CHINT NB310L(3PN) Residual Current Operated Circuit Breaker

Name: CHINT NB310L(3PN) Residual Current Operated Circuit Breaker
Brand: CHINT

Brand Name: CHINT
Product Type: Residual Current Operated Circuit Breaker
Model: NB310L(3PN)
Rated Voltage: AC 230V/400V, 6A-63A
Application: Residual current circuit breaker for low-voltage distribution panels

Tripping Curve

Residual Current

Description

CHINT NB310L(3PN) is an original CHINT residual current operated circuit breaker (RCBO) designed for AC 230V/400V, 6A-40A applications. It provides reliable protection against earth leakage faults, overcurrent and short circuit conditions in low-voltage power distribution systems.

1. Product Overview

The NB310L(3PN) RCBO offers comprehensive protection with residual current detection and circuit breaking capabilities. It is suitable for residential, commercial and industrial electrical installations requiring protection against electric shock and fire hazards.

2. Main Features

Original CHINT NB310L(3PN) residual current circuit breaker
Product type: Residual Current Operated Circuit Breaker
Rated voltage: AC 230V/400V, 6A-40A
Earth leakage protection
Overcurrent and short circuit protection
Compact design for DIN rail mounting
Suitable for distribution boards and panel installations

3. Technical and Application Notes

Please confirm the rated current, residual current rating, breaking capacity and pole configuration before ordering. Selection should comply with local electrical regulations and installation requirements.

4. Typical Applications

Residential electrical distribution
Commercial building panels
Industrial power distribution
Outdoor and damp location installations
Project and wholesale supply

5. Ordering Support

Send us the rated current, residual current rating, breaking capacity, pole number and target market, and we can help confirm the correct CHINT RCBO for your project.

6. Product Catalog

Product catalog images are available in the gallery above.

Additional information

Residual Current	30mA, 100mA, 300mA
Tripping Curve	B, C, D

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NB310L(3PN) Residual Current Operated Circuit Breaker.

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Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

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2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Voltage & Load Sizing

How to verify rated operational voltage, frequency, and load duty cycle?

Verify that the nominal line voltage (AC 230V single-phase or 400V/415V/690V three-phase at 50/60Hz, or DC voltage ratings) falls within the continuous maximum operating limits of the device. Check duty cycle ratings (continuous vs intermittent duty) to ensure thermal stability under full load.

Protection & Environment

What ingress protection (IP Rating) and environmental enclosures are recommended?

For clean indoor electrical rooms, standard IP20 modular DIN-rail housings are recommended. For outdoor, industrial washdown, or dusty environments, mount components inside weatherproof enclosures rated IP65/IP66 with UV-resistant polycarbonate or powder-coated steel enclosures equipped with compression cable glands.

Selectivity & Grading

How to ensure upstream and downstream coordination in power distribution boards?

Ensure proper discrimination by grading current thresholds and tripping time delays: upstream devices should have higher current ratings and intentional short-time delays (Class S), allowing downstream branch MCBs to clear localized faults without blacking out the entire facility.

Installation & Mounting

What mounting rails, busbars, and spatial clearances are required?

Components mount on standard symmetrical 35mm DIN rail (EN 60715 / TH35-7.5) or backplate screw fixings. Maintain recommended top/bottom ventilation gaps (typically 30–50mm) to ensure unrestricted air convection, and use standard pin/fork comb busbars to minimize contact resistance and wiring errors.

Conductor & Torque Sizing

What conductor sizes and terminal tightening torques should be applied?

Select copper or aluminum conductor cross-sections complying with IEC 60364-5-52 current-carrying capacity tables based on continuous load. Always use a calibrated torque screwdriver or torque wrench to tighten terminal screws to the manufacturer-specified torque to prevent hot-spot degradation and loose connections.