Live Electrical CN140B 40A B Curve Double Pole Bi-Directional MCB for SRN Consumer Units

40A 2 Pole Bi-Directional B Curve MCB for Compatible Live Electrical SRN Consumer Units

The Live Electrical CN140B is a 40A B Curve double pole bi-directional miniature circuit breaker (MCB) designed specifically for compatible Live Electrical SRN consumer units and double pole busbar arrangements.

Rated at 230V with a 6kA fault current rating, the CN140B provides overcurrent protection for appropriately designed 40A circuits. Its 2P configuration and bi-directional operation make it purpose-designed for the compatible Live Electrical SRN distribution system.

The CN140B should be used with the appropriate Live Electrical SRN consumer unit and compatible double pole busbar arrangement, rather than being treated as a universal MCB for unrelated consumer units.

Features

• Live Electrical CN140B
• 40A Current Rating
• B Curve Tripping Characteristic
• Double Pole / 2P Configuration
• Bi-Directional MCB
• 6kA Fault Current Rating
• 230V Rated
• Miniature Circuit Breaker
• Provides Overcurrent Protection
• Designed for Live Electrical SRN Consumer Units
• Compatible with Appropriate Live Electrical SRN Busbars
• Suitable for Compatible Double Pole Busbar Arrangements
• Suitable for Appropriately Designed 40A Circuits
• Purpose-Designed SRN Consumer Unit Protective Device
• Ideal as a Compatible Replacement or Additional SRN MCB

40A Current Rating

The CN140B has a rated current of 40A, making it suitable for appropriately designed circuits requiring a 40A protective device.

A 40A MCB can be used for a range of higher-load final circuit applications where its electrical characteristics have been determined to be appropriate.

The correct protective-device rating must always be established according to the connected load, conductor size, installation method, circuit characteristics and applicable wiring requirements.

The 40A rating should therefore be selected as part of the electrical circuit design rather than solely according to the equipment being connected.

B Curve Tripping Characteristic

The CN140B features a B Curve tripping characteristic.

B Curve MCBs are commonly specified for appropriate domestic and light commercial circuits where relatively low inrush currents are expected.

The required curve should always be selected according to the characteristics of the connected equipment and the overall circuit design.

Double Pole / 2P Configuration

The Live Electrical CN140B is a 2 pole device, designed for the compatible double pole arrangement used within the Live Electrical SRN consumer unit system.

Its double pole format distinguishes it from conventional single-pole MCBs and makes correct compatibility with the consumer unit and busbar particularly important.

When adding or replacing a protective device, the existing board should therefore be confirmed as a compatible Live Electrical SRN consumer unit using the appropriate busbar arrangement.

Bi-Directional Operation

The CN140B is bi-directional, allowing operation with current flow in either direction where required by the compatible electrical installation.

Bi-directional capability is an increasingly useful characteristic in modern electrical distribution systems where power flow may not always follow the traditional single-direction arrangement.

This capability does not make the CN140B universally interchangeable with other MCB ranges. Compatibility with the Live Electrical SRN system remains essential.

Designed for Live Electrical SRN Consumer Units

The CN140B is specifically designed for compatible Live Electrical SRN consumer units.

Protective devices should not be assumed to be interchangeable between different consumer unit manufacturers or ranges simply because they share similar current ratings or physical dimensions.

The CN140B should therefore be paired with the appropriate Live Electrical SRN consumer unit and compatible double pole busbar system.

Compatible with SRN Double Pole Busbar Arrangements

The device is designed for use with the appropriate Live Electrical SRN double pole busbar arrangement.

This matched system ensures the protective device is used within the consumer unit architecture for which it has been designed.

Customers purchasing the CN140B as a replacement or additional MCB should check their existing consumer unit model and busbar configuration before ordering.

6kA Fault Current Rating

The CN140B has a 6kA fault current rating.

The breaking capacity is an important electrical characteristic when selecting a miniature circuit breaker and must be considered alongside the prospective fault current and overall electrical installation design.

230V Rated

The Live Electrical CN140B is rated at 230V, making it suitable for its intended low-voltage electrical distribution application within compatible SRN installations.

The circuit voltage, prospective fault current, conductor characteristics and connected equipment should all be considered when selecting the correct protective device.

