|Minimum Order Quantity||1000 Piece|
|Pin Type||12 Pin|
hese 4 Way Test Blocks are used for mounting on switchboard panels for use with proper test equipment to facilitate the testing of AC instruments, meters and relays.Technical Features
Type TTB4W test blocks are 4-pole blocks, provided with a moulded bakelite base and covers that have an arrangement of internal plug contacts, which make a through positive connection when the cover is in place. The contacts in the blocks are of the line pressure type and provide positive contact, with minimum contact resistance. For all current circuits, auxiliary contacts are used which automatically short circuit the current transformer when the cover is removed. Routine testing can be accomplished simply by removing the cover and substituting the properly connected test plug. Thereafter, normal connections are restored by replacing the cover. The Contact rating is 250 volts, 10 amperes Continuous.
Each TTB4W Test Block includes the Test Block and cover with a set of several auxiliary contacts, jumpers, and screws in sufficient variety and quantity to provide the combination to suit any desired application. Some typical arrangements of these are shown in figures below. The price for the TTB4W Test Block includes the price for all mounting screws, nuts (for the studs, and for blocks for mounting on 1/8-1/2-inch, namely 3.2-12.7mm, thick panels) and bushings for the studs.Details of the Auxiliary Contacts provided are as shown below:
Auxiliary contact C1 is equal to one pole of contact No. 1, to be used in conjunction with jumper shown in the figure. Auxiliary contact C2
is used to short circuit the current transformer when the cover or plug is not in place.Auxiliary contact C3
is used as a bridge to maintain the circuit during the period that the cover or the plug is not in place. Without this connection, loss of revenue is possible because of interrupted operation if the replacement of the cover or fitment of the test plug is long delayed.Auxiliary contact C4
jumpers are to be used in connection with auxiliary contact C2 or C4, to serve the same purpose as Auxiliary Contact C2, namely to short circuit a current transformer or interconnect phases, when the cover fastening stud is to be by-passed.
The numbers of Auxiliary contacts , which are furnished as a standard accessory, along with each TTB4w Test Block are - C1 - 1., C2 - 2 , C3 - 4 . and C4 - 1
- Port of Dispatch: jnpt
- Production Capacity: 100000 p.m
- Packaging Details: export quality