Miniature Circuit Breaker HiSmart NV821440 1P 25A Type C

HiSmart NV821440 is a single-pole miniature circuit breaker with a 25 A rated current and Type C tripping characteristic. It is designed to protect electrical circuits from overloads and short circuits in residential and light-commercial installations. The device is DIN-rail mountable and provides compact, reliable protection for lighting, socket circuits and small motors.

Advantages

The HiSmart NV821440 offers overload and short-circuit protection with a rated breaking capacity of 6 kA. It features a clear contact position indicator (red = closed, green = open) and an anti-mistake contact terminal block. The body is flame-retardant with high temperature and impact resistance, and terminals accept cable or pin-type busbar connections up to 25 mm².

Suitable for

• Residential lighting circuits
• Socket outlets in homes and small offices
• Protection of small motors and appliances
• DIN-rail electrical distribution panels (35 mm)

Key specifications

• Number of poles: 1P
• Rated current: 25 A
• Tripping class: C
• Rated voltage: AC 230/400 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: 20,000 operations
• Electrical life: 8,000 operations
• Safety class: IP20
• Terminal connection: cable or pin-type busbar, up to 25 mm² (18-3 AWG)
• Connection: top and bottom
• Installation: DIN rail EN 60715 (35 mm) with fast clip
• Operating temperature: -5°C to +40°C (daily average <35°C)
• Storage temperature: -25°C to +70°C
• Dimensions: 85.5 x 78.8 x 18 mm
• Standards: IEC 60898-1 / EN 60898-1
• Manufacturer part number (MPN): NV821440
• EAN: 6942034315054

How to use

Mount the mini circuit breaker on a 35 mm DIN rail using the integral fast clip. Connect the incoming and outgoing conductors to the top and bottom terminals, respectively, using suitable cable or pin-type busbar connectors and ensure secure tightening according to local wiring regulations. Use the manual toggle to switch the circuit on (red indicator) and off (green indicator) and verify correct operation after installation.

Recommendations

Install and service the device only by qualified personnel. Verify that the breaker rating and Type C characteristic match the protected circuit and connected loads. Observe the specified operating temperature range and national electrical codes during installation and maintenance.