| Switch disconnector 125 A, Size 2, 3-pole Front operating mechanism left Complete unit with direct operating mechanism gray Box terminal |
| Model |
| product brand name | SENTRON |
| product designation | 3KD switch disconnector |
| design of the product | Switch |
| display version / for switch position indicator manual operation | ON-OFF-TEST |
| design of the actuating element | Long rotary knob |
| type of the driving mechanism | Front operating mechanism |
| type of the driving mechanism / motor drive | No |
| General technical data |
| number of poles | 3 |
| type of device | fixed mounting |
| size of switch disconnector | 2 |
| mechanical service life (switching cycles) / typical | 15 000 |
| electrical endurance (switching cycles) | |
| ● at AC-23 A / at 690 V | 1 500 |
| ● at DC-23 A / at 440 V | 1 000 |
| I2t value | |
| ● with closed switch / at 1000 V / for combination switch +gG/aM SITOR fuse / maximum | 19 815 A²·s |
| ● of the fuse / at 500 V / maximum permissible | 223 005 A²·s |
| ● of the gG fuse / at 690 V / maximum permissible | 226 005 A²·s |
| ● of the gG/aM SITOR fuse / at 1000 V / maximum permissible | 48 000 A²·s |
| ● of the molded case circuit breaker / at 415 V / maximum permissible | 560 000 A²·s |
| position / of the switch operating mechanism | at the left end |
| overvoltage in percent / relative to the operating voltage / at AC / at 400, 500, 690 V / at 50/60 Hz | 10 % |
| overvoltage category | III |
| degree of pollution | 3 |
| Voltage |
| operating voltage / with current paths in series | |
| ● with degree of pollution 2 / at DC / rated value | 440 V / 3 |
| ● with degree of pollution 3 / at DC / rated value | 440 V / 3 |
| insulation voltage | |
| ● rated value | 1 000 V |
| surge voltage resistance / rated value | 8 kV |
| Protection class |
| protection class IP | IP20 |
| protection class IP | |
| ● with closed switch / with cover or cable lug cover | IP20 |
| ● on the front | IP20 |
| Dissipation |
| power loss [W] | |
| ● with conventional rated thermal current / per pole | 3.2 W |
| ● with conventional rated thermal current / per device | 9.6 W |
| ● for rated value of the current / at AC / in hot operating state / per pole | 3.2 W |
| Current |
| operational current | |
| ● at 35 °C / rated value | 125 A |
| ● at 40 °C / rated value | 125 A |
| ● at 45 °C / rated value | 125 A |
| ● at 50 °C / rated value | 125 A |
| ● at 55 °C / rated value | 125 A |
| ● at 60 °C / rated value | 125 A |
| ● at 65 °C / rated value | 125 A |
| ● at 70 °C / rated value | 125 A |
| ● at AC / rated value | 125 A |
| ● at AC-23 A / at 690 V / rated value | 125 A |
| ● at AC-23 A / at 500 V / rated value | 125 A |
| ● at AC-23 A / at 400 V / rated value | 125 A |
| ● at AC-22 A / at 1000 V / maximum | 125 A |
| ● at AC-22 A / at 690 V / rated value | 125 A |
| ● at AC-22 A / at 500 V / rated value | 125 A |
| ● at AC-22 A / at 400 V / rated value | 125 A |
| ● at AC-20 A / at 1000 V / maximum | 125 A |
| ● at AC-21 A / at 500 V / rated value | 125 A |
| ● at AC-21 A / at 690 V / rated value | 125 A |
| ● at DC-20 A / at 1000 V / maximum | 125 A / 1 |
| ● at DC-23 A / at 440 V / rated value / note | 125 A / 3 |
| ● at DC-23 A / at 220 V / rated value / note | 125 A / 2 |
| ● at DC-22 A / at 440 V / rated value / note | 125 A / 3 |
| ● at DC-22 A / at 220 V / rated value / note | 125 A / 2 |
| ● at DC-21 A / at 440 V / rated value / note | 125 A / 3 |
| ● at DC-21 A / at 220 V / rated value | 125 A / 2 |
| ● at DC-21 B / at 750 V / rated value / maximum | 125 A / 3 |
| continuous current / of upstream fuse / at 500 V and 690 V / rated value | 250 A |
| continuous current / of upstream fuse / at 1000 V / rated value | 250 A |
