Learn to understand the symbols on the circuit breaker. Knowledge that will be useful to many people in everyday life

  • Apr 26, 2021
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It is no secret to anyone that circuit breakers are now widely used in all possible electrical installations of buildings. In fact, no "electrician" can do without them.

Often, an ordinary person who is not good at wiring does not understand what these or those designations mean on household circuit breakers. This article is just for such people.

So, the circuit breaker, according to regulatory documents, must have a durable marking, which includes:

  • «Manufacturer's name or trademark.
  • Type designation, catalog or serial number.
  • One or more values ​​of the rated voltage.
  • Nominal current In in amperes without indication of the unit of measure, preceded by the designation of the type of instantaneous release (B, C or D; for universal circuit breakers, indicate B or C). For example, the “C 32” marking on the circuit breaker indicates that it is of type C instantaneous release and a rated current of 32 A.
  • Rated frequency if the circuit breaker is designed for only one frequency - 50 or 60 Hz.
  • Rated short-circuit breaking capacity Icn in amperes.
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  • Switching diagram, if the correct way of connecting the conductors of external electrical circuits to the circuit breaker is not obvious.
  • The reference temperature of the ambient air, if it differs from 30 ° C.
  • Degree of protection if different from IP20.

The marking indicating the type of instantaneous release and the rated current must be clearly visible after the installation of the circuit breaker.

In the absence of space, marking of the remaining characteristics can be made on the side and rear surfaces of the circuit breaker.

On circuit breakers that have several values ​​of the rated current, their maximum value is marked, as well as the value of the rated current to which it is adjusted.

And now examples

Fig. 1. Designations on a single-pole "machine" of the S 200 series (photo taken from the book by Yu.V. Kharechko Modular protective devices. - M.: LLC "ABB Industry and Stroytekhnika", 2008. - 336 p.)

Figure 1 indicates:

  • 1 - manufacturer's trademark;
  • 2 - serial number;
  • 3 - type of instantaneous release C, rated current 16 A;
  • 4 - rated operating voltage 230/400 V;
  • 5 - rated short-circuit switching capacity 6,000 A;
  • 6 - class of electricity limitation 3;
  • 7 - control body (disabled position).

And consider one more example:

Fig. 2. Marking of a two-pole automatic circuit breaker of the S 290 series (photo taken from the book by Yu.V. Kharechko Modular protection devices. - M.: LLC "ABB Industry and Stroytekhnika", 2008. - 336 p.)
  • 1 - manufacturer's trademark;
  • 2 - serial number;
  • 3 - type of instantaneous release C, rated current 125 A;
  • 4 - rated operating voltage 400 V;
  • 5 - rated switching capacity at short circuit 10,000 A;
  • 6 - position indicator;
  • 7 - control body (disabled position).

As you can see, learning to "read" circuit breakers is not at all difficult. But this is really useful knowledge that can always be useful to every homeowner - even in order to understand for himself with what technical characteristics the electrician installed in the electrical panel when he installed the electrical installation of the building.

I also prepared a video for you on this topic (I will be glad to see your likes and comments):