LEGRAND type A - Hpi 4-pole, 25-amp, 30-milliampere (4Px25Ax30mA) superminiature differential switch with 4 modules.
Suitable for the domestic, tertiary and industrial sectors.
Type A: they detect the defects of alternating and continuous components (specialized circuits: kitchens, hobs, washing machines, etc.).
Type Hpi: they detect faults in AC and DC components (type A) with enhanced immunity to nuisance tripping (environments with disturbances: computer circuits, lightning strikes, fluorescent lamps, etc.).
The superimmunized differentials incorporate filters of high fractures that avoid untimely firings in the presence of nonlinear loads (electronics), as well as a circuit of accumulation of energy against the untimely shots caused by transient impulses.
Specifications:
- BBuilt according to UNE-EN 61008-1:96
- Short circuit resistance of 10 kA
- Screws
- Built-in label holder
- Rated operating voltage in alternating 230/400 V
- Cable cross-section at 25 mm²
The new LEGRAND Differential and Magnetothermal range has been designed to meet the safety and compliance efficiency needs of new electrical installations.
This new range of LEGRAND stands out for its ease of installation, cabling convenience and optimized maintenance operations, saving time at each stage of the work or installation and ensuring the best protection and maximum availability of the installation, as well as offering a great Speed of assembly.
Reference. LEGRAND 411694
How do superimmunized differentials work?
For a differential to jump, the difference between the phase output current and the neutral input current must exceed 30 or 300 milliamps (depending on the differential), which automatically causes the entire electrical circuit to be disconnected. The superimmunized differential manages to avoid these false shots, so that it only jumps when there is a real threat.
As it does? Thanks to the high-frequency filters that it incorporates, the superimmunized differential can distinguish earth faults from a false alarm caused, for example, by lighting with fluorescent tubes. These filters are, in fact, capacitors connected to ground through which permanent leakage currents circulate at 50 hertz, between 0.3 and 1.5 milliamps per device (may vary depending on the type of receiver).
If the sum of permanent leaks reaches 35 percent of the sensitivity of the differential, any small overvoltage -such as that caused by turning on several computers at the same time- can cause a nuisance trip.
For all these reasons, experts recommend installing a superimmunized differential in those installations in which the differential trips too frequently without just cause.
