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CMB-203-11CNN-R-A Equivalent & Substitute Parts
Part Overview
The CMB-203-11CNN-R-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A 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 component is RoHS3 compliant and REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers while maintaining equivalent electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CMB-203-11CNN-R-A |
| Manufacturer | Carling Technologies |
| Series | CMB |
| Breaker Type | Thermal |
| Current Rating | 20A |
| 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 |
Substitute Part Grouping Explanation
Substitution of the CMB-203-11CNN-R-A is determined by strict equivalence across the following critical parameters:
Mandatory Matching Parameters:
- Current Rating: 20A
- Voltage Rating - AC: 250V
- Mounting Type: Panel Mount
- Breaker Type: Thermal
- Actuator Type: Push to Reset
- Number of Poles: 1
- Illumination: None
Acceptable Variation:
- Voltage Rating - DC: The CMB-203-11CNN-R-A operates at 32V DC. All identified substitute parts from OptiFuse (CBW57 series) operate at 50V DC, which represents a higher DC voltage capability and is functionally compatible for applications requiring 32V DC operation.
All substitute parts maintain active product status, RoHS3 compliance, and equivalent approval agency certifications (cURus, UL 1077, UL 1500). The CBW57 series from OptiFuse provides direct functional equivalence with enhanced DC voltage rating capability.
Parameter Comparison
| Parameter | CMB-203-11CNN-R-A (Carling) | CBW57-EJ-20A (OptiFuse) | CBW57-EL4-20A (OptiFuse) | CBW57-ES-20A (OptiFuse) | CBW57-ES-20A-5H (OptiFuse) | CBW57-ES-20A-5X (OptiFuse) | CBW57-HS-20A-5X (OptiFuse) | CBW57-HS-20A-C (OptiFuse) | CBW57-PB-20A-WX (OptiFuse) | CBW57-PF-20A-5X (OptiFuse) | CBW57-PL-20A-5X (OptiFuse) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A |
| 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 |
Engineering Selection Recommendations
All listed OptiFuse CBW57 series circuit breakers provide functional equivalence to the CMB-203-11CNN-R-A for 20A thermal protection applications at 250V AC. The primary distinction is the DC voltage rating: the CMB-203-11CNN-R-A is rated for 32V DC, while all CBW57 substitutes are rated for 50V DC. This higher DC rating in the substitute parts ensures compatibility with the original specification and provides additional operational margin in DC applications.
Compliance Considerations:
The CMB-203-11CNN-R-A carries approvals from CE, cUL, TUV, UL1077, and UL1500. The CBW57 series substitutes carry approvals from cURus, IP 40, SAE J1171, UL 1077, and UL 1500. Both product lines maintain UL 1077 and UL 1500 certifications, which are the primary standards for thermal circuit breakers. All substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original part.
Inventory Availability:
The CMB-203-11CNN-R-A has 744 units in stock. The CBW57 series substitutes collectively provide significantly higher inventory availability, ranging from 850 to 2458 units per variant, supporting supply chain continuity and project timelines.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series parts directly replace the CMB-203-11CNN-R-A?
A: Yes. All CBW57 variants listed maintain identical electrical ratings for current (20A), AC voltage (250V), mounting configuration (panel mount), actuation method (push to reset), and pole count (1). The DC voltage rating difference (50V versus 32V) represents a higher capability and does not prevent substitution for 32V DC applications.
Q: What is the significance of the DC voltage rating difference?
A: The CMB-203-11CNN-R-A operates at 32V DC maximum. The CBW57 substitutes operate at 50V DC maximum. A higher DC rating indicates the component can safely operate at the original specification and beyond. This difference does not create incompatibility; rather, it provides additional operational margin.
Q: Are the approval certifications equivalent between the main part and substitutes?
A: Both the CMB-203-11CNN-R-A and CBW57 series maintain UL 1077 and UL 1500 certifications, which are the governing standards for thermal circuit breaker performance and safety. These certifications ensure functional and safety equivalence for thermal protection applications.
Q: Which CBW57 variant should be selected if multiple options are available?
A: All listed CBW57 variants (CBW57-EJ-20A, CBW57-EL4-20A, CBW57-ES-20A, CBW57-ES-20A-5H, CBW57-ES-20A-5X, CBW57-HS-20A-5X, CBW57-HS-20A-C, CBW57-PB-20A-WX, CBW57-PF-20A-5X, CBW57-PL-20A-5X) are electrically and mechanically equivalent. Selection should be based on packaging requirements, lead time, and inventory availability. The suffix designations (EJ, EL4, ES, HS, PB, PF, PL) indicate packaging or connector variations that do not affect core thermal protection functionality.
Q: Is RoHS3 compliance maintained across all substitutes?
A: Yes. The CMB-203-11CNN-R-A and all CBW57 series substitutes are RoHS3 compliant and REACH unaffected, ensuring environmental regulatory alignment across all options.
Q: Can these parts be used interchangeably in existing designs?
A: Yes, provided the panel mount form factor and push-to-reset actuation are compatible with the existing mechanical design. The electrical specifications (20A, 250V AC, 50V DC minimum) ensure functional interchangeability in thermal protection circuits designed for the original CMB-203-11CNN-R-A specification.
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