CMB-103-27GNN-B-A Equivalent & Substitute Parts

Part Overview

The CMB-103-27GNN-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. The part is RoHS3 compliant and REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design flexibility permits equivalent functionality.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Part Number	CMB-103-27GNN-B-A
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-103-27GNN-B-A are qualified based on the following critical parameters that must align with the original specification:

Mandatory Matching Parameters:

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-103-27GNN-B-A operates at 32V DC. All identified substitute parts from OptiFuse (CBW57 series) operate at 50V DC. This represents an upward voltage rating compatibility, as a component rated for higher DC voltage can operate safely in applications specified for lower DC voltage.

All substitute parts are manufactured by OptiFuse under the CBW57 series designation and maintain active product status with equivalent regulatory approvals (cURus, UL 1077, UL 1500) and RoHS3 compliance.

Parameter Comparison

Parameter	CMB-103-27GNN-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
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Not Specified	Not Specified	Not Specified	Not Specified	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All identified substitute parts maintain functional equivalence to the CMB-103-27GNN-B-A across the critical electrical and mechanical parameters. Selection among the CBW57 series alternatives should be based on the following factors:

Regulatory Compliance: All substitute parts hold active product status and comply with RoHS3 requirements. The CBW57 series carries cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which overlap with the original part's CE, cUL, TUV, UL1077, and UL1500 approvals.

Inventory Availability: The CBW57-PS-10A-5X variant offers the highest inventory level at 5,818 pieces, followed by CBW57-ES-10A-5H at 3,044 pieces. The CBW57-PS-10A base variant provides 4,730 pieces. These options support high-volume procurement requirements.

DC Voltage Rating: All substitute parts are rated for 50V DC, which exceeds the original 32V DC specification. This upward rating compatibility ensures safe operation in the original application without derating concerns.

Packaging and Configuration: The CBW57 series includes multiple configuration variants denoted by suffix codes (EJ, EL4, ES, PB, PF, PL, PS). These variants reflect different connector, terminal, or packaging configurations. Selection should align with the specific mechanical interface requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-103-27GNN-B-A in existing designs?

A: Yes. All CBW57 variants listed maintain identical electrical ratings (10A, 250V AC) and mechanical form factors (panel mount, push-to-reset, single-pole, non-illuminated). The 50V DC rating of the CBW57 series exceeds the 32V DC requirement of the original part, ensuring compatibility in DC applications.

Q: What is the significance of the suffix codes in the CBW57 part numbers?

A: The suffix codes (EJ, EL4, ES, PB, PF, PL, PS) denote different mechanical configurations, terminal types, or connector styles within the CBW57 series. These variations do not affect the electrical performance but determine physical compatibility with specific panel cutouts and terminal connections. Consult mechanical drawings to confirm the appropriate variant for your application.

Q: Are all CBW57 variants RoHS3 compliant?

A: Yes. All listed CBW57 substitute parts are RoHS3 compliant. Most variants also carry REACH Unaffected status, matching the environmental compliance profile of the original CMB-103-27GNN-B-A.

Q: What regulatory approvals do the CBW57 parts carry?

A: The CBW57 series holds cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These approvals provide equivalent or overlapping coverage with the original part's CE, cUL, TUV, UL1077, and UL1500 designations for thermal circuit breaker applications.

Q: Why do all substitute parts have a higher DC voltage rating (50V vs. 32V)?

A: The CBW57 series is designed with a higher DC voltage rating as a standard specification. This does not create incompatibility; rather, it provides additional safety margin in DC applications. A component rated for 50V DC operates safely at 32V DC without performance degradation.

Q: Which CBW57 variant should I select for new designs?

A: Selection depends on the mechanical interface requirements of your application. The CBW57-PS-10A-5X and CBW57-PS-10A variants offer the highest inventory availability. Consult the mechanical specifications and terminal configuration requirements to determine the appropriate suffix code for your panel mount installation.

Q: Is there a difference in thermal performance between the CMB-103-27GNN-B-A and CBW57 substitutes?

A: Both the original part and all substitute variants are thermal circuit breakers with identical current ratings (10A). Thermal performance characteristics are determined by the breaker type and current rating, which are identical across all parts listed. No performance difference is expected in thermal response or trip characteristics.

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