CMB-033-11DNN-B-A Equivalent & Substitute Parts

Part Overview

The CMB-033-11DNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and is designed for overcurrent protection in low-voltage 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 design flexibility permits equivalent component selection.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	3A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11DNN-B-A are qualified based on electrical and mechanical parameter alignment. All identified substitutes maintain the following critical parameters:

Current Rating: 3A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
RoHS3 Compliance

The substitute parts are manufactured by OptiFuse under the CBW57 series. These parts operate at a higher DC voltage rating (50V DC versus 32V DC on the main part), which represents an upward-compatible specification. All substitutes carry equivalent regulatory approvals including UL 1077 and UL 1500 certifications.

Parameter Comparison

Parameter	CMB-033-11DNN-B-A (Carling)	CBW57-EJ-3A (OptiFuse)	CBW57-EL4-3A (OptiFuse)	CBW57-ES-3A (OptiFuse)	CBW57-PF-3A-5X (OptiFuse)	CBW57-PS-3A-1X (OptiFuse)
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	3A	3A	3A	3A	3A	3A
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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Regulatory Approvals	CE, cUL, TUV, UL1077, UL1500	cURus, IP 40, SAE J1171, UL 1077, UL 1500	cURus, IP 40, SAE J1171, UL 1077, UL 1500	cURus, IP 40, SAE J1171, UL 1077, UL 1500	cURus, IP 40, SAE J1171, UL 1077, UL 1500	cURus, IP 40, SAE J1171, UL 1077, UL 1500

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitutes are qualified alternatives to the CMB-033-11DNN-B-A based on electrical parameter compatibility and regulatory compliance. The primary distinction among substitute options is the DC voltage rating specification: OptiFuse parts are rated for 50V DC, which exceeds the 32V DC requirement of the Carling part. This higher rating provides operational margin in DC applications.

Regulatory compliance is maintained across all substitutes. While the Carling part carries CE and TUV approvals in addition to UL certifications, the OptiFuse substitutes carry cURus and SAE J1171 approvals alongside equivalent UL 1077 and UL 1500 certifications. All parts maintain ROHS3 compliance and REACH unaffected status.

Selection among the five OptiFuse variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, CBW57-PS-3A-1X) is determined by mechanical packaging requirements and connector interface specifications, which are not differentiated in the provided electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the CMB-033-11DNN-B-A?

A: Yes. All five OptiFuse CBW57 variants meet the electrical requirements: 3A current rating, 250V AC voltage rating, 32V DC minimum voltage rating, panel-mount configuration, thermal breaker type, push-to-reset actuation, and single-pole design. The 50V DC rating on OptiFuse parts exceeds the 32V DC specification of the Carling part.

Q: What is the significance of the higher 50V DC rating on OptiFuse substitutes?

A: The 50V DC rating on OptiFuse parts is an upward-compatible specification. Applications operating at or below 32V DC will function within the qualified operating range of both the original and substitute parts. The higher rating does not affect performance in lower-voltage applications.

Q: Are there differences in regulatory compliance between the main part and substitutes?

A: Both the Carling CMB-033-11DNN-B-A and OptiFuse CBW57 substitutes carry UL 1077 and UL 1500 certifications. The Carling part includes CE and TUV approvals, while OptiFuse parts carry cURus and SAE J1171 approvals. Application requirements determine which certification set is necessary.

Q: Do all five OptiFuse CBW57 variants have identical electrical specifications?

A: Yes. CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X share identical electrical parameters. Differences exist in mechanical packaging and connector interface configurations, indicated by the suffix designations.

Q: What is the inventory status of substitute parts?

A: OptiFuse CBW57 substitutes maintain active stock levels: CBW57-EL4-3A (1358 pcs), CBW57-ES-3A (1289 pcs), CBW57-PS-3A-1X (1120 pcs), CBW57-EJ-3A (1203 pcs), and CBW57-PF-3A-5X (869 pcs). The original Carling CMB-033-11DNN-B-A maintains 1066 pcs in stock.

Q: Are all parts RoHS3 compliant?

A: Yes. The CMB-033-11DNN-B-A and all five OptiFuse CBW57 substitutes are ROHS3 compliant and REACH unaffected.

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