NI 1 RCCB 2 Pole 10kA (AC Type)

A. Product Overview

CHINT NL1-63 is a residual current circuit breaker (RCCB) designed to disconnect supply when earth leakage current exceeds a preset threshold. The 2-pole AC Type variant is intended for single-phase systems (phase + neutral) and is commonly applied in industrial, commercial, and utility distribution boards.
This RCCB provides protection against indirect contact and leakage-related fire risks, but it does not provide overload or short-circuit protection on its own. Therefore, it is always used in coordination with an upstream or downstream MCB/MCCB. The NL1-63 series is aligned with IEC/EN 61008 standards and supports standardized DIN-rail installation practices.

B. Working Principle

The RCCB continuously compares the current flowing through the phase and neutral conductors using a differential current transformer. Under normal conditions, the currents are equal and cancel each other.
When an earth leakage occurs—due to insulation failure, moisture ingress, or human contact—the imbalance exceeds the rated residual operating current, causing the RCCB to trip and disconnect the circuit.
AC-type RCCBs are sensitive to pure sinusoidal alternating leakage currents, which are typical in conventional AC loads without electronic rectification.

C. Key Applications

• Oil & Gas: Utility power circuits in non-hazardous areas, lighting and socket feeders

• Chemical & Process: Personnel protection in control rooms and auxiliary distribution boards

• Power & Utilities: Station service boards and maintenance power outlets

• Pharma: Cleanroom utility distribution, AHU, and service panels

• Food & Beverage: Processing area utilities and wash-down zone feeders

• Water & Wastewater: Pump house utility DBs and operator service points

• HVAC & Utilities: Single-phase HVAC auxiliaries and maintenance circuits

• Commercial & Infrastructure: Building services, lighting, and socket protection

D. Why Industries Use This Product

Earth leakage faults are a major cause of electric shock incidents and electrical fires. The NL1-63 RCCB provides fast disconnection when leakage occurs, significantly reducing risk to personnel and equipment.
Industries use RCCBs to meet electrical safety practices, insurance requirements, and statutory compliance. If earth leakage protection is omitted or incorrectly selected, faults may remain undetected, leading to shock hazards, nuisance tripping elsewhere, or fire due to prolonged leakage currents. Proper coordination with MCBs ensures both personnel safety and system reliability.

E. Suitable Buyers

• OEMs: Panel builders integrating personnel protection into standard DB designs

• EPC Contractors: Electrical safety compliance in industrial and commercial projects

• Maintenance & Utilities Teams: Commonly used for replacement in standardized RCCB-based panels

• Plant Engineering & Procurement: Preferred in retrofit projects to upgrade safety without major panel redesign

Quick Answers

What is CHINT NL1-63 2-Pole RCCB?
It is a residual current circuit breaker used to detect earth leakage and disconnect single-phase AC circuits to protect people and equipment.

Where is the NL1-63 RCCB used?
Used in industrial and commercial distribution boards for lighting, sockets, utilities, and auxiliary single-phase circuits.

Why is NL1-63 RCCB required in industry?
It prevents electric shock and leakage-related fire hazards that cannot be detected by MCBs or MCCBs alone.

Who typically uses NL1-63 RCCB?
Panel builders, EPC contractors, maintenance teams, and industrial procurement engineers.

FAQ Section

1) Does the NL1-63 RCCB provide overload or short-circuit protection?
No. An RCCB only detects earth leakage. It must be used with an MCB or MCCB to provide overload and short-circuit protection for the circuit.

2) What does AC Type RCCB mean?
AC-type RCCBs are designed to detect sinusoidal alternating leakage currents. They are suitable for conventional AC loads without electronic power supplies or rectifiers.

3) Is a 2-pole RCCB suitable for three-phase systems?
No. A 2-pole RCCB is intended for single-phase circuits only. Three-phase systems require a 4-pole RCCB for complete protection.

4) What are common causes of RCCB tripping?
Typical causes include insulation degradation, moisture ingress, damaged cables, faulty appliances, or neutral-earth leakage. Investigation of the downstream circuit is required before re-energizing.

5) Can NL1-63 RCCB be used in retrofit projects?
Yes. It is widely used in retrofit and safety-upgrade projects due to DIN-rail mounting and compatibility with standard MCBs in existing distribution boards.