Safety switch apparatus

Details Safety switch apparatus Safety switch apparatus

1987-06-05

1988-11-01

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

307140, 3071414, H01H 334

Patent

active

047824204

ABSTRACT:
An automatic safety switch apparatus is provided for interrupting power to an electrical appliance such as a cooking stove after a predetermined period of operation. The apparatus includes a current detector for sensing a threshold current level between a power source and the appliance, a timer responsive to the detector, and a relay driven by the timer for opening a circuit between the source and the appliance. The timer, which can be programmed to provide a maximum interval of time during which the appliance can be safely operated unattended, is automatically reset when the appliance is turned off.

REFERENCES:
patent: 4031463 (1977-06-01), Norberg
patent: 4588901 (1986-05-01), Maclay
Booklet describing features, functions and configurations of a SAB 0529 Programmable Digital Timer, Siemens Aktiengesellschaft, 18 pages, from 1987-1988 Product Catalog (timer originally introduced in 1983-1984 Product Catalog).

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