Motor starters

Star-delta starter   This is the most popular and commonly used starting method for motor ratings > 4 kW (400 V).   • Electronic motor starter (EMS) and soft starter These enable the soft and low-noise starting of the motor. This eliminates interference producing current peaks and jerks during switching. The startup and deceleration phase...

Direct on line starter

Direct-on-line starter   In the simplest case the motor is connected directly with a contactor. The combination of motor protection and cable protection (fuse) is called a motor starter (MSC = Motor Starter Combination). By applying the full mains voltage to the motor windings, DOL starting may produce large starting currents which may result in troublesome...

CB Number of poles

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Standards

CE The CE conformity marking shall indicate conformity to all the obligations imposed on the manufacturer, as regards his products, by virtue of the European Community directives providing for the affixing of the CE marking.   When the CE marking is affixed on a product, it represents a declaration of the manufacturer or of his authorized representative that the product...

Standards

“Low Voltage” Directive 2006/95/CE The Low Voltage Directive refers to any electrical equipment designed for use at a rated voltage from 50 to 1000 V for alternating current and from 75 to 1500 V for direct current. In particular, it is applicable to any apparatus used for production, conversion, transmission, distribution and use of electrical power, such as machines, transformers,...

Control Circuits

Control Circuits Control  Control components are used in a wide variety of applications with varying degrees of complexity. One example of a simple control circuit is a circuit that turns a light on and off. In this circuit, the control component is often a single-pole switch.  ...

Electrical Panel

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Pollution Degree

The level of pollution in the environment in which the Assembly is intended to be installed. Four categories are defined in the Standard as follows:   Pollution degree 1 : No pollution or only dry, non-conductive pollution occurs. Pollution degree 2 : Normally, only non-conductive pollution occurs. Occasionally, however, a temporary                             ...

ROUTINE TESTS

These tests have a totally different function to Type Tests, BS EN 60439-1, states:   ‘Routine tests are intended to detect faults in materials and workmanship. They are carried out on every ASSEMBLY after its assembly or on each transport unit. Another routine test at the place of installation is not required.’   Hence, Routine Tests on Assemblies are normally undertaken...

PARTIALLY TYPE TESTED ASSEMBLY (PTTA)

IEC 60439-1, defines a PTTA as: ‘A low-voltage switchgear and controlgear assembly, containing both type-tested and nontype- tested arrangements provided the latter are derived (e.g. by calculation) from type tested arrangements which have complied with the relevant tests’.   This means: • The assembly will be derived from a Type Tested Assembly. • Deviations...

TYPE TESTED ASSEMBLY (TTA)

IEC 60439-1, defines a TTA as:   ‘A low-voltage switchgear and controlgear assembly conforming to an established type or system without deviations likely to significantly influence the performance, from the typical ASSEMBLY verified to be in accordance with this standard.’   This means: • The generic design of the Assembly including all the various elements...

Current ratings

Rated current (In)   value of current, declared by the ASSEMBLY manufacturer taking into consideration the ratings of the components, their disposition and application, which can be carried without the temperature-rise of various parts of the ASSEMBLY exceeding specified limits under specified conditions   Rated peak withstand current (Ipk) value of peak short-circuit...