Three-phase protection and measurement block provides the connection between the three-phase, air or underground connection and the subscriber’s main power supply column. It connects customers to the low voltage network of the active and reactive electrical energy supplier consumed and ensures the protection of the installation.
Technical Specifications
| Standards |
IEC 60439-1 ; Electrica SA specifications no. 4/2003 |
| Miminal insulation voltage Ui |
630 V |
| Use nominal voltage Ue |
400 V |
| Overvoltage category |
IV |
| Polution class |
3 |
| Nominal frequency |
50 HZ |
| Nominal current Ie (A) |
16, 25, 32, 40, 63, 80, 100, 125, 160, 200, 250 |
| Protection for |
Overload, short circuit, over-voltage and differential |
| Protection degree |
IP54 |
| Surface treatment |
Powder coating finishing |
| Usage | |
| Climatic class |
N3, T3, N1, T1 |
| Ambient temperature |
-25OC…+40OC |
| relative humidity at 20OC |
90% |
| Installation |
Interior, exterior |
Functions:
- measurement of electricity consumption (active – reactive);
- connecting consumers’ facilities to the supplier’s power facilities;
- protection against industrial frequency over-voltages produced by the consumer by accidental interruption of the neutral conductor;
- protection against electric shock by directly touching the circuits and equipment in the protective block box normally energized;
- re-actuating possibility by the consumer in the case of protection activation or of a defect in its installation, by providing a window of access to the circuit breaker while preserving the degree of protection, with the possibility of securing the access by the supplier;
- the possibility of reading the meters or, where appropriate, the interruption of the electricity supply by the supplier, regardless of the consumer’s presence;
- protection against electric shock and damage to equipment by malicious or unauthorized persons;
- short-circuit and overload protection of the general power supply to the consumer.
