Protective relay switch having trap door

Details Protective relay switch having trap door Protective relay switch having trap door

1992-12-17

1994-03-08

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

335202, H01H 6702

Patent

active

052935213

ABSTRACT:
A protective switch device such as a relay switch is provided with at least one pole having contacts that can be separated. It includes a control mechanism (5) that can cause the opening and closing of contacts (21, 31) and that can be actuated by a protective device (4) that can act in case of electrical failure, and a manual control button (6) controlling an electromagnet (7) for operating the contacts. A moving trap door (11) opens and closes an opening of the box so as to make it possible to change the coil of electromagnet (7). The trap door (11) cooperates with a trap door locking element (81) that can be displaced between a closed position where it immobilizes the trap door on the box and an open position making it possible to open the trap door. The trap door locking element (81) is associated with a selective blocking element (82, 62) able to immobilize it in closed position when manual control button (6) occupies all positions other than the stop position and to free it so that a user can bring it into open position, making it possible to open the trap door, when manual control button (6) occupies the stop position.

REFERENCES:
patent: 4037184 (1977-07-01), Kimpesty et al.

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