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A class Si type Residual current devices
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Residual current circuit-breakers for specific applications which ensure:
- The control and isolation of electrical circuits
- The protection of persons against direct and indirect contacts
- The protection of installations against insulation faults.
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They conform to both the residual current device standard BS EN 61008 and to switch standards BS EN 60947-1 and BS EN 60947-3.
These Residual current circuit-breakers are used in the commercial and industrial sectors where many power supplies may be present and there is a risk of tripping due to:
- Successive lightning strokes
- IT earthing system
- Variable speed controllers, frequency converters
- Presence of electronic ballasts
- Presence of switchgear that incorporates interference filters i.e. lighting, microcomputing, etc.
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| Technical data |
- Voltage rating 230…400 V AC, -15…+10 %
- Frequency rating: 50/60 Hz
- Current rating (Ith) at 40 °C 16…80 A
- As in BSEN 61008 Breaking and making capacity Rated residual (I∆m): 2.5 kA Rated (Im): 1.5 kA
- As in BSEN 60947-3: Isolation with positive break indication, opening is indicated by a green strip on the device operating handle. This indicator shows that all poles are open.
- Rated impulse withstand Voltage (Uimp): 6 kV
- Insulation voltage (Ui): 440 V
- Utilisation category: AC 23A rating up to 63 A, AC 22B ratings 80
- Padlocking in the "tripped" position is possible using the padlocking device (not supplied)
- Protected against nuisance tripping due to transient overvoltages (lightning, switchgear operation on the network, etc.) Impulse withstand level 8/20 µs: 3 kA for instantaneous, 3 kA for selective.
- Short-circuit current withstand (I∆c = Inc): 10 kA with 100 A fuse upstream
- Number of operations (O-C): 20 000
- Units with fixed sensitivities for all ratings
- Instantaneous trip or Selective trip = total vertical selectivity can be achieved using 30 mA residual current devices placed downstream
- Mechanical Indication: earth fault indication on front panel by means of a mechanical indicator
- Electrical Indication: using auxiliaries
- Remote tripping: using auxiliaries ( shunt or undervoltage release)
- Environment: Tropicalisation: treatment 2 (relative humidity 95 % at 55°C)
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