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US 9,312,081 B2Granted
Arcless fusible switch disconnect device for DC circuits
AssigneeCooper Technologies Company
InventorRobert Stephen Douglass
Life of this patent
Estimating the term…
Abstract
A fusible switch disconnect includes a fuse, a primary switch connected in series with the fuse. and a semiconductor switch device connected in parallel with the fuse. The semiconductor device is configured to resist current flow through the fuse and the primary fuse to facilitate arcless operation of the primary switch when connected to energized, DC circuitry.
Claims36
A fusible switch disconnect device comprising:
- first and second fuse terminals structured to removably accept an overcurrent protection fuse;
- a first primary switch connected in series with the first fuse terminal;
- and
- a semiconductor switch device connected in series with the second fuse terminal, wherein when the overcurrent protection fuse is accepted the semiconductor switch device is operable to resist current flow through the first primary switch, thereby facilitating arcless operation of the first primary switch when the fusible switch disconnect device is connected to energized, DC circuitry;
- and
- a second switch connected to the first primary switch and establishing a late break and early make connection to the first primary switch.
3 more elements
A fusible switch disconnect device comprising:
- a line side fuse terminal;
- a primary switch connected in series with the line side fuse terminal;
- a load side fuse terminal;
- and
- a semiconductor switch device connected in series with the load side fuse terminal, wherein the semiconductor switch device is operable to resist current flow from the line side fuse terminal to facilitate arcless operation of the primary switch when a fuse is connected to the line side fuse terminal and the load side fuse terminal and when the line side fuse terminal of the fusible switch disconnect device is connected to energized, DC circuitry;
- and
- a secondary switch establishing an electrical path in parallel with the line side fuse terminal and connected in series with the semiconductor switch device.
4 more elements
Dependencies are inferred from the claim text.