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DOLD relays offered by Kühn Controls AG

DOLD

General technical definitions*

Open-circuit mode (normally de-energized mode)

Contact switches to operated condition when the operate condition is met.

Limiting continuous current Ith

This is the current that a relay contact may permanently carry without exceeding its permissible heating related to defined environmental conditions.

Accuracy (repeat accuracy)

This is the difference between the smallest and largest measured values of constant influence quantities related to the max. value (full scale value).

Equipment service life

Mechanical service life indicating the permissible number of operations for de-energized relay contacts.

Hysteresis

Hysteresis is generally known as maintaining an effect although the physical quantity that has caused it is no longer effective.
For relays, magnetic hysteresis causes the difference between pick-up and drop-out values.
In case of measuring relays the drop-out value is determined by an adjustable hysteresis.

Climate resistance / humidity class

Electromechanical equipment:
The standard DIN EN 60068-2-78 describes the tests for the environmental conditions of steady state damp heat, for example.

Electronic equipment:
The indication of climate resistance for electronic equipment is given as follows:
Climate resistance: 15(1) / 55(2) / 04(3) IEC/EN 60068-1
1) -15 °C
2) +55 °C
3) 4 days at 93 % rel. humidity of air 40 °C

Contact service life

Electrical service life indicating the number of operating cycles to be expected at a defined load, e.g. AC 15 (see the definition for switching capacity).

Creeping distance

This is the shortest distance along the surface of an insulating material between two conductive parts.

Clearance in air

This is the shortest distance in air between two conductive parts.

Nominal voltage

The nominal voltage of a relay is that voltage for which the winding including additional built-in components is designed and to which other characteristics are related to.
Devices that are rated for 230 V ± 10 % can only be operated on a 220 V or 240 V system with restricted tolerances.
For these devices, the restricted tolerance is indicated on the nameplate.

Protective separation

A protective separation of circuits is present when a single fault does not cause the voltage from being transferred to another circuit.
The definition of “protective separation” is based on the standards DIN EN 61140, DIN EN 60947-1 in conjunction with the standard DIN EN 60664-1 and is specified as rated impulse withstand voltage related to the pollution severity.
The rated impulse withstand voltage is the voltage level according to which clearance and creeping distances are rated.
It is determined as a function of the overvoltage category to which the electrical equipment is to be assigned to.

A specification of 4 kV/2 means: Rated impulse withstand voltage 4 kV related to the pollution severity 2.

Test voltage

The test voltage specifies the dielectric strength between coil and contact, e.g. 4 kV.

Closed-circuit mode (normally energized mode)

With the closed-circuit principle, the contact falls back in its normal position when the operate condition is met.

Degree of protection

Standardized classification of the protection of equipment against accidental contact, foreign bodies and water.
According to IEC/EN 60529, the degree of protection is indicated by the code letters IP and two code numbers.
The first code number describes the protection against accidental contact and foreign bodies, the second number the protection against water.

Degrees of protection against solid foreign bodies designated by the first code number
Degrees of protection against solid foreign bodies designated by the first code number

Degrees of protection against water designated by the second code number
Degrees of protection against water designated by the second code number

Switching capacity

Unaffected electric current a switching device or fuse can make/interrupt at a defined voltage under specified conditions.

Extract from IEC/EN 60 947-5-1

Table 1: Utilization categories for switching elements
Table 1: Utilization categories for switching elements

The rated operational current and the rated operational voltage are determined according to the values defined in the tables 2 and 3 for usual and unusual conditions depending on the utilization category.

Table 2: Proof of the making and breaking capacity of switching elements under usual conditions by utilization categories
Table 2: Proof of the making and breaking capacity of switching elements under usual conditions by utilization categories

Table 3: Proof of the making and breaking capacity of switching elements under unusual conditions by utilization categories1)
Table 3: Proof of the making and breaking capacity of switching elements under unusual conditions by utilization categories

Electrical life

The electrical life of a control unit is defined by the number of switching cycles under load that is reached or exceeded by 90 % of all devices under test without any repair or replacement of any part.

Extract from IEC/EN 60 947-5-1

Table 4: Making and breaking capacity for testing the electrical service life
Table 4: Making and breaking capacity for testing the electrical service life

*) extract from Dold main catalouge

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