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Service Entrance Protection

The 300LS Series offers robust protection at the entrance of large, Cat. C facilities. The 300LS has an Ipeak of 300,000A/phase (8 x 20microsecond waveform). Seven times redundant protection paths/phase ensures continuous protection, even in an unlikely fault situation. Ten-year, no-nonsense warranty; FREE protection modules for LIFE. Series features mix and match options for a customized protector at stock prices. (See below for options.)



  • 300LS: I peak=300,000A/Phase
    (8 x 20µs waveform)
Filter Attenuation MIL STD 220A (50 Ohm):
  120VAC 220VAC 240VAC 277VAC 347VAC 480VAC
-30db 25kHz 25kHz 25kHz 50kHz 50kHz 50kHz
-40db 125kHz 180kHz 180kHz 100kHz 100kHz 100kHz
-50db 210kHz 210kHz 210kHz 180kHz 170kHz 170kHz
-60db 250kHz 250kHz 250kHz 200kHz 190kHz 190kHz
  • Meets UL1449 3rd Ed - 1996,
    NEMA LS1-1992
  • Seven times redundant protection paths
    per phase
  • Employs new 40kA varistors with built in
    high speed thermal disconnect
  • Solid copper bus bar construction
  • Field-replaceable modules
  • EMI/RFI noise filtering
  • Continuously  monitored protection
  • Internal and external status indicators
  • NEMA 4 enclosure
  • 20-year warranty on unit, lifetime warranty
    on protection modules

Surge Current/Phase (8/20µs):

1 Event - 300kA.

Surge Life/Phase (8/20µs):

10,000 Events: 13kA.
Status Indicators: LED Status Indicators (internal & external)
Modes of Protection: L-N, L-G, L-L, N-G
Operating Altitude: 13,000ft. (4000m)
Temp. (Operating/Storage): -40° to +70°C/-40° to +85°C
Enclosure: NEMA 4, 14 gauge steel
Dimensions: 17" x 15" x 6" (432 x 381 x 153mm)
Mounting: 17.75" x 13"/.313"ID - 4 holes
(451 x 330mm/7.9mm ID) -4 holes
Weight: 35 lbs. (16.7kg)


300LS Specifications

Mix & Match!

Options Available:
•Internal Disconnect
•NEMA 4X Enclosure
•Low Impedance Micro-Z cable
•Upgradeable Diagnostics: Surge Event Counter, Beeper, & Status Relay (1 Form C Contacts)

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© 2004 Sentinel Power Inc. All rights reserved.
Last Updated 06/13/12