| SENTRON, Switch disconnector 3LD, emergency switching-off switch, 3- pole, Iu: 80 A, operating power / at AC-23 A 400 V: 22 kW, floor mounting, knob-operated mechanism, red/yellow |
| Model |
| Product brand name | SENTRON |
| Product designation | 3LD Switch disconnector |
| Design of the product | EMERGENCY-STOP switch |
| Display version / for switch position indicator manual operation | 1 ON - 0 OFF |
| Design of the operating mechanism | selector switch |
| Design of handle | knob-operated mechanism, red/yellow |
| Type of the driving mechanism / motor drive | No |
| General technical data |
| Number of poles | 3 |
| Type of device | fixed mounting |
| Type of switch | Screw fixing |
| Size of switch disconnector | 2 |
| Electrical endurance (switching cycles) / at AC-23 A / at 690 V | 6 000 |
| I2t value / with closed switch / at 690 V / for combination switch + gG fuse / maximum | 9 kA2.s |
| Let-through I2t value / with closed switch / at 440 V / for combination switch + gG fuse / maximum | 9 kA2.s |
| Mechanical service life (switching cycles) / typical | 60 000 |
| Operating frequency / maximum | 50 1/h |
| Voltage |
| Insulation voltage / rated value | 690 V |
| Surge voltage resistance / rated value | 6 kV |
| Current / at AC / rated value | 80 A |
| Operating voltage | |
| at AC / at 50/60 Hz / rated value | 690 V |
| Protection class |
| Protection class IP | IP44 |
| Protection class IP / on the front | IP44 |
| Dissipation |
| Power loss [W] | |
| for rated value of the current / at AC / in hot operating state / per pole | 4.5 W |
| per conductor / typical | 4.5 W |
| Current |
| Operating current | |
| at AC-21 / at 690 V / rated value | 80 A |
| at AC-21 A / at 240 V / rated value | 80 A |
| at AC-21 A / at 440 V / rated value | 80 A |
| Continuous current | |
| rated value | 80 A |
| at 40 °C / rated value | 80 A |
| at 45 °C / rated value | 80 A |
| at 50 °C / rated value | 80 A |
| at 55 °C / rated value | 80 A |
| Operating current / of upstream fuse / rated value | 40 A |
| Let-through current / with closed switch | |
| at 440 V / for combination switch + gG fuse / maximum | 4.5 kA |
| at 690 V / for combination switch + gG fuse / maximum permissible | 4.5 kA |
| Short-time withstand current (Icw) | |
| limited to 1 s / rated value | 340 A |
| at 690 V / limited to 1 s / rated value | 340 A |
| Main circuit |
| Operating frequency | |
| initial value | 50 Hz |
| Full-scale value | 60 Hz |
| Operating power | |
| at AC-23 A / at 240 V / rated value | 22 kW |
| at AC-23 A / at 400 V / at 50/60 Hz / rated value | 22 kW |
| at AC-23 A / at 400 V / rated value | 22 kW |
| at AC-23 A / at 440 V / rated value | 22 kW |
| at AC-23 A / at 690 V / rated value | 22 kW |
| at AC-3 / at 240 V / rated value | 18.5 kW |
| at AC-3 / at 400 V / rated value | 18.5 kW |
| at AC-3 / at 690 V / rated value | 18.5 kW |
| Operating current / rated value | 80 A |
| Auxiliary circuit |
| Number of CO contacts / for auxiliary contacts | 0 |
| Number of NC contacts / for auxiliary contacts | 0 |
| Number of NO contacts / for auxiliary contacts | 0 |
| Operating voltage / of auxiliary contacts / at AC / maximum | 500 V |
| Continuous current / of the auxiliary contact / rated value | 10 A |
| Insulation voltage / of the auxiliary switch / rated value | 500 V |
| Suitability |
| Suitability for use | |
| Main switch | Yes |
| switch disconnector | Yes |
| EMERGENCY OFF switch | Yes |
| safety switch | Yes |
| maintenance/repair switch | Yes |
| Appearance |
| Color / of the actuating element | red |
| Short circuit |
| Conditional short-circuit current / with line-side fuse protection | |
| at 690 V / by gG fuse / rated value | 50 kA |
| Number of connectable NC contacts / for auxiliary contacts / attachable / maximum | 2 |
| Number of connectable NO contacts / for auxiliary contacts / attachable / maximum | 2 |
| Number of connectable CO contacts / for auxiliary contacts / attachable / maximum | 0 |
| Connections |
| Type of electrical connection | |
| for main current circuit | box terminal |
| for auxiliary contacts | connection terminals |
| Requirements |
| Design of the fuse link | |
| for short-circuit protection of the main circuit / required | Fuse gL/gG: 80 A |
| for short-circuit protection of the auxiliary switch / required | fuse gL/gG: 10 A |
| Mechanical Design |
| Height | 64 mm |
| Width | 64 mm |
| Depth | 93 mm |
| Mounting type | Built-in unit fixed-mounted version |
| Mounting type | |
| front mounting with 4-hole attachment | No |
| front mounting with central attachment | No |
| rail mounting | Yes |
| Net weight | 301 g |
| Environmental conditions |
| Ambient temperature / during operation | |
| minimum | -25 °C |
| maximum | 55 °C |
| Ambient temperature / during storage / minimum | -25 °C |
