| Switch disconnector with fuse 250 A, Size 3, 3-pole for LV HRC fuse Sz. 0 and 1 Front operating mechanism left Basic unit without handle flat terminal |
| Model |
| Product brand name | SENTRON |
| Product designation | Switching device |
| Design of the product | 3KF switch disconnector with fuses |
| Design of the operating mechanism | without |
| Design of handle | Without |
| Direction of actuation | from the front |
| Type of the driving mechanism / motor drive | No |
| Number of poles | 3 |
| Size of disconnecting link | 1 and 0 |
| Size of switch disconnector | 3 |
| Size of fuse link | NH0, NH1 |
| Electrical endurance (switching cycles) | |
| at AC-23 A / at 440 V / at 50/60 Hz | 5 000 |
| at AC-23 A / at 690 V / at 50/60 Hz | 4 000 |
| at DC-23 A / at 440 V | 1 000 |
| I2t value | |
| with closed switch / for combination switch + fuse / at 500 V / maximum | 437 000 A²·s |
| with closed switch / for combination switch + fuse / at 400 V / maximum | 437 000 A²·s |
| with closed switch / at 690 V / for combination switch + gG fuse / maximum | 490 100 A²·s |
| of the fuse / at 500 V / maximum permissible | 1 500 000 A²·s |
| of the gG fuse / at 690 V / maximum permissible | 940 000 A²·s |
| of the aM fuse / at 690 V / maximum permissible | 1 400 000 A²·s |
| Mechanical service life (switching cycles) / typical | 10 000 |
| Position / of the switch operating mechanism | at the left end |
| Fuse system | LV HRC fuse |
| Overvoltage category | IV |
| Operating voltage / with current paths in series | |
| with degree of pollution 2 / at DC / rated value / Note | 440 / 3 |
| with degree of pollution 3 / at DC / rated value / Note | 440 / 3 |
| Insulation voltage / rated value | 1 000 V |
| Surge voltage resistance / rated value | 12 kV |
| Overvoltage in percent / relative to the operating voltage / at AC / at 50/60 Hz | 10 % |
| Protection class |
| Protection class IP | IP00 |
| Protection class IP | |
| with closed switch / with cover or cable lug cover | IP20 |
| on the front | IP00 |
| Dissipation |
| Power loss [W] | |
| with conventional rated thermal current / per pole | 15 W |
| with conventional rated thermal current / per device | 45 W |
| with conventional rated thermal current / without fuse / per pole | 15 W |
| with conventional rated thermal current / without fuse / per device | 45 W |
| for rated value of the current / at AC / in hot operating state / per pole | 15 W |
| of the fuse / per fuse / maximum | 25.5 W |
| Operating current | |
| at AC-21 A / at 400 V / maximum | 250 A |
| at AC-21 A / at 500 V / maximum | 250 A |
| at AC-21 A / at 690 V / maximum | 250 A |
| at AC-23 A / at 500 V / at 50/60 Hz / rated value / maximum | 250 A |
| at AC-22 A / at 500 V / at 50/60 Hz / rated value / maximum | 250 A |
| at AC-22 A / at 400 V / at 50/60 Hz / rated value / maximum | 250 A |
| at AC-22 A / at 690 V / at 50/60 Hz / rated value / maximum | 250 A |
| at AC-23 A / at 400 V / at 50/60 Hz / rated value / maximum | 250 A |
| at AC-23 A / at 690 V / at 50/60 Hz / rated value / maximum | 250 A |
| at DC-23 A / at 440 V / rated value / maximum | 250 A |
| at DC-23 A / at 220 V / rated value / maximum | 250 A |
| at DC-22 A / at 440 V / rated value / maximum | 250 A |
| at DC-22 A / at 220 V / rated value / maximum | 250 A |
| at DC-21 A / at 440 V / rated value / maximum | 250 A |
| at DC-21 A / at 220 V / maximum | 250 A |
| Continuous current | |
| rated value | 250 A |
| at 40 °C / rated value | 250 A |
| at 45 °C / rated value | 250 A |
| at 50 °C / rated value | 250 A |
| at 55 °C / rated value | 250 A |
| at 60 °C / rated value | 250 A |
