UL1500).

The primary distinction among substitute parts lies in packaging configuration and inventory availability. All CBW57 variants are supplied in Bulk packaging with Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture-related storage restrictions. Inventory levels vary across part numbers, with CBW57-PS-10A-5X offering the highest availability at 5,818 pieces.

Selection among substitute parts should be based on specific packaging requirements and lead-time considerations, as all variants are electrically and mechanically equivalent for the intended application.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-103-27J8N-B-A?

A: Yes. All CBW57 variants listed maintain identical electrical specifications for current rating (10A), AC voltage (250V), mounting type (panel mount), actuator type (push to reset), and pole configuration (single pole). The higher DC voltage rating (50V versus 32V) of the CBW57 series does not restrict substitution for applications operating at or below 32V DC.

Q: What is the significance of the different CBW57 part number suffixes?

A: The suffixes (such as -EJ, -EL4, -ES, -PB, -PF, -PL, -PS) denote internal configuration variations and packaging specifications. These designations do not affect the core electrical performance or safety certifications relevant to circuit breaker functionality. Selection should be based on specific packaging and availability requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified CBW57 substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the CMB-103-27J8N-B-A.

Q: What certifications do the substitute parts carry?

A: CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications align with the regulatory requirements of the original part, which includes CE, cUL, TUV, UL1077, and UL1500 approvals.

Q: Is there a difference in performance between the various CBW57 part numbers?

A: No. All CBW57 variants specified maintain identical electrical and mechanical performance characteristics. Differences are limited to internal construction details and packaging configurations that do not affect functional operation or safety performance.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All CBW57 substitute parts carry MSL 1 (Unlimited), indicating no moisture-related storage or handling restrictions. This provides maximum flexibility for inventory management and supply chain handling.

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