(JP9158717-A)      The apparatus controls power supplied to an electrically heated catalyst attached to an exhaust gas passage (2) of an internal combustion engine (1) from a power source (8) through a power supply circuit which includes a control relay (11) that is opened and closed by a control circuit (10). The control appts. comprises a fault detector (20) for detecting the occurrence of such a fault that the power supply to the catalyst cannot be interrupted by the control relay. A forcible circuit shut-off unit is provided in the path of the power supply circuit from the power supply source to the catalyst and forcibly shuts off the power supply circuit when it is actuated.    The forcible shut-off circuit effects shut-off operation when a fault is detected by the fault detector. The forcible shut-off unit may be the control relay, or a relay provided between the control relay and a fuse (7) provided in the power supply circuit from the power source to the catalyst. Alternatively, the forcible shut-off unit may be a heater or a burner which melt-cuts the fuse.    ADVANTAGE -   Reliability is enhanced, even when fault has occurred in power supply circuit. Shut-off portion may be replaceably attached, allowing power supply circuit to be easily restored.    (US5746053-A)      The apparatus controls power supplied to an electrically heated catalyst attached to an exhaust gas passage (2) of an internal combustion engine (1) from a power source (8) through a power supply circuit which includes a control relay (11) that is opened and closed by a control circuit (10). The control appts. comprises a fault detector (20) for detecting the occurrence of such a fault that the power supply to the catalyst cannot be interrupted by the control relay. A forcible circuit shut-off unit is provided in the path of the power supply circuit from the power supply source to the catalyst and forcibly shuts off the power supply circuit when it is actuated.    The forcible shut-off circuit effects shut-off operation when a fault is detected by the fault detector. The forcible shut-off unit may be the control relay, or a relay provided between the control relay and a fuse (7) provided in the power supply circuit from the power source to the catalyst. Alternatively, the forcible shut-off unit may be a heater or a burner which melt-cuts the fuse.    ADVANTAGE -   Reliability is enhanced, even when fault has occurred in power supply circuit. Shut-off portion may be replaceably attached, allowing power supply circuit to be easily restored.    (EP778400-B1)      The apparatus controls power supplied to an electrically heated catalyst attached to an exhaust gas passage (2) of an internal combustion engine (1) from a power source (8) through a power supply circuit which includes a control relay (11) that is opened and closed by a control circuit (10). The control appts. comprises a fault detector (20) for detecting the occurrence of such a fault that the power supply to the catalyst cannot be interrupted by the control relay. A forcible circuit shut-off unit is provided in the path of the power supply circuit from the power supply source to the catalyst and forcibly shuts off the power supply circuit when it is actuated.    The forcible shut-off circuit effects shut-off operation when a fault is detected by the fault detector. The forcible shut-off unit may be the control relay, or a relay provided between the control relay and a fuse (7) provided in the power supply circuit from the power source to the catalyst. Alternatively, the forcible shut-off unit may be a heater or a burner which melt-cuts the fuse.    ADVANTAGE -   Reliability is enhanced, even when fault has occurred in power supply circuit. Shut-off portion may be replaceably attached, allowing power supply circuit to be easily restored.