FERRAZ ST4803PYM 277/480V 3-ph Wye
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Manufacturer Mersen
Mfg Catalog # ST4803PYM
North Coast Part # 818165


  • Easy installation or retrofit
  • DIN-rail mountable
  • Fail-safe, self-protected design
  • Remote indicator (optional)
  • Visual indicator
  • IP20 finger-safe design
  • Small footprint
  • No additional overcurrent protection devices required
  • 2-year warranty


  • ANSI/UL 1449 4th Edition, Type 1 Component Assembly SPD, File E210793
  • ANSI/IEEE C62.41.1, C62.41.2, C62.45
  • RoHS Compliant


  • Frequency Hz: 50/60 Hz
  • Max Operating Temp: 85 °C
  • Max Storage Temp: 85 °C
  • Min Operating Temp: -40 °C
  • Min Storage Temp: -40 °C
  • Short Circuit Current Rating Sccr: 200 (most models) kA
  • Torque Rating: 15 lb-in
  • Response Time: <25 ns
  • Mcov L-G: 470 V
  • Mcov L-L: 640 V
  • Mcov L-N: 320 V
  • Mcov N-G: 150 V
  • Nominal Operating Volt Rating Un: 480Y/277 V
  • Vpr L-G: 900 V
  • Vpr L-L: 1800 V
  • Vpr L-N: 900 V
  • Country Of Origin: MX
  • Product Line: Surge-Trap® Modular SPDs DIN Rail
  • Product Brand: Surge-Trap®
  • Wire Type: Solid / Stranded CU
  • Connection Terminal Material: Zinc-Plated Steel
  • Connection Terminal Type: Box
  • Installation Mounting: DIN Rail
  • Number Of Poles: 3-pole
  • Wiring Range: #6 to #14 AWG
  • Wire Connections: Box
  • Flammability Rating: UL94 V0
  • Ul Spd Type: Type 1 Component Assembly
  • Housing Material: PET (Polyethelene Terphthalate)
  • Ac Or Dc: AC
  • Max Discharge Current Imax 8 20: 50 kA per phase
  • Nominal Discharge Current: 20 kA
  • Number Of Wires: 5 Wire
  • Protection Modes: L-G, L-L, L-N, N-G
  • System Configuration: 3-Phase Wye


UPC 78200136154
Family Brand Name Mersen
Item Long Description Surge-Trap Modular Surge Protective Device (SPD) is a no-fuse, fail-safe surge suppressor featuring Mersens patented TPMOV technology inside. UL 1449 4th Edition approved, it is DIN-rail mountable featuring a fail-safe self-protected design, visual indicator, and a small footprint. A remote indicator option provides status to critical control circuitry. The Surge-Trap Modular SPD has a high short circuit rating and a thermally protected MOV, which eliminates the need for additional overcurrent protection devices.
GTiN 00782001361549
Length 3.58 in
Width 2.1 in
Type Surge-Trap SPD
Terminal Type Box
Applications AC/DC distribution Power supplies Industrial automation Telecommunications Motor controls and starter systems Programmable logic controller (PLC) applications Power transfer equipment HVAC applications AC drives UPS systems Security systems IT / Data centers Medical equipment
Mounting Type DIN Rail
Height 2.7 in
Weight 0.85 lb
Pkg Qty 1
Housing Material Polyethelene Terphthalate
TC Connection Box
Number of Poles 3 Pole
Number of Wires 5
Indicator Microswitch
Terminal Material Zinc-Plated Steel
Sub Brand Surge-Trap
Short Circuit Current Ratng 200000 A
Current Type AC
Max Discharge Current 50 kA
Nominal Discharge Current 20 kA
Voltage 255 VAC
Country of Origin Mexico
Frequency 50 Hz
Max Operating Temperature 85 C
Response Time <25 Nano-Seconds
Min Operating Temperature -40 C
Torque Rating 15 lb-in

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