We offer a variety of Test Terminal Block / Test Blocks developed as per International Standards conforming to IEC- 60947-7-1
The test terminal blocks are used for easy access during on site testing of Ammeters, KWH Meters, Maximum Demand Indicators, Trivector Meters, Relays and Instrument Transformers without disconnecting from load and avoid CT open circuit problems. Connections for testing can be easily made. The Test Terminal Block therefore becomes an important element of the Metering Solution. The Test Terminals Blocks are designed for projection mounting with either front or back connection possibilities, designated with FC or BC. The Test Terminal Blocks are for 3 phase, 3 wire or 3 phase 4 wire application for up to 50 A continuous rating at 600 V.
- TTB 13 Way 3Ph 4 Wire FC ( Standard)
- TTB 13 Way 3Ph 4 Wire BC ( Standard)
- TTB 13 Way 3Ph 4 Wire FC & BC ( Disconnection Type )
- Test Block 4 Way
- Test Block 6 Way
- Test Block 10 Way
Test Terminal Block 13 Way 3Ph 4 Wire
The most popular 13 Way TTB has 13 Terminals in total, of which 9 are current terminals and 4 are voltage terminals. The current terminals are separated into groups of 3 with inter-terminal shorting links for shortcircuiting of the CT terminals and testing.
The base of the Test Terminal Block is made of excellent quality electrical grade black bakelite moulding powder. The base moulding is provided with integrally moulded barriers between the terminals for complete protection against flashovers. In addition, a bakelite shield is provided in front to avoid flashover or shorting at cable entries. A moulded shroud is provided for safety against the voltage terminals.
For viewing the inside connections without removing the cover, thus saving time of the Operator, a transparent, sturdy and flame retardant (UL94V0) polycarbonate top cover is provided. Optionally, the top cover is offered bakelite. The top cover is secured in place by knurled knobs and sealing arrangement is provided to prevent unauthorized access.
The Test Terminal Block can be fitted to any panel by means of 4 holes provided on the base.
All terminals, shorting links, screws, nuts, etc., used in the electrical connections are of are bright nickel-plated brass to prevent corrosion and providing high conductivity. The screws are provided with rounded edges to prevent any damage to cable strands. Each terminal has a 6 mm dia hole for cable entry and two M5 screws secure the cables.
For the Back Connected Test Terminal Blocks, colour coded sleeves of red, yellow and blue are provided to indicate
We offer 9 Way Test Terminal Blocks, special design 13 Way Terminal Blocks and Test Terminal Blocks with Voltage Disconnect against specific requirement.
TTB 13 Way 3Ph 4 Wire FC (Standard)
TTB 13 Way 3Ph 4 Wire BC (Standard)
TTB 13 Way 3Ph 4 Wire FC (Extd. Cover)
TTB 13 Way 3Ph 4 Wire FC & BC(Disconnection Type)
Test Blocks 4 Way - TTB4W
These 4 Way Test Blocks are used for mounting on switchboard panels for use with proper test equipments to facilitate the testing of AC instruments, meters and relays.
Technical Features
Type TTB4W test blocks are 4-pole blocks, provided with 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.
Contact rating is 250 volts, 10 amperes continuously.
Each TTB4 Test Block includes the Test Block and cover with a set of uncounted auxiliary contacts, jumpers, and screws in sufficient variety and quantity to provide the combinations to suit any application desired.
Details of the Auxilliary Contacts provided are as below:
Auxiliary contact C1 is equal to one pole of contact No. 1, to be used in connection with jumper shown in 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 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 plug is long delayed.
Auxiliary contact C4 jumpers is to be used in connection with auxiliary contact C2 or C4, to serve the same purpose as C2 in short circuiting a current transformer, or to interconnect phases, when the cover fastening stud is to be bypassed.
The Auxiliary contacts are furnished as a standard along with each TTB4w Test Block are - C1 - 1No., C2 - 2 Nos, C3 - 4 Nos. and C4 - 1 No.
TTB4W - 4 Way Test Blocks
Test Blocks 6 Way
We are engaged in manufacturing an extensive range Test Block 6 Way which are made by using premium quality raw material. These are known for smooth surface finish, long service life, durability and reliability. Our range caters to the needs of varied industries and are used in test equipment such as transformer ratio-meters and instrument transformer.
Test Block - 6 Way
Test Blocks 10 Way
The Test Blocks offer easy access for on site testing of Ammeters, KWH Meters, Maximum Demand Indicators, Trivector Meters, Relays and Instrument Transformers without disconnecting from load and avoid C.T. open circuit problems. Connections for testing can be easily made. The Test Block therefore becomes an important element of the Metering Solution.
The Test Blocks are designed for projection mounting with front connection possibilities, designated with FC. The Test Blocks are for 3 phase, 3 wire with Neutral application for up to 50 A continuous rating at 600 V and generally conform to IEC 60947-7-1.
The most popular 10 Way TTB has 10 Terminals in total, of which 6 are current terminals, 3 are voltage terminals and 1 are Neutral. The current terminals are separated into groups of 2 with inter-terminal shorting links for shortcircuiting of the CT terminals and testing.
The base of the Test Block is made of excellent quality electrical grade black bakelite moulding powder. The base moulding is provided with integrally moulded barriers between the terminals for complete protection against flashovers. In addition, a bakelite shield is provided in front to avoid flashover or shorting at cable entries. A moulded shroud is provided for safety against the voltage terminals.
We are engaged in manufacturing an extensive range Test Block 10 Way which are made by using premium quality raw material. These are known for smooth surface finish, long service life, durability and reliability. Our range caters to the needs of varied industries and are used in test equipment such as transformer ratio-meters and instrument transformer.
Test Block - 10 Way
