NB1 Miniature Circuit Breaker

DC MCB1（Mini circuit breaker)supplementary protectors are designed to provide over current protection within appliances or electrical equipment, where a branch circuit protection is already provided or not required. Devices are designed for direct current (DC) control circuit applications.It’s din rail mounted type and Current form 1A to 63A and voltage 110VDC ,125VDC to 250VDC 440V DC .

Features:

• B C trip curves models available for general

use and DC applications

• D trip curve models available for high starting

current applications such as motor starting

• Current ratings up to 63A

• Maximum 480VAC (multi-pole), 277VAC (single-pole)

• 5000 A Interrupt Rating

• DIN rail mount chassis

• Captive terminal screws won’t fall out

• Mechanical life: 20000 times.

• Electric life: 4000 times

• Captive terminal screws won’t fall out

Tripping curves

B curve

When the short-circuit currents are weak (generators, long cables).

Power circuit:

ratings: 1 to 63 A set at 30 °C

tripping curve: the magnetic trip units operate between 3 and 5 In.

C curve

Cables feeding conventional loads.

Power circuit:

ratings: 0.5 to 63 A set at 30 °C

tripping curve: the magnetic trip units operate between 5 and 10 In.

D curve

Loads with high inrush currents (motors, transformers).

Power circuit:

ratings: 0.5 to 63 A set at 40 °C

tripping curve: the magnetic trip units operate between 10 and 14 In.