Standard TVSS features plus “Sine Tracking" high frequency filtering to provide ultra pure power for your most sensitive instrumentation.


Features very low let-thru voltages for costly and critical equipment. Up to 250 KW systems, Category B locations.

The StediWatt SURG’TRACER Series is intended for industrial, commercial secondary-level protection. It provides a safe, critical surge path direct to ground and isolates downline Category A environments from heavy surges, storm and utility line hazards, and internal electrical pollution. AST* (Active Sine-Tracing) and filtering network maintains spec-grade power quality by providing very low let-thru voltages to components. Ideal for hazard-prone areas where critical, system-dependent equipment or expensive downtime risk is a factor. This series is a must to ‘close the glitch-gate’ and prevent serious power surging from damaging your facility’s sensitive automated equipment.

  • For 120VAC, Single Ø - up to 480VAC 3Ø Systems
  • MCOV Ratings: 150/320; 320/550; 390/680 VAC Max. (typ.)
  • Maintains SE* Single Element Surge Capacity: 45,000 Amps
  • Minimum Surge Current Per Phase: 135,000 Amps
  • Total Non-degrading Surge Capacity: 335,000 Amps
  • All Modes of Protection: L-L, L-N, L-G and N-G (if applies)
  • Leads are #10 Stranded Copper, Max 36" for Close-coupling
  • FuseLink Technology Maintains Full Rated Surge Capacity
  • User Safe, StediWatt Safety Surge Cushion™ *Patent Pending
  • UL and CUL Listed to Standard 1449, 2nd Edition
  • USafety tested to ANSI/IEEE C62.11,C62.41 & C62.45 Std. 587
  • URemote’Alert Provides Auto-remote Protection Status Alert*
  • ULED Self-test Protection Status Monitors for each phase
  • UFeatures Fiberglass NEMA Type 4X Rated Enclosures
  • UManufacturers 10 Year Full Replacement User Warranty
  • USystem Designed to Protect Downline TVSS From Degradation
Features Spec-grade Power, and Robust Hi-Energy Single-Element (“SE”) TVSS Design
Maintains 335,000 Solid Amps of Ultra Safe, Non-Degrading Surge Capacity!
"Active Sinewave-tracking" and low-level spike/noise and EMI/RFI filtering network to protect the most complex computers and sensitive electronics and automation circuits
For Ultra-Pure System Automation and Complex Digital and Life-Support Systems
Safely protects sensitive electrical equipment and total system load capacities up to 250KW
Greatly increases ‘Mean Time Between Failures’ of Lighting, Electronic and Electrical Equipment


Model S-1120-3T S-1208-4T S-1240-4T S-1480-4T
AC Service Types 3Ø WYE 3Ø Hi-Leg 3Ø WYE
Nominal AC Line Voltage (VRMS) 120/240 120/208 120/208/240 277/480
Frequency Range - USA / Euro Std 50/60 Hz 50/60 Hz 50/60 Hz 50/60 Hz
Single Element SE* Protection Modes L-N; L-L L-N; L-L & N-G L-N; L-L & N-G L-N; L-L & N-G
Knock Out Size for Mounting 3/4" 3/4" 3/4" 3/4"
Leads: #12 AWG Stranded Copper 3+G 4+G 4+G, Hi-Leg 4+G
Max. SE* Per Mode Surge KVA 45 45 45 45
Max. Surge Current Per Phase KVA 90 135 135 135
Total Surge Capacity (KVA@ 8x20 μsec pulse) 154 335 335 335
Max. Continuous Operating Voltage (MCOV) 150/320 150/320 150/320/320 320/550
Max. Clamping Voltage - L-L 520 520 520 1175
Max. Clamping Voltage - L-N 390 390 390 675
Max. Clamping Voltage - N-G 390 390 390 390
Warranty 15 Years per Manufacturers Warranty Guidelines
Enclosure Dimensions (HxWxD) 8 1/4" X 6 1/4" X 4 1/4"
Enclosure Type NEMA/EEMAC Type 4X Water, Explosion/Spark Proof w/ Embeded PCB and Filter Pkg.
Certifications UL / CUL Std 1449, 3rd Edition and Full Line is ETL Certified, Safety Tested and Listed
Safety Testing UL & ANSI/IEEE C62.11,C62.41 & C62.45 Std. 587 and NEMA Std. LS-1
Protection Status Indicators Lifetime Green LED Self Test Indicators For Each Phase
Shipping Weight Lbs (Approx.) 7 7.5 7.5 7.5