CMB-083-12H3N-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-083-12H3N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 8A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and is designed for overcurrent protection in industrial and commercial applications. The part maintains Active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative suppliers.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	8A
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-083-12H3N-B-A are qualified based on the following critical parameters that determine functional equivalence:

Matching Parameters:

Current Rating: 8A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None
RoHS Compliance: ROHS3 Compliant

Allowable Variance:

Voltage Rating - DC: Substitute parts rated at 50V DC exceed the minimum requirement of 32V DC, providing enhanced capability within the same application envelope.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and maintain Active product status with equivalent regulatory approvals (cURus, UL 1077, UL 1500).

Parameter Comparison

Parameter	CMB-083-12H3N-B-A (Carling)	CBW57-AS-8A (OptiFuse)	CBW57-EJ-8A (OptiFuse)	CBW57-HS-8A (OptiFuse)	CBW57-PB-8A-5X (OptiFuse)	CBW57-PS-8A-5X (OptiFuse)
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	8A	8A	8A	8A	8A	8A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V
Mounting Type	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
Number of Poles	1	1	1	1	1	1
Illumination	None	None	None	None	None	None
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts satisfy the electrical and mechanical requirements for direct replacement of the CMB-083-12H3N-B-A. Selection among substitute options should be based on the following factors:

Regulatory Compliance: All substitute parts carry UL 1077 and UL 1500 certifications, meeting the same safety standards as the primary part. The CBW57 series additionally carries cURus and SAE J1171 approvals.

Inventory Availability: Substitute parts demonstrate varying stock levels:

CBW57-HS-8A: 3442 units
CBW57-AS-8A: 1145 units
CBW57-PB-8A-5X: 1332 units
CBW57-PS-8A-5X: 1096 units
CBW57-EJ-8A: 1027 units

DC Voltage Rating Enhancement: All substitute parts are rated for 50V DC, exceeding the 32V DC requirement of the primary part. This provides additional operational margin in DC applications without compromising AC performance.

Moisture Sensitivity: All OptiFuse CBW57 variants carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling CMB-083-12H3N-B-A?

A: Yes. All five OptiFuse CBW57 variants meet the critical electrical parameters: 8A current rating, 250V AC voltage rating, 32V DC minimum voltage rating, single-pole configuration, thermal breaker type, push-to-reset actuation, and panel-mount form factor. All parts are ROHS3 compliant and carry equivalent UL certifications.

Q: What is the significance of the higher 50V DC rating on substitute parts?

A: The substitute parts are rated for 50V DC compared to the primary part's 32V DC rating. This higher rating provides additional operational capability and margin in DC applications. The parts remain fully compatible with 32V DC circuits and all lower voltage applications.

Q: Are there packaging differences between the substitute parts?

A: All substitute parts are supplied in Bulk packaging. The designations "-5X" in part numbers CBW57-PB-8A-5X and CBW57-PS-8A-5X indicate packaging configuration variants within the OptiFuse CBW57 series but do not affect electrical or mechanical compatibility.

Q: Do all substitute parts carry the same regulatory approvals?

A: All substitute parts carry cURus, UL 1077, and UL 1500 certifications. The primary part carries CE, cUL, TUV, UL1077, and UL1500 approvals. Both sets of certifications satisfy industrial and commercial safety requirements.

Q: What is the moisture sensitivity level of substitute parts?

A: All OptiFuse CBW57 variants carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints. Parts can be stored and handled without special moisture control measures.

Q: How should I select among the five substitute options?

A: Selection should be based on inventory availability and any specific application requirements. All five parts are electrically and mechanically equivalent. CBW57-HS-8A offers the highest stock availability at 3442 units.

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