| US 7,463,470 B2 | ||
| Electrical barrier | ||
| Peter Kingston Lark, Manchester (United Kingdom) | ||
| Assigned to Pepperl & Fuchs GB Ltd, Oldham (United Kingdom) | ||
| Filed on Jan. 23, 2006, as Appl. No. 11/275,661. | ||
| Claims priority of application No. 0501415.4 (GB), filed on Jan. 24, 2005. | ||
| Prior Publication US 2006/0164780 A1, Jul. 27, 2006 | ||
| Int. Cl. H02H 3/22 (2006.01); H01C 7/12 (2006.01); H02H 1/00 (2006.01); H02H 1/04 (2006.01); H02H 9/06 (2006.01) | ||
| U.S. Cl. 361—111 [361/18; 361/91.2; 361/91.6] | 4 Claims |
| 1. An electrical barrier consisting of:
an input adaptor to be connected to a power supply and an output adaptor to be connected to electrical equipment for use in
a hazardous area;
a single shunt zener diode polarized in the reverse for limiting the output voltage;
an output series resistance for limiting the output current wherein a sensing resistance is connected in series with the a
single shunt zener diode; and
a voltage regulator configured and arranged to regulate an input voltage in response to current flowing through the sensing
resistance.
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