WTH-40/C/2P 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 II and UL1449 Type 4 Location
Location of use: branch sub-distribution boards
Plug-in module and separate base design enables convenient maintenance.

Technical Data
Requirement Class to IEC61643-1 Class II
IEEE Category Rating B & A
Nominal Discharge Current (In) 20kA
Max. Discharge Current (Imax) 40kA
Pulsed Current (Iimp) N/A
Protection Modes L-PE, N-PE
Protective Element MOV
Follow Current (If) NO
Response Time (tA) <25ns
Leakage Current (at 75%U1mA) <20μA
Thermal Protection YES
Protection Rating (IP Code) IP 20
Short Circuit Current Ratings (SCCR) 20kA rms
Max. Back-up Fuse (if mains >80A) 80A gL (circuit-breaker: <40A)
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 36mm (2TE)
Housing Material Thermoplastic (UL94 V-0)
Housing Design Modular design
Net Weight Per Unit 0.48Lb (219g)
Package Dimension (W×H×D) 1.4"×3.6"×2.7" (36mm×90mm×69mm)
Remote Contacts NO
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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Ordering Information
Model Uc(AC/DC) Up Ures Ordering code
WTH-40/C/2P-75 75/100V 1.0kV 0.6kV US120001
WTH-40/C/2P-115 115/150V 1.2kV 0.7kV US120002
WTH-40/C/2P-150 150/200V 1.3kV 0.8kV US120003
WTH-40/C/2P-275 275/350V 1.5kV 1.0kV US120004
WTH-40/C/2P-320 320/400V 1.7kV 1.1kV US120005
WTH-40/C/2P-385 385/500V 1.8kV 1.2kV US120006
WTH-40/C/2P-420 420/600V 1.9kV 1.4kV US120007
WTH-40/C/2P-550 550/700V 2.4kV 1.8kV US120008
WTH-40/C/2P-690 690/800V 2.7kV 2.1kV US120009
WTH-40/C/2P-885 885/1000V 3.2kV 2.5kV US120463
※ Frequency: 50/60Hz (AC Power)
※ How to Name Models on UL Listing: http://datasheet.watchfuleyesolutions.com/UL.html

Common Terms and Definitions
Maximum Continuous Operating Voltage (Uc or MCOV):
Maximum r.m.s. voltage, which may be continuously applied to the SPD's mode of protection.

Nominal Discharge Current for Class II Test (In):
crest value of the current through the SPD having a current waveshape of 8/20.

Maximum Discharge Current (Imax):
Crest value of a current through the SPD having an 8/20 waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.

Voltage Protection Level (Up):
Maximum voltage to be expected at the SPD terminals due to an impulse stress with defined voltage steepness and an impulse stress with a discharge current with given amplitude and waveshape.

Residual Voltage (Ures):
Crest value of voltage that appears between the terminals of an SPD due to the passage of discharge current.


AC Network Connection Diagram (including some uncommon systems)