CHINT NXB-63 C40 40A 2-Pole 6kA AC Miniature Circuit Breaker

Product Identification

This is a thermal-magnetic MCB for overload and short-circuit protection. It is not an RCCB or RCBO and does not provide residual-current/earth-leakage protection.

Short Description

The CHINT NXB-63 C40 is a 40A, 2-pole, C-curve AC miniature circuit breaker with 6kA breaking capacity. Designed for IEC final-distribution systems, it provides overload, short-circuit and positive-isolation functions with 35 mm DIN-rail mounting.

Long Description

The CHINT NXB-63 C40 2P MCB provides dependable thermal-magnetic protection for low-voltage AC final-distribution circuits. Its mechanically linked two-pole design disconnects both poles together, while the C tripping characteristic is intended for mixed and moderately inductive loads where normal inrush current is higher than purely resistive circuits.

CHINT officially lists this exact 2P C40 variant for AC 380/400/415V operation with 6kA breaking capacity and IEC/EN 60898-1 compliance. The compact two-module device mounts on a TH35-7.5 DIN rail, supports top or bottom cable entry and includes front status windows for clear ON/OFF indication. Installation and circuit selection must be completed by a qualified electrician according to the actual load, prospective fault current and local regulations.

Key Features

• 40A rated current

• Two-pole mechanically linked switching

• C-curve thermal-magnetic tripping characteristic

• 6kA rated short-circuit breaking capacity

• Overload protection

• Short-circuit protection

• Positive isolation function

• AC 380/400/415V exact-variant rating

• IEC/EN 60898-1 compliance

• Green/red ON/OFF contact-position indication

• TH35-7.5 DIN-rail mounting

• 20,000 mechanical and 10,000 electrical operating cycles

Technical Specifications

Applications

• Residential final-distribution boards

• Commercial electrical panels

• Light-industrial distribution circuits

• Lighting and socket circuits within the verified rating

• Mixed and moderately inductive AC loads

• Branch-circuit overload and short-circuit protection

• Two-pole AC circuit isolation

• Solar and hybrid installations on the protected AC distribution side

Application restriction: CHINT's manual states that the product is not suitable for direct starting of high-inductive or high-capacity loads such as large fans, motors, electric-heating equipment and capacitor cabinets.

Box Contents

• 1 × CHINT NXB-63 C40 40A 2P MCB

• Printed manual or certificate: Not Verified

• DIN rail: Not Included / Not Verified

• Cables, lugs and enclosure: Not Included / Not Verified

Protection Features

• Thermal overload protection

• Magnetic short-circuit protection

• 6kA fault-current breaking capacity

• Positive isolation

• Mechanically linked two-pole operation

• ON/OFF contact-position indication

• IP20 direct-mounted enclosure protection

Not provided: residual-current/earth-leakage protection, surge protection, arc-fault protection, automatic transfer or over/under-voltage protection unless separate compatible accessories/devices are installed.

Certifications

Warranty

Official warranty duration for this exact NXB-63 variant: Not Verified. Confirm the applicable Pakistan distributor or seller warranty before publishing a fixed warranty period.