Littelfuse launches DC disconnect switch product line

Steve_S

Offgrid Cabineer, N.E. Ontario, Canada

Littelfuse launches DC disconnect switch product line​

By Kelly Pickerel | November 12, 2020

Littelfuse has released its DC Disconnect Switch product line. The Littelfuse LS6 (available in 1,000 and 500 V) and the LS6R (available in 1,500 V) series consists of energy-efficient, compact disconnect switches that quickly break or resume the flow of current safely. Offered in both 250 and 400 amperage ratings, these switches prevent shock hazards when isolating circuits or repairing systems.

“The LS6 and LS6R DC disconnect switches have a streamlined design to eliminate the need for external bridging links or jumpers to lower heat dissipation,” said Craig Greeson, Littelfuse Industrial Business Unit Product Manager. “This increases energy efficiency as well as decreases installation and maintenance time for applications in photovoltaic and energy storage systems, oil and gas, railway, and uninterrupted power systems.”

The LS6R offers a patented operation system that minimizes damage caused by arcs upon disconnection to increase product reliability and longevity.

Key benefits of both the LS6 and LS6R series of DC disconnect switches include:

  • a high-level disconnection insulation to provide a barrier to stop conduction when switch is in off position for added safety
  • self-cleaning blade contacts that eliminate performance degradation (from increased electrical resistance over time) to ensure consistent behavior across the product’s lifespan
  • an internally-located “sandwich-type” 2-contact symmetrical design to mitigate the electromagnetic force of repulsion to offer enhanced functionality in short-circuit conditions
  • Meeting UL 98B, UL 94, and IEC 60947-3 standards
For more product information visit: Littelfuse.com/DcDisconnectSwitch
 

Maast

Compulsive Tinkerer
Huh, single AND double pole product lines and they're UL listed meaning they can be used on NEC compliant installs. Good find.
 

Steve_S

Offgrid Cabineer, N.E. Ontario, Canada
Littlefuse, Bussman are now Eaton Companies. There are new products coming to fruition as a result of the grand mergers. Eaton has a definite focus on Renewable Energy Systems and they are cooking up some serious goodness for 2021, there are little parts starting to appear like Smart Panels (AC Panels & Sub-panels) and more. All 3, Littlefuse, Bussman & Eaton are all Top Quality products you can depend on.
 

rhino

Solar Enthusiast
Any idea when these Littlefuse disconnect switches would be available for purchase or who has them in stock?
 

Steve_S

Offgrid Cabineer, N.E. Ontario, Canada
Any idea when these Littlefuse disconnect switches would be available for purchase or who has them in stock?
Sadly I do not know that detail. There are many "similar" or "clones" that appear like these BUT the makers can be, well, let's just say, stick to Known Good Quality products. That being said, BlueSea Systems carries a LOT of Eaton/Bussman components and will also likely carry these soon if not already. You CAN trust BlueSea products.

 

rhino

Solar Enthusiast
Sadly I do not know that detail. There are many "similar" or "clones" that appear like these BUT the makers can be, well, let's just say, stick to Known Good Quality products. That being said, BlueSea Systems carries a LOT of Eaton/Bussman components and will also likely carry these soon if not already. You CAN trust BlueSea products.

I have trouble understanding the Blue Sea specs since they would say max 48V for battery switch.. That is not adequate for a 48V nominal battery bank unless they are just being sloppy with their "specs"? in which case that makes me worried as well unless I am looking in wrong area.
 

Hedges

Photon Sorcerer
250A rating, 10kA SCCR


SCCR: “The maximum short circuit current a component, assembly, or equipment can safely withstand when protected by a specific overcurrent protective device, or for a specified time interval.”


So that switch should be good for a moderate size battery bank (or with enough wire length to limit peak current) and a suitable fuse. But it can't be used to manually switch off a short circuit, 10kA isn't an interrupt rating like fuse or breaker has.

A "current limiting" fuse should allow the switch to be used with a battery having higher short circuit current. Doesn't actually limit peak current, but clears fast enough to protect a lower rated breaker (or switch in this case.)

The IMO switches mention PV array disconnect, don't appear to have SCCR which would be needed for batteries.

 
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