Units for detecting differential currents in electric systems |
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| 申请号 | EP88120982.9 | 申请日 | 1988-12-15 | 公开(公告)号 | EP0320931A3 | 公开(公告)日 | 1990-08-29 |
| 申请人 | Elettrocondutture S.p.A.; | 发明人 | Monterosso, Raffaello; | ||||
| 摘要 | This unit comprises a box-like body associable, side by side, with electric switches and selective safety means adapted to avoid unintentional errors in coupling and including rod-like guide elements (3,3a) protruding from the coupling wall (1a) of said unit and intended to be inserted within corresponding cavities (4,4′) in the body of the switch (2). The rod-like elements (3,3a) have a constant transverse cross section while the corresponding cavities (4,4′) provided in the body of the switch have such dimensions and depth as to allow the complete insertion of said rod-like elements only when the nominal currents of the switch are equal or lower than those of the unit. In particular, the cavities (4) provided in a high nominal current switch have a portion (4a) with smaller transverse cross section than the inlet portion (4b), so as to prevent the complete insertion of said rod-like elements (3) if the nominal current of the differential unit is lower than that of the switch. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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