EPP-R3054 datasheet(49/75 Pages) ABB

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PROTEC TA PLUS MCB DIS TR IBUTION B OA R D 2 5 0A

Rated operational voltage (U

The rated voltage of a circuit-breaker is the value

of voltage, assigned by the manufacturer, to

which its performance (particularly the short-

circuit performance) is referred.

The same circuit-breaker may be assigned a

number of rated voltages and associated rated

short-circuit capacities.

The voltage which appears across the terminals

of a pole of a circuit-breaker after the breaking

of the current.

The value of the power frequency recovery

voltage shall be equal to 110% of the rated

voltage of the circuit-breaker under test.

IEC/EN 60947-2

This part of the IEC/EN 60947 applies to circuit-

breakers, the main contacts of which are intended

to be connected to circuits, the rated voltage of

which does not exceed 1,000 V AC or 1,500 V DC

It applies whatever the rated currents, the

method of construction or the proposed

applications of the circuit-breakers may be.

The circuit-breakers are designed for use by

instructed people.

Rated ultimate short-circuit breaking capacity Icu

The rated ultimate short-circuit breaking capacity

of a circuit-breaker is the value of ultimate short-

circuit breaking capacity assigned to that circuit-

breaker by the manufacturer for the

corresponding rated operational voltage.

It is expressed as the value of the prospective

breaking current, in kA (r.m.s. value of the AC

component in the case of AC).

The sequence of operations shall be: O – t – CO

Rated service short-circuit breaking capacity Ics

The rated service short-circuit breaking capacity

of a circuitbreaker is the value of service short-

circuit breaking capacity assigned to that circuit-

breaker by the manufacturer for the

corresponding rated operational voltage. It is

expressed as a value of prospective breaking

current, in kA, corresponding to one of the

specified percentages of the rated ultimate

—

MCBs technical details

Definitions according to standards for

miniature circuit breakers

Rated insulation voltage (U

i) according

IEC/EN 60664-1:

Root mean square (R.M.S.) withstand voltage

value assigned by the manufacturer to the

equipment or to a part of it, characterizing the

specified (long-term) withstand capability of its

insulation.

—

The rated insulation voltage is not

necessarily equal to the rated

voltage of the equipment which is

primarily related to functional

performance.

IEC/EN 60898-1

Miniature Circuit Breakers according IEC/EN

60898-1 are intended for the protection against

over-currents of wiring installations in buildings

and similar applications; they are designed for

use by uninstructed people and for not

being maintained.

This part of IEC/EN 60898 applies for a.c. air-

break circuit-breakers for operation at 50 Hz or

60 Hz, having a rated voltage not exceeding 440 V

(between phases), a rated current not exceeding

125 A and a rated short-circuit capacity not

exceeding 25,000 A. As far as possible, it is in line

with the requirements contained in

IEC/EN 60947-2.

Rated short-circuit capacity (Icn)

The rated short-circuit capacity of a circuit-

breaker is the value of the ultimate short-circuit

breaking capacity assigned to that circuit-

breaker by the manufacturer.

The sequence of operations shall be: O – t – CO

Service short-circuit capacity (Ics)

A circuit-breaker having a given rated short-

circuit capacity has a corresponding fixed service

short-circuit capacity (Ics).

This is therefore generally not indicated.

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