OS250D21LR
Product ID:77437
Updated: 2026/4/3
Key Features
- 1Optimize performance with a knife contact design for reliable electrical life in extreme conditions. 2、Simplify installation and maintenance using a modular design with adjustable shafts. 3、Enhance safety with interlocking fuse covers that prevent opening while the switch is ON. 4、Ensure worldwide compatibility for voltages up to 690V and currents up to 400A. 5、Extend service life through self-cleaning contacts for maintenance-free operation.
Technical Specifications
Detailed engineering parameters
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Pollution Degree | 3 | Product Net Width | 297 mm |
| Product Net Height | 150 mm | Product Net Depth / Length | 218 mm |
| Product Net Weight | 5.2 kg 11.46 lb | Conventional Free-air Thermal Current (Ith) | Π= 40 °C 250 A |
| Conventional Thermal Current (Ithe) | Fully Enclosed 315 A | Fuse Size | NH0 NH1 |
| Fuse System | DIN | Handle Type | Handle and shaft not included |
| Mounting Type | Base mounting | Number of Poles | 3 |
| Operating Mode | Front Operated | Pollution Degree | 3 |
| Position of Line Terminals | Left In - Right Out | Power Loss | at Rated Operating Conditions per Pole 17 W |
| Rated Conditional Short-Circuit Current (Inc) | (690 V) 80 kA | Rated Current (In) | Main Circuit 250 A |
| Rated Impulse Withstand Voltage (Uimp) | 12 kV | Rated Insulation Voltage (Ui) | 1000 V |
| Rated Operational Current AC-21A (Ie) | (500 V) 250 A (690 V) 250 A | Rated Operational Current AC-22A (Ie) | (380 ... 415 V) 250 A (500 V) 250 A (690 V) 250 A |
| Rated Operational Current AC-23A (Ie) | (380 ... 415 V) 250 A (500 V) 250 A (690 V) 250 A | Rated Operational Power AC-23A (Pe) | (220 ... 240 V) 75 kW (400 V) 140 kW (415 V) 145 kW (500 V) 170 kW (690 V) 250 kW |
| Rated Operational Voltage | Main Circuit 690 V AC | Rated Short-time Withstand Current Low Voltage (Icw) | for 1 s 8 kiloampere rms |
| Standards | IEC 60947-3 | Switches Operating Mechanism | 21 (Between the Poles) |
| Terminal Type | Lug terminals | Terminal Width | 25 mm |
| Tightening Torque | 30 ... 44 N·m | Tightening Torque | 30 ... 44 N·m |
| Object Classification Code | Q | ETIM 8 | EC001040 - Fuse switch disconnector |
| ETIM 9 | EC001040 - Fuse switch disconnector | UNSPSC | 39122233 |
| IDEA Granular Category Code (IGCC) | 5291 >> Fuse switch disconnector | eClass | V11.1 : 27371401 |
| WEEE Category | 5. Small Equipment (No External Dimension More Than 50 cm) | Manufacturer ID | 1SCA022852R8330 |
Specifications may be subject to change without notice