nb310l-3n-c32 chint rcbo 32a c curve type a 30ma 3 pole + neutral

Why Choose the Chint NB310L-3N-C32 RCBO?

The Chint NB310L-3N-C32 is a combined residual current operated circuit breaker with overcurrent protection (RCBO), offering both earth leakage and short-circuit/overload protection in a single device. Rated at 32 A, with a C-curve tripping characteristic and 30 mA residual sensitivity, it is a versatile and compact solution for three-phase plus neutral (3P+N) circuits. As a Type A RCBO, it provides reliable protection against sinusoidal AC and pulsating DC earth leakage currents, making it compliant with the latest safety requirements for residential, commercial, and light industrial installations.

By combining the functions of an MCB and RCD into one device, the NB310L-3N-C32 reduces panel space, simplifies installation, and ensures comprehensive circuit protection—all while meeting IEC/EN standards for safety and performance.

Key Features

• RCBO combining MCB and RCD functionality in one compact unit.
• Rated current: 32 A.
• C-curve tripping characteristic—ideal for general-purpose and inductive loads.
• Residual sensitivity: 30 mA for additional protection against electric shock.
• Type A—detects sinusoidal AC and pulsating DC leakage currents.
• 3 pole + neutral (3P+N) configuration for balanced three-phase protection.
• Breaking capacity typically 6 kA for dependable circuit protection.
• DIN-rail modular mounting for easy installation.
• Meets IEC/EN 61009 standards for RCBOs.

Technical Specifications

• Manufacturer: Chint
• Series: NB310L RCBO
• Model: NB310L-3N-C32
• Device Type: RCBO (MCB + RCD)
• Rated Current (In): 32 A
• Poles: 3P+N
• Tripping Curve: C curve
• Residual Current Sensitivity (IΔn): 30 mA
• RCD Type: Type A
• Breaking Capacity: 6 kA (typical)
• Standards: IEC/EN 61009
• Mounting: Modular DIN rail

Certifications

Complies with IEC/EN 61009 standards for RCBOs. CE marked for EU installations and suitable for BS 7671-compliant wiring systems requiring Type A devices for enhanced safety.

Comparison with Other Protective Devices

Unlike a separate MCB and RCD combination, the NB310L-3N-C32 integrates both functions in one unit. This reduces wiring complexity, saves DIN-rail space, and ensures faster fault response compared to traditional two-device setups.

Frequently Asked Questions

• What is an RCBO?
• Why choose Type A instead of Type AC?
• What does C-curve mean?
• Is installation straightforward?

Applications

• Residential distribution boards needing individual RCBO protection.
• Commercial circuits requiring combined overload and earth leakage protection.
• Light industrial three-phase circuits with neutral.
• Protection of socket outlets, lighting, and small machinery circuits.

Customer Reviews

Overall rating: 5 Star Product

"Space-saving and reliable RCBO—ideal for upgrading old distribution boards." – Paul K., Electrician – 5 Star Product

"Easy to fit and provides complete protection in one module. Great value." – Emily R., Installer – 5 Star Product