Bosch High-frequency production tools professional blue Page 50
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50 | High-frequency technology | Guide High-frequency technology A guide for the user Fig. 6 In the faulty status of the residual current protective switch, a residual current is discharged via the earth; in the current transformer not all currents cancel each other out, so that an induction occurs. Voltage is induced on the secondary side of the transformer. The relay coil of the residual current protective switch responds (Fig. 7). At 265 V/200 Hz three-phase current, there are residual current protective switches for 45 mA. Residual current protective switches for three-phase current of other voltages and frequencies must be requested separately from relevant manufacturers! The schematic illustration of a residual current protective switch is shown in Fig. 6. To satisfy the regulations and certain conditions in other countries, there are Bosch high-frequency tools for various operating voltages: 265 V, 135 V, 72 V, 42 V at 200 Hz; 200 V, 72 V, 42 V at 300 Hz. At low voltages, only few high-frequency tools should be used in the vicinity of the frequency converter because the currents occurring at greater power and low voltage require excessively large conductor cross-sections. Fig. 7
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