MCB Overcurrent Protection

As a miniature circuit breaker, the CN140B is designed to provide overcurrent protection for an appropriately designed electrical circuit.

It is important not to confuse an MCB with an RCBO.

The CN140B provides MCB functionality and should not be described as providing 30mA residual-current protection.

Where residual-current protection is required, the complete circuit protection arrangement must provide this through the appropriate RCD, RCBO or other specified device.

Suitable for Appropriately Designed 40A Circuits

The CN140B can be used where an electrical circuit has been designed to require a 40A B Curve MCB and is installed within a compatible Live Electrical SRN consumer unit.

Potential applications depend on the complete electrical design.

When selecting the protective device, consideration should be given to:

• Circuit design current
• Cable size
• Cable current-carrying capacity
• Installation method
• Connected load
• Inrush characteristics
• Voltage drop
• Prospective fault current
• Required disconnection times
• Required MCB tripping curve
• Applicable BS 7671 requirements

The 40A rating alone should not be used to determine suitability for a particular appliance or circuit.

Ideal as a Compatible SRN Replacement or Additional MCB

The CN140B provides a convenient option when adding an appropriately rated circuit to a compatible SRN consumer unit or replacing an existing compatible protective device.

When specifying a replacement, it is important to match not only the 40A current rating and B Curve characteristic, but also the 2P configuration, bi-directional operation and SRN busbar compatibility.

Using the complete CN140B product code helps ensure the correct device is selected.

• Brand: Live Electrical
• Product Code: CN140B
• Product Type: Miniature Circuit Breaker (MCB)
• Series Compatibility: Live Electrical SRN Consumer Units
• Current Rating: 40A
• Tripping Curve: B Curve
• Number of Poles: 2P / Double Pole
• Directionality: Bi-Directional
• Fault Current Rating: 6kA
• Rated Voltage: 230V
• Busbar Compatibility: Compatible Live Electrical SRN Double Pole Busbar Arrangement
• Application: Circuit Overcurrent Protection
• Consumer Unit Compatibility: Live Electrical SRN Consumer Units Only

Important Compatibility Information

The Live Electrical CN140B is intended specifically for compatible Live Electrical SRN consumer units and double pole busbar arrangements.

It should not be treated as a universal 40A MCB for use with arbitrary consumer units.

CN106B vs CN125B vs CN132B vs CN140B

The Live Electrical CN B Curve SRN MCB range provides different current ratings for appropriately designed circuits:

• CN106B – 6A B Curve Double Pole Bi-Directional MCB
• CN125B – 25A B Curve Double Pole Bi-Directional MCB
• CN132B – 32A B Curve Double Pole Bi-Directional MCB
• CN140B – 40A B Curve Double Pole Bi-Directional MCB

The CN140B is the 40A version and should be selected only where the electrical circuit has been designed for a 40A B Curve protective device.

Suitable Applications

• Live Electrical SRN Consumer Units
• Compatible Live Electrical SRN Distribution Equipment
• Compatible Double Pole Busbar Arrangements
• Appropriately Designed 40A Circuits
• Domestic Electrical Installations
• Residential Electrical Distribution
• Appropriate Higher-Load Final Circuits
• New-Build Electrical Installations
• Consumer Unit Upgrades
• Replacement SRN Protective Devices
• Additional SRN Consumer Unit Circuits
• Appropriate Commercial Electrical Installations
• Circuits Requiring a 40A B Curve MCB

Why Choose the Live Electrical CN140B?

The Live Electrical CN140B provides a purpose-designed solution when a 40A B Curve double pole bi-directional MCB is required for a compatible Live Electrical SRN consumer unit.

Its 40A current rating and B Curve characteristic make it suitable for appropriately designed circuits requiring these protective characteristics, while its 2P configuration is designed around the compatible SRN double pole arrangement.

The device's bi-directional operation also allows current flow in either direction where required by the design of the compatible electrical installation.

With a 6kA fault current rating and 230V rating, the CN140B provides the core electrical characteristics required for its intended circuit protection application.

Most importantly, it is intended for the Live Electrical SRN consumer unit and compatible double pole busbar system, helping installers and customers identify the correct protective device instead of relying on a visually similar MCB intended for another consumer unit range.

For compatible SRN installations requiring a 40A double pole B Curve bi-directional MCB, the Live Electrical CN140B provides a practical, purpose-designed solution.