Circuit breaker HiSmart NV821518 2-pole 25A C-curve miniature MCB

Miniature Circuit Breaker HiSmart NV821518 is a 2-pole MCB with a rated current of 25 A and a C tripping curve. It is intended for overcurrent and short-circuit protection in residential and light commercial distribution boards, providing reliable interruption of fault currents and selective protection for circuits with moderate inrush currents such as lighting and small motors. The device meets IEC 60898-1 / EN 60898-1 standards and is suitable for DIN-rail EN 60715 (35 mm) installation.

Advantages

The HiSmart NV821518 offers overload and short-circuit protection with clear contact position indication (red = closed, green = open). It features an anti-mistake contact terminal block, flame-retardant housing with high temperature and impact resistance, and both top and bottom connections for cables or pin-type busbars. With a rated breaking capacity of 6 kA, IP20 protection class, and a compact footprint for DIN-rail mounting, it supports wire cross-sections up to 25 mm² and has long mechanical and electrical life ratings.

Suitable for

• Protection of lighting circuits in homes and offices
• Protection of small motor circuits and household appliances
• Use in residential and light commercial distribution boards
• Retrofit and new installations on 35 mm DIN rails

Key specifications

• Number of poles: 2
• Rated current (In): 25 A
• Tripping characteristic: C-curve
• Rated operational voltage (Ue): AC 400 V
• Insulation voltage (Ui): 500 V
• Rated frequency: 50/60 Hz
• Rated breaking capacity (Icu): 6000 A
• Rated impulse withstand voltage (Uimp): 6000 V
• Mechanical life: 20000 operations
• Electrical life: 8000 operations
• Protection class: IP20
• Terminal connection: cable or pin-type busbar, top and bottom connection
• Wire/busbar cross-section: up to 25 mm² / 18-3 AWG
• Dimensions: 85.5 x 78.8 x 36 mm
• Standards: IEC 60898-1 / EN 60898-1
• Operating temperature: -5°C to +40°C (daily average <35°C)
• Storage temperature: -25°C to +70°C
• Warranty: 24 months

How to use

Install the HiSmart NV821518 on a 35 mm DIN rail using the fast clip device. Connect conductors or pin-type busbars to the top and bottom terminals, ensuring wire cross-sections do not exceed 25 mm² and that connections are tightened according to local wiring rules. Use the contact position indicator to verify ON (red) or OFF (green) status. The breaker is designed for use in AC distribution circuits up to 400 V and should be placed and rated according to the circuit load and selectivity requirements.

Recommendations

Check compatibility with local electrical codes and perform installation and maintenance only by qualified personnel. For circuits with high inrush currents or special protection requirements, verify selectivity and coordination with upstream/downstream protection devices.