Contactor-Fuse-Combination 3TL62 / 3TL63 / 3TL66
Compact for easy integration
- Description
- Construction and Integration
- Switching Duties
- Technical Data
- Dimensions
The contactor-fuse combinations 3TL62/63/66 are type-tested units of the successful 3TL6 contactors and HV HRC fuses. A fuse holder for two fuses per phase and a control transformer for power supply have been integrated. This enables frequent switching of high normal currents in a compact space. Due to their high reliability, the contactor-fuse combination 3TL6 is used where frequent and safe switching is required, no matter whether it is for three-phase motors, transformers, reactors, capacitors or ohmic loads. With up to one million operating cycles, the contactor-fuse combinations ensure optimum availability. Their advantage: High safety and reliability due to maintenance-free systems.
The arrangement of the components on the base plate provides for optimum ventilation and thus, a high normal current, supported by the especially developed fuse holder which ensures a uniform distribution of the current. Even high requirements regarding the dielectric strength – as requested in countries like China – are fulfilled with this design.
The contactor-fuse combinations 3TL6 are suitable for application on withdrawable parts and fixed-mounted assemblies. For easy integration bushings and various widths across flats are available.
There are many different versions of contactor-fuse combinations available, e.g. for one or two fuses per phase, with or without control transformer.
Construction of the Contactor-Fuse-Combination 3TL6
| 1 Vacuum contactor | 8 Front cover |
| 2 Insulating cover with fuse holder | 9 Fuse trip indicator |
| 3 Fuse-link | 10 Position indicator |
| 4 Isolating contacts | 11 Integral rocker |
| 5 Optional control transformer | 12 Terminal strip |
| 6 Base plate | 13 Primary fuse |
| 7 Cross-member |
Integration of a contactor-fuse combination in a switchgear panel
| A Switching device compartment |
| B Busbar compartment |
| C Connection compartment |
| D Contactor-fuse combination |
| E Low-voltage compartment |
Switching of three-phase motors in AC-3 or Ac-4 operation
Switching of three-phase motors in AC-3 or Ac-4 operation
(eg in conveying and elevator systems, compressors, pumping stations, ventilation and heating)
Vacuum contactors are especially suitable for frequent operation of motors. As the chopping currents of the contactors are ≤ 5 A, no unpermissibly high overvoltages are produced when started motors are switched during normal operation. However, when high-voltage motors with starting currents of ≤ 600 A are stopped during start-up, overvoltages may arise. The magnitude of these overvoltages can be reduced to harmless values by means of special surge limiters.
Switching of transformers
(e.g. in secondary distribution switchgear, industrial distributions)
When inductive currents are interrupted, current chopping can produce overvoltages at the contact gap. Such overvoltages can be controlled with a protective circuit composed of 3EF surge limiters.
Switching of capacitors
(e.g. in power factor correction systems, capacitor banks)
3TL vacuum contactors can interrupt capacitive currents up to 250 A up to the rated voltage of 12 kV without restrikes, and thus without overvoltages.
Switching of reactors
(e.g. in industrial distribution systems, DC-link reactors, power factor correction systems)
Switching of resistive consumers
(e.g. heating resistors, electrical furnaces)
| 3TL62 | 3TL63 | 3TL66 | |
| Standard | IEC 60470 | IEC 60470 + additional increased dielectric requirements | IEC 60470 |
| Rated voltage Ur | 7,2 kV | 7,2 kV | 12 kV |
| Rated normal current Ie (depending on installation and selected fuses) | 450 A | 400 A | 400 A |
| Thermal current Ith | depending on installation and selected fuses | ||
| Rated short-circuit breaking current ISC (prospective) | 50 kA | 50 kA | 40 kA |
| Max. let-through current ID | 46 kA | 46 kA | 46 kA |
| Short-circuit capability of contactor (Limit switching capacity) | 5 kA | 4,5 kA | 4,5 kA |
| Rated lightning impulse withstand voltage (to earth / open contact gap) | 60 kV / 40 kV | 60 kV / 40 kV | 75 kV / 60 kV |
| Rated short-duration powerfrequency withstand voltage | 20 kV | 32 kV | 28 kV |
| Switching rate | 1200 operating cycles / h | 600 operating cycles / h | 600 operating cycles / h |
| Mechanical endurance | 1 Mio operating cycles | 1 Mio operating cycles | 1 Mio operating cycles |
| Number of fuses per phase max. 1) | 1 x 315 A or 2x 250 A |
1 x 315 A or 2x 250 A |
1 x 200 A or 2 x 200 A |
| Pole-center distance in mm | 120 | 120 | 120 |
| Width across flats in mm | 205, 275, 310 | 205, 275, 310 | 205, 275, 310 |
1) relating to Siemens 3GD2 or SIBA fuses (motor protection characteristics)
| IEC 62271-1 |
| IEC 60470 - Issue 2000 |
| IEC 62271 - 106 CDV 01´2010 |
| IEC 60529 |
| IEC 60721 |
| IEC 60282-1 |
| Test voltages according to D/L 404, GB 14808, DL/T 593 |
Installation space and fitting
Minimum size of dielectric pitch
| Width across flat | D in mm |
|
| in mm | 13. digit | |
| 205 | "0" | ≥ 26 |
| 275 | "1" | ≥ 26 |
| 310 | "2" | ≥ 60 |
Dimension Drawing
| Medium-voltage connection | A | B | C | ||
| Circular plug-in contact | 310 | 275 | 205 | 717 | 94 |
| With flatbolted connection | 310 | 275 | 205 | 719 | 81 1) |
1) Value from center drill-hole
Bushing
Download - Catalogue
Contactor-Fuse-Combination 3TL62 / 3TL63 / 3TL66