Transfer Switch For Sequentially Derived System
AssigneeReliance Controls Corporation
InventorsJEFFREY D. FLEGEL, BENJAMIN F. FLEGEL
Life of this patent
Estimating the term…
Abstract
A transfer switch configured to transfer connection of each power conductor and neutral conductor of a load between two power supplies. The transfer switch includes a switch member configured to transfer each of the connections in tandem. The transfer switch disconnects each power conductor prior to disconnecting the neutral conductor of the first supply when disconnecting the load from either power supply and connects the neutral connector prior to connecting each power conductor when connecting the load to either power supply.
Claims16
An electrical switching device for selectively connecting at least one hot lead and a neutral lead from either a first power source or a second power source to an electrical load, comprising:
- a first set of contacts configured to be electrically connected to the first power source;
- a second set of contacts configured to be electrically connected to the second power source;
- a third set of contacts configured to be electrically connected to the electrical load;
- a plurality of blades, each blade having a first end and a second end, wherein the first end of each blade is pivotally connected to a contact from the third set of contacts and the second end of each blade engages a contact from the first set of contacts in a first position and engages a contact from the second set of contacts in a second position;
- and
- an actuator operatively connected to the second end of each blade such that each of the blades is moved in tandem between the first position and the second position, wherein the blade selectively connecting the neutral lead disengages from either the first or second set of contacts after the blades selectively connecting the hot leads and the blade selectively connecting the neutral lead engages with either the first or second set of contacts prior to the blades selectively connecting the hot leads.
A triple pole, double throw switching device, comprising:
- a first set of contacts configured to be electrically connected to a first power source;
- a second set of contacts configured to be electrically connected to a second power source;
- a third set of contacts selectively connected to either the first set or second set of contacts;
- a switch member configured to establish an electrical connection between the first set of contacts and the third set of contacts in a first position and configured to establish an electrical connection between the second set of contacts and the third set of contacts in a second position, wherein the switch member establishes the electrical connection between a first contact in the third set of contacts and a corresponding first contact in either the first or second set of contacts prior to establishing the electrical connection between the remaining contacts in the third set of contacts and the corresponding contacts in either the first or second set of contacts, and wherein the switch member breaks the electrical connection between the first contact in the third set of contacts and the corresponding first contact in either the first or second set of contacts after breaking the electrical connection between the remaining contacts in the third set of contacts and the corresponding contacts in either the first or second set of contacts.
A method of transferring connection of an electrical load from a first power supply to a second power supply, each power supply and the load having a pair of power conductors and a neutral conductor, the method comprising the steps of:
- initiating motion of a switch member from a first position to a second position;
- disconnecting each of the power conductors for the load from the first power supply as a result of the continuing motion of the switch member while maintaining an electrical connection between the neutral conductor of the load and the neutral conductor of the first power supply;
- disconnecting the neutral conductor of the load from the neutral conductor of the first power supply as a result of the continuing motion of the switch member;
- connecting the neutral conductor of the load to the neutral conductor of the second power supply as a result of the continuing motion of the switch member while keeping the power conductors from the load disconnected from either power supply;
- and
- connecting the power conductors for the load to the second power supply as a result of the continuing motion of the switch member.
Dependencies are inferred from the claim text.