Northern Connectors Harting HAN Industrial Rectangular Connectors - Manual (Page 28)

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Electrical engineering data
General
The choice of connectors entails more than just considering factors
such as functionality, the number of contacts, current and voltage
ratings. It is equally important to take account of where the con-
nectors are to be used and the prevailing ambient conditions. This
in turn means that, dependent on the conditions under which they
are to be installed and pursuant to the relevant standards, different
voltage and current ratings may apply for the same connectors.
The most important influencing factors and the corresponding
electrical characteristics of the associated connectors are illus-
trated here in greater detail.
Overvoltage category
The overvoltage category is dependent on the mains voltage and
the location at which the equipment is installed. It describes the
maximum overvoltage resistance of a device in the event of a pow-
er supply system fault, e. g. in the event of a lightening strike.
The overvoltage category affects the dimensioning of components
in that it determines the clearance air gap. Pursuant to the relevant
standards, there are 4 overvoltage categories.
Equipment for industrial use, such as fall HARTING heavy
duty Han connector, fall into Overvoltage Category III.
Extract from DIN VDE 0110-1 and IEC 60 664-1,
Para. 2.2.2.1.1
Rated impulse voltages (Table B2 of DIN EN 60 664-1)
Equipment of overvoltage category IV is for use at the origin of
the installation.
Note 1: Examples of such equipment are electricity meters and
primary overcurrent protection equipment.
Equipment of overvoltage category III is equipment in fixed in-
stallations and for cases where the reliability and the availability
of the equipment is subject to special requirements.
Note 2: Examples of such equipment are switches in the fixed
installation and equipment for industrial use with permanent con-
nection to the fixed installation.
Equipment of overvoltage category II is energy-consuming
equipment to be supplied from the fixed installation.
Note 3: Examples of such equipment are appliances, portable
tools and other household equipment with similar loads.
If such equipment is subjected to special requirements with
regard to reliability and availability, overvoltage category III ap-
plies.
Equipment of overvoltage category I is equipment for connec-
tion to circuits in which measures are taken to limit transient ov-
ervoltages to an appropriately low level.
Note: Examples are protected electronic circuits.
Voltage line-
to-neutral
derived from
nominal volta-
ges A.C. or
D.C. up to and
including
Nominal voltages presently used in the world
(= Rated insulation voltage of equipment)
Rated impulse voltage for equipment
Three-phase
4-wire systems
with earthed
neutral
Three-phase
3-wire systems
earthed or un-
earthed
Single-phase
2-wire systems
A.C. or D.C.
Single-phase
3-wire systems
A.C. or D.C.
Overvoltage category
I II III IV
Special
protected
levels
Level for
electrical
equipment
(household
and others)
Level for
distribution
supply
systems
Input level
V V V V V V V V V
50 12.5 24
25 30
42 48 30 ... 60 330 500 800 1500
100 66/115 66 60 500 800 1500 2500
150 120/208*
127/220
115, 120
127
100**
110, 220
100 ... 200**
110 ... 220
120 .. 240
800 1500 2500 4000
300 220/380, 230/400
240/415, 260/440
277/480
200**, 220
230, 240
260, 277
220 220 ... 440 1500 2500 4000 6000
600 347/600, 380/660
400/690, 417/720
480/830
347, 380, 400
415, 440, 480
500, 577, 600 480 480 ... 960 2500 4000 6000 8000
1000 660
690, 720
830, 1000
1000 4000 6000 8000 12 000
* ... Practice in the U.S.A and in Canada
** ... Practice in Japan