MB30-CS datasheet(7/105 Pages) MITSUBISHI

7 / 105 page

3.1 General

The primary components are: a switching mechanism,

an automatic tripping device (and manual trip button),

contacts, an arc-extinguishing device, terminals and

a molded case.

3. CONSTRUCTION AND OPERATION

Fig. 3.1 Type NF100-SP Construction

Handle

1. Trip indication

The automatically tripped condi-

tion is indicated by the handle in

the center position between ON

and OFF, the yellow (or white)

line cannot be seen in this posi-

tion.

2. Resetting

Resetting after tripping is per-

formed by first moving the han-

dle to the OFF position to en-

gage the mechanism, then re-

turning the handle to ON to re-

close the circuit.

3. Trip-Free

Even if the handle is held at

ON, the breaker will trip if an

overcurrent flows.

4. Contact On Mechanism

Even in the worst case in which

welding occurs owing to an

overcurrent, the breaker will trip

and the handle will maintain to

ON, indicating the energizing

state.

OFF

Trip

Handle indication

Arc-Extinguishing Device

Mitsubishi MCCBs feature excel-

lent

arc-extinguishing

perfor-

mance by virtue of the optimum

combination of grid gap, shape,

and material.

Trip Button (Push to Trip)

Enables

tripping

mechanically

from outside, for confirming the

operation of the accessory switch-

es and the manual resetting func-

tion.

Switching Mechanism

The contacts open and close rap-

idly, regardless of the moving

speed of the handle, minimizing

contact wear and ensuring safety.

Link-mechanism

operation

Magnetic flux

Arc extinction

Magnetic

force

Grid

Arc

Contact

Molded case

(Base)

Terminal

Molded case

(Cover)

Automatic tripping device

OFF

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