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Glossary

There are various ways of connecting the device circuit breakers, such as insertion, plugging in or screwing in.

This number specifies how many electrically separated current paths can be connected to a device circuit breaker. There are device circuit breakers with different numbers of positions.

They display the tripping characteristics of a device circuit breaker. A diagram shows the switching time and amperage at which a circuit breaker trips.

Type of installation option of device circuit breakers, such as construction, installation or distributor type.

This is the current or voltage value of the device circuit breaker, as specified by the manufacturer for a particular operating condition. These values are related to the operating and performance features.

Rated current, voltage or frequency are values for which an item is dimensioned.

Describes how a device circuit breaker is operated or reset. Versions are available with automatic reset and manual actuation. These are equipped with an operating lever for regular or irregular switching operation.

Characteristic curves which describe the behavior of a device circuit breaker under specific current and voltage values.

Tripping of a device circuit breaker, without altering the position of the operating lever.

Circuit breakers, which protect from possible defects as a result of short circuit or overload. They are specially designed to protect devices and actuators in technical systems and machines.

This is the contact in the main circuit which conducts the current when closed.

This is the contact in the auxiliary circuit which is operated mechanically. It functions as a remote indication contact.

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

Short-circuit current arises between a faulty, low-resistance connection between two points that usually have different potentials.

These are used to protect cables from damage that could occur as a consequence of overload or short circuit.

This is the shortest distance between two conductive parts.

MTBF is short for Mean Time Between Failures and describes the expected value of the operating time between two consecutive failures.

This is a floating auxiliary contact. It is open if the main contact is closed.

The consequence of actuations from one position to another and back.

This is a floating auxiliary contact. It is closed if the main contact is also closed.

SFB stands for Selective Fuse Breaking. Device circuit breakers which work on the basis of this characteristic curve always trip in the event of a short circuit. The SFB tripping characteristic is between the M1 and F1 characteristic curve.

Power supply units which work on the basis of this technology provide a high current reserve in the event of a short circuit. Even for long cable paths, the safety equipment is supplied with the required breaking current. Unaffected system parts, which are also connected to this power supply, continue to be supplied with power.

Fuses open a circuit and shut off the current if a permitted current value is exceeded for a long period of time.

This is overcurrent that occurs in an undamaged electric circuit.

This is a current that exceeds the rated current.

This is the air temperature surrounding the equipment under specified conditions.

This is the maximum temporary voltage value which can be tolerated without causing any insulation damage under specified conditions.

This is a signal contact with three connections which provide N/C contact and N/O contact functions.

PHOENIX CONTACT (Pty) Ltd.

36 Lyn Road
P.O. Box 916
ZA-Ferndale 2160
+27/11/801-8200

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