Residual Current Circuit Breaker HiSmart NV821921 4P 16A 30mA

Residual Current Circuit Breaker HiSmart NV821921 is a 4-pole RCBO rated at 16 A with 30 mA residual-current sensitivity. It provides combined protection against overloads, short circuits and earth-leakage faults for residential and light commercial electrical installations. The device meets IEC 61009-1 / EN 61009-1 standards and is intended for DIN-rail (35 mm) mounting with top-side connections.

Advantages

This HiSmart NV821921 RCBO integrates both residual-current detection and overcurrent protection in a single unit, simplifying wiring and saving panel space. It features a clear contact position indication (red = closed, green = open), an anti-mistake contact terminal block, and a flame-retardant, impact- and high-temperature-resistant housing. The device provides a rated short-circuit capacity of 6 kA and fast break time (≤0.1 s), ensuring reliable fault interruption.

Suitable for

• Residential distribution boards requiring 4-pole leakage protection
• Light commercial electrical panels with combined RCD and MCB needs
• Circuits where protection against electric shock and earth-fault fire risk reduction is required

Key specifications

• Number of poles: 4
• Rated current (In): 16 A
• Tripping characteristic: Class C
• Rated residual operating current: 30 mA
• Rated voltage (Ue): AC 230 V
• Rated short-circuit capacity (Icn): 6000 A
• Rated impulse withstand voltage (Uimp): 4000 V
• Insulation voltage (Ui): 500 V
• Frequency: 50/60 Hz
• Break time: ≤0.1 s
• Mechanical life: 10,000 cycles
• Electrical life: 4,000 cycles
• Protection degree: IP20
• Connection type: cable / pin-type busbar, top connection; conductor cross-section up to 35 mm²
• Mounting: DIN rail EN 60715 (35 mm)
• Operating temperature: -25 °C to +70 °C
• Dimensions: 82 x 72 x 78 mm
• Standards: IEC 61009-1 / EN 61009-1

How to use

Install the HiSmart NV821921 on a standard 35 mm DIN rail and make electrical connections to the top terminals according to the wiring diagram and local regulations. Ensure conductors are within the specified cross-sectional limits (up to 35 mm²) and tighten terminals to the recommended torque. Use the device in circuits up to its rated current (16 A) and rated voltage (AC 230 V). Test the residual-current function after installation using an appropriate test procedure.

Recommendations

Place the RCBO in easily accessible positions within the distribution board for periodic testing. Do not expose the device to corrosive environments or exceed the specified temperature range. Follow national wiring rules and the manufacturer’s installation instructions to ensure safe and reliable operation.