Electrical protection devices and systems
An electrical protection system has connection terminals, separable electrical contacts, a switching mechanism and at least one power switch connected in series with the separable electrical contacts, the switching mechanism including a displaceable control member. The electrical protection system further includes an electronic control circuit coupled to the at least one power switch and a sensor coupled to the control member for measuring a position of the switching mechanism. The electronic control circuit is configured to switch the at least one power switch to a blocking state when the sensor detects that the switching mechanism reaches a position preceding a position in which the electrical contacts separate.
1 . An electrical protection system, comprising:
connection terminals,
separable electrical contacts connected between the connection terminals,
a switching mechanism and at least one power switch connected in series with the separable electrical contacts, the separable electrical contacts being movable between an open state and a closed state, the switching mechanism comprising a movable control lever and being coupled to the separable electrical contacts to switch the separable electrical contacts to the open state,
an electronic control circuit coupled to said at least one power switch,
a sensor coupled to the control lever to measure a position of the switching mechanism,
wherein the electronic control circuit is configured to switch said at least one power switch to an off state when the sensor detects that the switching mechanism has reached a position preceding a position from which the separable electrical contacts separate,
wherein a movement of the control lever of the switching mechanism is configured to cause an angular offset between the rotation of the control lever and moving to the open state of the separable electrical contacts, wherein the angular offset enables compensating for a reduction in a clearance of the separable electrical contacts caused by wear of the separable electrical contacts.
2 . The electrical protection system as claimed in claim 1 , wherein the electronic control circuit is configured to switch said at least one power switch to the off state when an electrical fault is detected by a measuring circuit.
3 . The electrical protection system as claimed in claim 1 , wherein the electrical protection system comprises an internal electrical power supply configured to electrically power the electrical control circuit using the electrical voltage across the connection terminals.
4 . The electrical protection system as claimed in claim 1 , wherein said at least one power switch is a MOSFET.
5 . The electrical protection system as claimed in claim 1 , wherein said at least one power switch is normally open.
6 . The electrical protection system as claimed in claim 1 , wherein the electronic control circuit comprises a plate-shaped substrate and a conductive plate making contact with a metal backing of said corresponding at least one power switch, said at least one power switch and its respective conductive plate being mounted on one or each face of the substrate.
7 . The electrical protection system as claimed in claim 6 , wherein at least one of the conductive plates comprises a segment configured to form a fixed electrical contact that interacts with a mobile electrical contact to form together said separable electrical contacts.
8 . The electrical protection system as claimed in claim 1 , wherein the switching mechanism is a toggle mechanism.
9 . The electrical protection system as claimed in claim 1 , wherein the electrical protection system is configured such that, to close the separable electrical contacts, the control lever is configured to be moved to the corresponding position by a user, this movement, by way of a link rod of the switching mechanism, driving a hook of the switching mechanism to rotate, the hook becoming hooked on a tripping bar of the switching mechanism, the link rod then driving a deck of the switching mechanism to rotate until the separable electrical contacts close.
10 . The electrical protection system as claimed in claim 1 , wherein the electronic control circuit is configured to switch said at least one power switch to an off state when the sensor detects that the switching mechanism has reached a position immediately preceding a position from which the electrical contacts separate.
11 . An electrical protection device comprising a casing and the electrical protection system as claimed in claim 1 , wherein the electrical protection device is a miniature circuit breaker.
12 . The electrical protection device as claimed in claim 11 , wherein the electronic control circuit and said at least one power switch are housed in a dedicated compartment inside the casing.
13 . The electrical protection device as claimed in claim 11 , wherein the width of the casing is a multiple of 9 mm.
14 . An electrical protection device comprising a casing and the electrical protection system as claimed in claim 1 , wherein the electrical protection device is an air circuit breaker.