DE7911166U1 - Test terminal with assigned isolating plug - Google Patents

Description

15/3

\ CA. Weidmüller KG, iaderborner Str. 175, 4930 Detmold

\ _v Test terminal with assigned isolating plug

The innovation relates to a test terminal with at least two / one metal parts formed as connections can be connected to one another by a disconnecting plug, as well as with a device for preventing a incorrect contact.

\ ~ - Particularly when checking ammeters, which are ^% powered by a current transformer, must be in each

l ") moment are prevented that the secondary currents circuit is open, otherwise dangerous voltages

; ^; 10 genes can occur. This applies both when a test instrument is switched on in the secondary circuit and when the ammeter is removed or replaced.

In known test terminals of the generic type (DE-PS 601 908) there is a device for prevention a faulty contact is that in the test terminal a disconnect plug between one of the two Connections connecting position and the electrical connection therebetween interrupting position is displaceable and can be fixed in the positions mitteis screws, with the connector that is on

Approx. Weidmüller KG

■ f

the connections of the terminal is put on, in its operating position the separating piece in terms of accessibility of the screws by folding up a lever that is otherwise located above the screws of the separator unlocked, but the connector in turn when the isolating plug is in the open position is locked by this in its position and only after transferring the isolating plug into its other

( Position can be pulled out of the test terminal again. Apart from the fact that human error

v ten is also not excluded here, because in fact Forget about the necessary displacement of the isolating plug and its fixation with the screws v / can ground, this device is complicated in structure and especially in operation.

The present innovation is therefore based on the task of developing a test terminal of the generic type regarding the device to prevent a

(design faulty contact in such a way that the ■ "β *. si

Furnishing with a very simple constructive f

Ck construction forcibly works automatically. |

The solution according to the innovation consists in a test! |

clamp of the generic type in that the input I

direction has a clamp-shaped contact spring which makes resilient contact with the terminals of the clamp and the connecting lugs of the connections extend further beyond the contact spring than one for spreading the contact spring formed insulating nose of an insertable into the terminal, the device connections containing isolating plug protrudes over its contacts.

Approx. Weidmüller KG

10

15th

If, in this embodiment, the isolating plug containing the device connections is inserted into the test terminal, the secondary circuit is initially through contacting the contact spring at the terminals of the terminal closed. In the case of the embodiment highlighted in the characterizing part, it now happens in any case initially to an electrical contact between the contacts of the isolating plug and the connecting lugs the connections of the test terminal while maintaining contact with the contact spring, before this then with further insertion of the isolating plug from its insulating nose under abandonment of the contact to the terminals of the terminal is spread out resiliently. When pulling out the isolating plug these things happen in reverse order. In either case, it is completely automatic and inevitable The secondary circuit is not opened in any single operating phase.

Further refinements of the subject of the innovation are characterized in the subclaims.

An embodiment of a test terminal according to the innovation is described in more detail below with reference to the drawing.
Show it

Fig.

30th

Fig. 2
3 and 4

a simplified side view of a test terminal with an assigned isolating plug,

Cross-sectional views through the test terminal and the isolating plug in three different ways Insertion phases of the isolating plug.

Approx. Weidmüller KG

ι ι ι ι ι ·

- 5 -

The test terminal shown, the insulating material housing 1 of which can be fixed on a standard mounting rail via a locking foot 2, contains two metal parts 3 in its interior, which are designed as connections and each have several connection lugs for this purpose. The two metal parts 3 are respectively f at their mutually facing ends in the lower region of a clamp-like bent contact \ spring contact 5 resiliently. The contact spring 5 has for this purpose in the contact area to the metal parts

* Len ~ ^f 3 on both sides each Kontaktausbuchtungen 6, which ensure a particularly reliable and good contact with the metal parts. 3 The clamp-shaped contact spring 5 is open at the top and is provided with a small expansion 7 in its upper area on its two legs.

The test terminal is also assigned an isolating plug, on whose insulating housing 8 on the

£ ") an insulating material nose to be inserted into the test terminal 9 protrudes and the further the

^ ■ 'includes the key of the device to be connected, in particular the corresponding connection contacts 10.

The arrangement is now such that the terminal lugs 4 of the two metal parts 3 in the area the contact spring 5, protrude further upward beyond the contact spring 5 than the insulating nose 9 protrudes over the contacts 10 of the isolating plug. Thanks to this configuration, there is inevitable and automatically when the isolating plug is inserted into the test terminal as shown in FIGS. 2 to 4 individually illustrated contact sequence. At the beginning of

Approx. Weidmüller KG _:

I insertion of the separating plug (Fig. 2) are the I Kontaktausbuchtungen 6 of the contact spring 5 or Fe-I horror at the two metal parts 3 on, is such that in I of this phase thereby closed the secondary circuit of the I 5 a current meter having current transformer overall ^T . The two connecting lugs 4 begin entering the Tre.in plug. I is the separating plug further inserted (Fig. 3) comes I f \ es to a contact between the terminal lugs 4 I 10 of the metal pieces 3 of the test clip with contacts 1 \) 10 of the separating plug. Thanks to the chosen Ausgestal-I device .Has, however, the insulating nose 9 has not yet reached the upper jjij end of the contact spring 5 provided with the spread 7, so that the contact spring 5 also makes the two metal parts 3 contacts. Only when you continue to insert the disconnect

% kers (Fig. 4) it occurs while maintaining the

I contact between the terminal lugs 4 and the

1 contacts 10 for spreading the contact spring ff ") 20 5 through the insulating nose 9 with cancellation

ji of the contact between the contact spring and the two

1 ( ) tallteile 3. When pulling out the isolating plug

I did these things in reverse order.

I The secondary circuit is closed in each phase

h 25 sen.

Claims (1)

e r * a r 9 m ·> ■■!> / CA. Weidmüller KG claims for protection 1. Test terminal with at least two metal parts designed as connections, which are connected by a disconnecting plug ^w can be connected to each other, as well as with a device Cy device to prevent faulty contact, characterized in that the device has a clamp-shaped contact spring (5) resiliently contacting the connections (3, 4) and the connection lugs (4) of the connections extend further beyond the contact spring (5), as an insulating material nose (9) designed to spread open the contact spring (5) of an isolating plug containing the device connections and to be inserted into the test terminal protrudes beyond its contacts (10). Test terminal according to Claim 1, characterized in that the contact spring (5) has contact bulges on both sides (6). Test clamp according to Claim 1, characterized in that that the contact spring (5) has expansions (7) at its upper end.