WTH-20/D/R/1P Series
www.watchfuleyesolutions.com Surge Protective Device for AC Power Supply System

Paperless Datasheet
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In accordance with: IEC 61643-1 - Class III and UL1449 Type 4 Location
Location of use: branch sub-distribution boards
Plug-in module and separate base design enables convenient maintenance.

WTH-20/D/R/1P Series
Model Ordering code
WTH-20/D/R/1P-885 US120452
WTH-20/D/R/1P-885 x2pcs US120452x2
WTH-20/D/R/1P-885 x3pcs US120452x3
WTH-20/D/R/1P-885 x4pcs US120452x4

Technical Data
Model WTH-20/D/R/1P-885
Requirement Class to IEC61643-1 Class III
IEEE Category Rating B & A
Max. continuous operating voltage (Uc) 885VAC 50/60Hz
Voltage protection level (Up) 2.7kV
Residual voltage (Ures @6kV/3kA) 2.2kV
Nominal Discharge Current (In) 10kA
Max. Discharge Current (Imax) 20kA
Open circuit voltage (Uoc) 20kV
Protection Modes L-PE, N-PE
Protective Element MOV
Follow Current (If) NO
Response Time (tA) <5ns
Leakage Current (at 75%U1mA) <20μA
Thermal Protection YES
Protection Rating (IP Code) IP 20
Short Circuit Current Ratings (SCCR) 25kA rms
Max. Back-up Fuse (if mains >50A) 50A gL (circuit-breaker: <20A)
Surge Life at 3kA (8/20μs) >5000 events
Temperature Range - 40°F to 176°F (-40°C to 80°C)
Relative Humidity 0% to 95% noncondensing
Maximum Operating Altitude 10,000 feet (3000m)
Terminal Cross Section 35mm² (solid) / 25mm² (stranded)
Stripping Length Contacts 0.6inches (15mm)
Terminal Screw Torque Max. 3.5Nm
DIN Rail EN60715 35mm top-hat rail
Dimensions DIN 43880 17.8mm (1TE)
Housing Material Thermoplastic (UL94 V-0)
Housing Design Modular design
Net Weight Per Unit 0.3Lb (136g)
Package Dimension (W×H×D) 0.7"×3.9"×2.7" (17.8mm×99mm×69mm)
Remote Contacts YES
Contact Ratings 125VAC/3A, 250VAC/1.5A
Terminal Cross Section Max. 1.5mm²
Stripping Length Contacts 0.25inches (6-7mm)
Remote Terminal Torque 0.25Nm

Connection Diagram
Fault Indication
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