Inventors:
Ronald Uhlenberg - Marshalltown IA, US
Stephen Seberger - Marshalltown IA, US
Riyaz Ali - Austin TX, US
Jimmie Snowbarger - Marshalltown IA, US
Clyde Eisenbeis - Marshalltown IA, US
Assignee:
FISHER CONTROLS INTERNATIONAL LLC - St. Louis MO
International Classification:
H02H 3/20
Abstract:
A device intended to meet flameproof approval requirements is configured to have two compartments separated by an energy-limiting barrier. The first compartment of the device houses the wiring terminations that bear ignition-capable energy and, therefore, must be flameproof. The energy-limiting barrier is configured to limit the energy that can reach the second compartment to a level that is not ignition capable. This allows the second compartment to be safe without meeting the flameproof requirements, and allows user-interface elements such as switches and indicators to be designed in a more cost-effective manner.