SCHNEIDER Superimmunized type A - SI 4-pole differential switch, 25 amps, 30 milliamps (4Px25Ax30mA) with 4 modules.
Suitable for the domestic, tertiary and industrial sectors.
Type A differentials, also developed in IEC 61008-1 and its Spanish adaptation UNE-EN 61008-1, also protect the faults detected by AC type devices and their use is recommended in those specific electrical circuits where electrical equipment is to be connected. that can cause these types of defects.
The superimmunized differentials incorporate high-frequency filters that prevent nuisance tripping in the presence of non-linear loads (electronics), as well as an energy storage circuit against nuisance tripping caused by transient impulses.
Specs:
- Product type: RCCB SCHNEIDER Superimmunized type A - SI
- Number of poles: 4P
- Rated current [In]: 25A
- Network type: AC
- Ground Leakage Sensitivity: 30mA
- Earth Leakage Protection Delay: Instantaneous
- Earth Leakage Protection Class: Type A-SI
- Making and breaking capacity: Im 500 A conforming to EN/IEC 61008
- Conditional short-circuit current: Inc 6 kA
- Mains frequency: 50/60 Hz
- Rated operational voltage [Ue]: 220...240 V AC 50/60 Hz
- Residual current tripping technology: Voltage independent
- Connection and breaking capacity: Idm 1500 A, Lm 1500 A
- Conditional short-circuit current: 10 kA
- Rated insulation voltage [Ui]: 500 V AC 50/60 Hz
- Withstand voltage peaks [Uimp]: 6 kV
- Surge Current: 3000A
- Control Type: Lever
- Local signals: On/off indication
- Mount Type: Adjustable Clip
- Mounting bracket: DIN rail
- 9mm pitches: 4
- Dimensions: Height 91mm - Width 72mm - Depth 73.5mm
- Mechanical durability: 20,000 cycles
- Electrical durability: AC-1, state 1 15000 cycles
The Acti 9 range corresponds to the fifth generation of low voltage modular systems from Schneider Electric, setting a new precedent in the field of low voltage terminal distribution.
Acti 9 includes many innovations and is based on more than 40 years of Schneider Electric experience. A range of protections covering all applications, especially disturbed networks and polluted environments, with total security and continuous service improvement.
Acti 9 is easy to select and install, and is environmentally friendly. Its components are 100% recyclable and recoverable.
Reference. SCHNEIDER A9R61425
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.
