Residual Current Breaker HiSmart NV821891 2P 25A 30mA

Residual current circuit breaker HiSmart NV821891 is a 2-pole RCBO rated for 25 A nominal current and 30 mA residual sensitivity. It combines overcurrent and earth-leakage protection in a compact device suitable for residential and light commercial distribution boards. The unit disconnects supply quickly in case of fault currents to reduce risk of electric shock and fire.

Advantages

The HiSmart NV821891 integrates short-circuit/overload protection with residual-current detection, providing combined protection in a single module. It features an anti-mistake contact terminal block, clear contact position indication (red = closed, green = open), and a flame-retardant, high-temperature resistant housing with impact resistance. The device offers a rated short-circuit capacity of 6 kA and complies with IEC 61009-1 / EN 61009-1 standards.

Suitable for

• Residential distribution boards
• Light commercial electrical installations
• Protection of circuits with earth-leakage concerns (bathrooms, kitchens)
• Circuit protection where combined overcurrent and residual-current protection is required

Key specifications

• Type: Residual current circuit breaker with overcurrent protection (RCBO), 2 poles
• Rated current: 25 A
• Tripping characteristic: Class C
• Residual sensitivity: 30 mA
• Rated voltage: AC 230 V, 50/60 Hz
• Rated short-circuit capacity (Icn): 6000 A
• Rated impulse withstand voltage (Uimp): 4000 V
• Insulation voltage (Ui): 500 V
• Break time: ≤ 0.1 s
• Mechanical life: 10,000 cycles; Electrical life: 4,000 cycles
• Connection type: cable / pin-type busbar; top connection; wire/busbar up to 35 mm²
• Installation: DIN rail EN 60715 (35 mm)
• Protection degree: IP20
• Operating temperature: -25 °C to +70 °C
• Dimensions: 82 × 36 × 78 mm
• Standards: IEC 61009-1 / EN 61009-1

How to use

Mount the RCBO on a standard 35 mm DIN rail and make electrical connections to the top terminals following the wiring diagram and local regulations. Connect phase and neutral conductors to the appropriate input and output terminals and ensure tight, secure terminations for cables or pin-type busbars up to 35 mm². After installation, test the device using the built-in test button to verify residual-current operation before placing the circuit into regular service.

Recommendations

Use the HiSmart NV821891 for circuits where both overcurrent and earth-leakage protection are required. Periodically test the device (at least once every three months) using the test button, and inspect connections for tightness after initial commissioning and during routine maintenance. Replace the unit if it shows signs of mechanical damage or fails functional tests.