| continuous current / of upstream molded case circuit breaker / at 415 V / rated value | 160 A |
| operational current / at DC / rated value | 125 A |
| let-through current / of the fuse / at 500 V / maximum permissible | 25 700 A |
| let-through current / of the gG fuse / at 690 V / maximum permissible | 29 500 A |
| let-through current / of the aM fuse / at 690 V / maximum permissible | 32 900 A |
| let-through current / of the gG/aM SITOR fuse / at 1000 V / maximum permissible | 12 500 A |
| let-through current / of the molded case circuit breaker / at 415 V / maximum permissible | 22 500 A |
| short-time withstand current (Icw) | |
| ● at 400 V AC / limited to 0.15 s / rated value | 15 kA |
| Main circuit |
| operating power | |
| ● at AC-23 A / at 500 V / rated value | 75 kW |
| operational current / rated value | 125 A |
| 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 | 4 |
| number of NC contacts / for auxiliary contacts | 0 |
| number of NO contacts / for auxiliary contacts | 0 |
| Suitability |
| suitability for use | |
| ● main switch | Yes |
| ● switch disconnector | Yes |
| ● EMERGENCY OFF switch | No |
| ● safety switch | Yes |
| ● maintenance/repair switch | Yes |
| Product details |
| product feature / interlock | Yes |
| product component | |
| ● trip indicator | No |
| ● voltage trigger | No |
| ● undervoltage release | No |
| ● undervoltage release with leading contact | No |
| product extension / auxiliary switch | Yes |
| product extension / optional | |
| ● motor drive | No |
| ● voltage trigger | No |
| Short circuit |
| short-time withstand current (Icw) / at 1000 V AC/440 V DC / limited to 1 s / rated value | 4 kA |
| short-circuit current making capacity (Icm) / for switch disconnector | |
| ● at 400 V AC / without fuse link / rated value / minimum | 30 kA |
| ● at 1000 V AC / without fuse link / rated value / minimum | 12 kA |
| ● at DC 440 V / without fuse link / rated value / minimum | 12 kA |
| ● without fuse link / rated value / minimum | 12 kA |
| conditional short-circuit current / with line-side fuse protection | |
| ● at 415 V / by molded case circuit breaker / rated value | 65 kA |
| ● at 500 V / by gG fuse / rated value | 100 kA |
| ● at 690 V / by gG fuse / rated value | 100 kA |
| Connections |
| type of connectable conductor cross-sections / with flexible busbar | 3x (0.8x14 mm²) |
| type of connectable conductor cross-sections | |
| ● for copper busbar | '1 x (3 x 14 mm²) |
| type of connectable conductor cross-sections / for copper conductor | |
| ● solid | 1x (2.5 ... 16 mm²) |
| ● finely stranded / with core end processing | 1x (2.5 ... 70 mm²) |
| ● stranded | 1x (10 ... 70 mm²) |
| type of electrical connection / for main current circuit | box terminal |
| Mechanical Design |
| height | 126 mm |
| width | 121 mm |
| depth | 97 mm |
| fastening method | Screw fixing and standard rail mounting 35 mm |
| fastening method | |
| ● 4-hole front mounting | No |
| ● front mounting with central attachment | No |
| ● rail mounting | Yes |
| mounting position | any |
| net weight | 1 168 g |
| Environmental conditions |
| ambient temperature / during operation | |
| ● minimum | -25 °C |
| ● maximum | 70 °C |
| ambient temperature / during storage | |
| ● minimum | -50 °C |
| ● maximum | 80 °C |
Downloads and manuals |
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| Further information |
Information- and Downloadcenter (Catalogs, Brochures,…) |
Industry Mall (Online ordering system) |
Service&Support (Manuals, Certificates, Characteristics, FAQs,...) |
Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, ...) |
CAx-Online-Generator |
Tender specifications |
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Date 5/10/2022 | |