NF50-HRP datasheet(15/105 Pages) MITSUBISHI

Part #	NF50-HRP

Description	TECHNICAL NOTES

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Manufacturer	MITSUBISHI [Mitsubishi Electric Semiconductor]

Direct Link	http://www.mitsubishichips.com

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15 / 105 page

14

5. CIRCUIT BREAKER SELECTION

5.1 Circuit Breaker Selection Table

Following Table shows various characteristics of each breaker to consider selection and coordination with

upstream devices or loads.

Characteristics

Standard : Standard characteristics MCCBs

Low-inst

: Low-inst. MCCBs for Discrimination

When a power fuse (PF) is used as a high-voltage protector, it must be coordinated

with an MCCBs on the secondary side.

Generator : Generator-Protection MCCBs

These MCCBs have long-time-delay operation shorter than standard type and low

instantaneous operation.

Mag-Only : Magnetic trip only MCCBs

These are standard MCCBs minus the thermal tripping device. They have no time-

delay tripping characteristic, providing protection only against large-magnitude short-

circuit faults.

PF short-time tolerancs

capacity

Pf.

Tr.

MCCB1

MCCB2

MCCB

operating

characteristic

curve

Low-inst.MCCBs

Current

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