Circuit breaker HiSmart NV821600 4-pole 20A miniature DIN-rail

Miniature circuit breaker HiSmart NV821600 is a 4-pole, 20 A device for DIN-rail installation that provides overcurrent and short-circuit protection for multi-phase circuits. The compact design and top-and-bottom connections allow straightforward mounting and wiring in residential, commercial and light-industrial electrical panels. The breaker includes a contact position indicator for clear on/off status and is made from flame-retardant, impact- and high-temperature-resistant materials.

Advantages

The HiSmart NV821600 offers coordinated overload and short-circuit protection with a C characteristic curve, a rated breaking capacity of 6 kA and IP20 protection class. It features an anti-mistake contact terminal block, clear red/green contact position indication, and supports cable or pin-type busbar connections up to 25 mm². Designed for DIN-rail EN 60715 (35 mm) mounting, it combines compact dimensions with long mechanical and electrical life.

Suitable for

• Protecting multi-phase circuits in residential distribution boards
• Overcurrent and short-circuit protection in small commercial installations
• Light-industrial panels where space-saving DIN-rail mounting is required

Key specifications

• Number of poles: 4
• Rated current (In): 20 A
• Trip curve: Class C
• Rated 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 class: IP20
• Terminal connection type: 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 71.5 mm
• Standards: IEC 60898-1 / EN 60898-1
• Warranty: 24 months

How to use

Install the HiSmart NV821600 on a 35 mm DIN rail (EN 60715) using the fast clip device. Make electrical connections from top and bottom, using the terminal block for cable or pin-type busbar up to the specified cross-sectional area. Ensure correct wiring for the four poles and verify that the supply voltage and frequency match the rated values. After mounting and wiring, test the contact position indicator to confirm correct closed (red) and open (green) states before placing the circuit into service.

Recommendations

Use this 4-pole 20 A C-characteristic breaker for multi-phase circuits where a 6 kA breaking capacity and compact DIN-rail mounting are required. Confirm cable cross-sections and tightening torques per local electrical codes and perform routine inspections; avoid exposure beyond the specified operating temperature range.