The Littelfuse LS7R dc series is an energy-efficient, compact disconnect switch that quickly breaks or resumes the flow of current safely to prevent shock hazards when trying to isolate circuits or repair systems. It is a 1500V DC disconnect for ungrounded systems.
Features & Benefits
- The patented operation system minimizes damage caused by arcs upon disconnection to increase product reliability and longevity
- Streamline design eliminates the need for external bridging links (jumpers) to lower heat dissipation for increased energy efficiency, decreased installation and maintenance time, and reduced footprint for added design flexibility
- High-level disconnection insulation provides a barrier to stop conduction when switch is in off position for added safety
- The self-cleaning blade contacts eliminate performance degradation (from increased electrical resistance over time) to ensure consistent behavior across the product’s lifespan
- The internally-located "sandwich-type" 2-contact symmetrical design mitigates the electromagnetic force of repulsion to offer enhanced functionality in short-circuit conditions
- Meets UL 94 flammability requirements with self-extinguishing/non-flammable materials to prevent fires
Applications
- Solar/PV systems: combiner boxes, recombiner boxes and inverters
- Energy storage systems: disconnection of batteries, containerized batteries
- Oil & gas: DC drives
- Railway: earthing switches and battery disconnection
- UPS: switching and isolation of batteries
- Electrical vehicle chargers
Specifications
| Total Voltage Rating | 1500V DC |
|---|---|
| Amperage Rating | 500 Amps |
| SCCR Rating | 10 kA |
| Ambient Temperature | -20 to 50°C (-4 to 122 °F) |
| Insulation Voltage Rating Ui | 1500V DC |
| Impulse Withstand Voltage Rating Uimp | 12 kV |
| Operational Current DC21B Rating | 500 Amps / 1500V DC |
| Power Losses at 500 Amps | 33.05 watts |
| Maximum Busbar Connection Range | 2 bars x 5 mm (.20") H x 32 mm (1.25") L |
| Number of Circuits/Switches | 1 |
| Tightening Torque | 212 lbf-in (24 N•m) |
| Material |
Plastic housing, silver-plated copper terminals |
| Base Mounting | Screws |
Recommended Accessories
- Panel Handle with Shaft LDSSA11
- For closed panel door access
- Direct Handle LDSSI11
- For open panel door access
- Auxiliary Contact LDMAU11
- Remotely indicates switch position
- Spacers LDMEL11
- Increase distance between switch and mounting plate
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