Mini circuit breaker electro base DS3-20A-B — 3‑phase, 20 A, B-curve

Mini circuit breaker electro base DS3-20A-B is a three‑pole protective device rated at 20 A with a B tripping curve, intended for use in three‑phase electrical circuits. It provides overcurrent and short‑circuit protection in compact DIN‑rail distribution installations and includes a manual toggle for on/off switching. The breaker is designed for installation in residential, commercial and light industrial distribution boards where space efficiency and reliable protection are required.

Advantages

The DS3-20A-B offers precise thermal-magnetic tripping with a B curve suitable for circuits with predominantly resistive loads. Its three‑pole design ensures simultaneous disconnection of all phases, improving safety during faults. Compact dimensions and standard DIN‑rail mounting simplify integration into existing panels. The manual toggle gives straightforward operation for switching and testing, while robust construction supports continuous operation under normal load conditions.

Подходит для

• Защита трёхфазных линий питания в жилых распределительных щитах
• Коммерческие распределительные щиты с равномерной нагрузкой
• Лёгкая промышленность и офисные электроустановки
• Модернизация и расширение существующих распределительных панелей

Key specifications

• Poles: 3 (three‑pole)
• Rated current: 20 A
• Tripping characteristic: B curve (thermal‑magnetic)
• Function: overcurrent and short‑circuit protection
• Mounting: standard DIN‑rail (35 mm)
• Operation: manual toggle ON/OFF
• Applicable system: three‑phase AC circuits
• Typical ambient use: indoor distribution boards

How to use

Install the DS3-20A-B on a standard 35 mm DIN rail inside the distribution board in compliance with local electrical codes. Connect the incoming three‑phase supply to the breaker line terminals and the load to the corresponding load terminals, ensuring correct phase order and secure torque on terminal screws. Use the manual toggle to switch the circuit on after installation checks and to reset the breaker following a trip. Verify that protective coordination with upstream and downstream devices is correct and test the circuit under no‑load conditions before full commissioning.

Usage recommendations

Use this breaker in circuits with primarily resistive or light inductive loads where a B tripping curve is appropriate. Avoid application on heavy motor loads or highly inductive circuits without verifying inrush current levels and coordination with motor protection devices. Regularly inspect connections for tightness and signs of overheating, and ensure the breaker is used within its rated current and environmental limits.

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