| at 65 °C / rated value | 250 A |
| at 70 °C / rated value | 200 A |
| Continuous current / at DC / rated value | 250 A |
| Let-through current / of the fuse / at 500 V / maximum permissible | 33 700 A |
| Let-through current / of the gG fuse / at 690 V / maximum permissible | 37 700 A |
| Let-through current / of the aM fuse / at 690 V / maximum permissible | 39 700 A |
| Let-through current / with closed switch | |
| at 690 V / for combination switch + aM fuse / maximum permissible | 30 310 A |
| at 690 V / for combination switch + gG fuse / maximum permissible | 30 310 A |
| for combination switch + fuse / at 400 V / maximum permissible | 28 700 A |
| for combination switch + fuse / at 500 V / maximum permissible | 28 700 A |
| Short-time current resistance (Icw) / at 690 V AC/440 V DC / limited to 1 s / rated value | 8 kA |
| Main circuit |
| Operating power / at AC-23 A | |
| at 400 V / at 50/60 Hz / rated value | 132 kW |
| at 500 V / at 50/60 Hz / rated value | 160 kW |
| at 690 V / at 50/60 Hz / rated value | 250 kW |
| Operating voltage | |
| at AC / at 50/60 Hz / rated value | 690 V |
| at AC / rated value / maximum | 690 V |
| Auxiliary circuit |
| Number of connected NC contacts / for auxiliary contacts | 0 |
| Number of connected NO contacts / for auxiliary contacts | 0 |
| Number of connected CO contacts / for auxiliary contacts | 0 |
| Number of CO contacts / for auxiliary contacts | 0 |
| Number of NC contacts / for auxiliary contacts | 8 |
| Number of NO contacts / for auxiliary contacts | 8 |
| Suitability for use | |
| Main switch | Yes |
| switch disconnector | Yes |
| EMERGENCY OFF switch | Yes |
| safety switch | Yes |
| maintenance/repair switch | Yes |
| Product feature / interlock | No |
| Product component | |
| Phase failure monitoring | No |
| Voltage trigger | No |
| undervoltage release | No |
| undervoltage release with leading contact | No |
| Product feature / sealable | Yes |
| Product extension | |
| Auxiliary switch | Yes |
| optional | |
| — locking capability | Yes |
| — motor drive | No |
| — fuse monitoring | Yes |
| Product function | |
| fuse monitoring | No |
| Overvoltage protection monitoring | No |
| Short circuit |
| Short-circuit current making capacity (Icm) / for switch disconnector / at 690 V AC/440 V DC / without fuse link / rated value / minimum | 13.6 kA |
| Connections |
| Arrangement of electrical connectors / for main current circuit | Top and bottom |
| Tightening torque / with screw-type terminals | |
| minimum | 30 N·m |
| maximum | 44 N·m |
| |
| Type of connectable conductor cross-sections / for aluminum conductor / stranded / with lug | 1x (6 ... 240 mm²), 2x (6 ... 120 mm²) |
| Type of connectable conductor cross-sections / for copper conductor / stranded / with lug / acc. to DIN 46234 | 1x (6 ... 240 mm²), 2x (6 ... 120 mm²) |
| Type of connectable conductor cross-sections / for copper conductor / stranded / with lug / acc. to DIN 46235 | 1x (6 ... 240 mm²), 2x (6 ... 120 mm²) |
| Type of electrical connection | |
| for main current circuit | flat connector |
| Mechanical Design |
| Height | 207 mm |
| Width | 249.5 mm |
| Depth | 188.5 mm |
| Mounting position | any |
| Mounting type | floor mounting |
| Mounting type | |
| front mounting with 4-hole attachment | No |
| front mounting with central attachment | No |
| rail mounting | No |
| Net weight | 4 250 g |
| Environmental conditions |
| Degree of pollution | 3 |
| Ambient temperature | |
| during operation / minimum | -25 °C |
| during operation / maximum | 70 °C |
| during storage / minimum | -50 °C |
| during storage / maximum | 80 °C |
