Istič HiSmart NV821549 3P 25A trieda C 6kA

HiSmart NV821549 is a three-pole miniature circuit breaker with a rated current of 25 A, C tripping characteristic and 6 kA rated breaking capacity. It is designed to protect three-phase circuits from overloads and short circuits in residential and light commercial installations. The device features a compact housing for DIN-rail (35 mm) mounting and provides clear contact position indication for fast visual checks.

Advantages

The circuit breaker offers overload and short-circuit protection with a C-type tripping curve suitable for general-purpose circuits. It has a flame-retardant, high-temperature- and impact-resistant enclosure and an anti-mistake contact terminal block. Contact position is indicated by color (red = closed, green = open). The product meets IEC/EN 60898-1 standards and includes both top and bottom connections compatible with cable or pin-type busbar.

Suitable for

• Protection of three-phase distribution circuits in homes
• Light commercial electrical panels and small workshops
• DIN-rail installations requiring selective protection and clear contact indication

Key specifications

• Number of poles: 3
• Rated current (In): 25 A
• Tripping class: C
• 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: 20,000 operations
• Electrical life: 8,000 operations
• Protection degree: IP20
• Terminal connection: cable / pin-type busbar
• Wire / busbar cross-section: up to 25 mm² / 18-3 AWG
• Connection: top and bottom
• Mounting: 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 54 mm
• Standards: IEC 60898-1 / EN 60898-1
• Warranty: 24 months

How to use

Install the HiSmart NV821549 on a 35 mm DIN rail using the fast clip device, ensuring both top and bottom terminals are accessible for cable or pin-type busbar connections. Connect conductors within the specified cross-sectional area and tighten terminals to the manufacturer’s recommended torque. Use the breaker as the protective device for three-phase circuits; verify correct wiring and perform a functional test by switching the breaker on and off and checking the contact position indicator (red = closed, green = open).

Recommendations

Do not exceed the rated current of 25 A and ensure the installation environment stays within the specified temperature limits. For safe operation, use the breaker in accordance with IEC/EN 60898-1 and have connections tightened by a qualified electrician. Regularly inspect the device for signs of damage and verify contact indication during maintenance.