Guide to understand and correctly use electrical protection devices
WHAT IS A MAGNETOTHERMAL?
A circuit breaker is a protection switch designed to automatically open electrical circuits when overcurrents appear, whether overloads or short circuits. Its main function is to protect both the electrical installation and its receivers.
ANATOMY OF A MAGNETOTHERMAL
·NAME OF THE MANUFACTURER; identifies the manufacturer who designed, tested and guarantees the performance of the product.
·MODEL; It allows you to identify the specific technical characteristics of the model through the catalog.
·NOMINAL OPERATING VOLTAGE (Ue); Designed usage voltage
·CUTTING POWER; Maximum short circuit current that can safely interrupt
·SHOOTING CURVE (B,C,D); Graph that shows the trip time of the circuit breaker as a function of the intensity that passes through it. RATED CURRENT (In); maximum current that the circuit breaker can withstand continuously without tripping (at a reference temperature)
·VISUAL STATUS INDICATOR (ON OR OFF)
·OPERATIONAL SYMBOL; illustrates the mechanism of operation. This is a visual representation.
·COMPLIANCE REGULATIONS; Verifies that it meets international product standards for construction and performance testing. IEC 60898-1 (Residential Use) IEC 60947-2 (Industrial Use)
WHICH CURVE TO SELECT?
The choice of switch curve depends on the type of load and protection needs. For example, some types of loads generate high inrush currents, which could cause unwanted tripping if the correct cdurve is not selected…
·CURVE B
- Between 3 In to 5 In Suitable for protection of generators and long cable lengths
·CURVE C
- Between 5 In 10 In Suitable for the protection of residential installations, power outlets, lighting and general uses. They are the most used.
· CURVE D
- Between 10 In to 20 In Suitable for the protection of loads with high starting currents (motors or transformers)
he entire range of magnetothermal devices
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