Three-Pole Load Break Switches

Description

ABS Load Break Switches and Isolators for voltages ranging from 3.3KV to 36 KV offers a high technical standard and economy over the years for the switchgear manufacturer with dependability, reliability and versatility.

MAIN FEATURES

High operating reliability
Simple maintenance and inspection
High dynamic and thermal strength
Tested in CPRI as per IS-9920.
Special tubular arc-chutes.
Current interruption without visible
Simple driving mechanism

The salient feature of ABS Load Break Switch is its ability to permit load connections even under a short circuit condition without danger to the operating personnel. It complies with IEC. VOE and IS standards.

Main Features

• high operating reliability
• Simple maintenance and inspection
• high dynamic and thermal strength
• tested in CPRI as per IS-9920.
• special tubular arc-chutes.
• current interruption without visible arcs.
•simple driving mechanism

A high speed (snap action) make and break ensures. a fast switching action and the very special design of arc chutes having excellent extinguishing properties for both high and low currents, suitability of mounting in horizontal or vertical plane etc. prove the versatility of these switches.

Due to the compact design of individual cubicles, and the feasibility of mounting the switches in different directions, economy in space is achieved, with ample scope for future extension.

The triple pole Load Break Switch can be used for switching of Transformer feeders, overhead lines. Capacitor Banks, Cable feeders and Ring Mains.

For Protection against short circuits H.T. Fuses can be offered with the switch.

Accessories

1. FUSE PROVISION

• Fuse mounting arrangement for providing Din type or TAG type H.T. HRC fuses for short circuit protection is offered as a factory fitted accessory.

• Din type or Tag type H.T.HRC fuses of reputed make suitable for Transformer/Distribution applications can be supplied along with the Load Break Switch as OPTIONAL items. Details of rating etc depend upon application and make and necessary support to the customer in selecting the range of H.T.HRC fuses can be extended.

2. SHUNT TRIP COIL

Shunt trip coil release being offered for spring charged version Load Break Switches, are meant for remote tripping mainly and can be offered for different aux. voltages (indicated below) and the coils are of short time rated.
110V A.C 50 Hz
220V A.C 50 Hz
110V D.C
220V D.C
* Other voltages on request

3. AUXILIARY CONTACTS

This can be fitted on to the switch or isolator with a combination of 2n/O + 2n/c or 3n/O +3n/c + 1 wiping contact.

4. EARTH SWITCH

• This can be supplied as a factory assembled accessory with or without interlock with the main drive mechanism. The earthing switch _can be mounted either on incoming or outgoing side or at the bottom of the fuse base.

• Independent Earth switches with higher capacity are also available in the range for use in CIRCUIT BREAKER cubicles.

• The earth switch is also tested at CPRI for short-circuit withstand and peak making.

Technical Data

TECHNICAL DATA	TKL 3 12/630	TKL 3 12/1250	TKL 3 24/630
Rated Voltage	12 KV	12 KV	24 KV
Rated Frequency	50 Hz	50 Hz	50 Hz
Rated Current	630 A	1250 A	630 A
Rated Peak Current	80 KA	62.5 KA	80 KA
Rated Short time current/ 1 Sec.	31.5 KA	26.2 KA (3 Sec)	26 KA
Rated Making Current	80 KA	62.5 KA	36 KA
Rated Breaking Current Impulse Voltage, Wave Shape 1.2/50 MS	630 A	630 A	630 A
{i) To Earth	75 KV	75 KV	125 KV
{ii) Between Poles	75 KV	75 KV	125 KV
{iii) Between Open Contacts	85 KV	85 KV	145 KV
Power Frequency Test Voltage
{ i) To Earth	35 KV	35 KV	55 KV
{ii) Between Poles	35 KV	35 KV	55 KV
{ii) Between Open Contacts	45 KV	45 KV	75 KV
Breaking of Capacitance Load	50 A	50 A	25 A
Closed Loop breaking current COS <I> = 0.31 ND	630 A	630 A	630 A
Rated Transformer Off Load Breaking capacity	120 A	120 A	120 A
Rated Line Charging Breaking Capacity	90 A	90 A	90 A
Rated Cable Charging Breaking Capacity Dimensions {Ref. Drg. Enclosed)	90 A	90 A	90 A
{ j) Between Poles {Centres) mm	150-210	150-210	175-250
{ii) Between Open Contacts mm	140	140	235
{iii) Between live parts and earth mm	130	130	210
Making Time 35 M. Sec.
Arc Duration 5-20 M.Sec.

SELECTION TABLE

DESCRIPTION	TYPE REFERENCE
TKL 3 Load Break Switches in 11 KV 400/630 A can be ottered with pole distances of- 150mm or 210 mm in the following configuration.	D D – SA-AA D – UH D – UH -SA
1 . Basic ON/OFF Switch {Quick make, Quick Break) 2. Switch with mechanical tripping and shunt trip assembly 3. Switch with fuse base 4. Switch with fuse base and mechanical tripping feature

Note:

Any accessory, if required, should be specified in addition to the above type reference.