WTH-20/D/R/1P SeriesWTH-20/D/R/3P+NPE SeriesWTH-20/D/R/4P Series  

Paperless Datasheet
Going green and protecting environment is manufacturers' responsibility. Each WatchfulEyE product has a link of downloading data sheet on its enclosure:
http://datasheet.watchfuleyesolutions.com/US120166.html

Model & Ordering Code

Model Ordering Code MCOV/Uc Remote Contacts UPC/EAN Code
WTH-20/D/R/3P+NPE-275 US120174 275VAC YES -
WTH-20/D/3P+NPE-275 US120164 NO -
WTH-20/D/R/3P+NPE-320 US120175 320VAC YES -
WTH-20/D/3P+NPE-320 US120165 NO -
WTH-20/D/R/3P+NPE-385 US120176 385VAC YES -
WTH-20/D/3P+NPE-385 US120166 NO -
WTH-20/D/R/3P+NPE-420 US120177 420VAC YES -
WTH-20/D/3P+NPE-420 US120167 NO -

Certificates of Products


Note: L-N surge protection module UL listed only

www.watchfuleyesolutions.com - Page 01 - Back to TOP -

Description
In accordance with: IEC/EN61643-11 - Class III and UL1449 Type 4 Location
Location of use: branch sub-distribution boards
Plug-in module and separate base design enables convenient maintenance.
Internal thermal disconnect devices help ensure safe or at end-of-life
L-N Module Technical Data
Nominal Discharge Current (In) 10kA
Max. Discharge Current (Imax) 20kA
Open circuit voltage (Uoc) 20kV
Protection Modes L-N
Protective Element MOV
Follow Current (If) NO
Response Time (tA) <5ns
Leakage Current (at 75%U1mA) <20μA
Thermal Protection YES
Maximum Continuous Operating Voltage (MCOV/Uc) 275VAC 320VAC 385VAC 420VAC
Voltage Protection Level (Up @L-N) 1.3kV 1.4kV 1.5kV 1.7kV
Residual Voltage (Ures @L-N) 1.0kV 1.1kV 1.2kV 1.4kV


N-PE Module
WTH-65/G module integrates High-Energy GDT, no leakage current. It pairs WTH-40/C/R series surge protector, combined into N-PE protection mode, the two modules are the same in dimension and shape, and are connected with a dedicated bus-bar to achieve a perfect combination.
WTH-65/G Technical Data
Max. continuous operating voltage (Uc) 255V
Nominal Discharge Current (In) 25kA
Max. Discharge Current (Imax) 65kA
Pulsed Current (Iimp) 15kA
Voltage protection level (Up) 1.0kV
Protection Modes N-PE only
Protective Element High Energy GDT
Follow Current (If) 100A rms
Response Time (tA) <100ns

www.watchfuleyesolutions.com - Page 02 - Back to TOP -

More Technical Data
Requirement Class to IEC/EN61643-11 Class III
IEEE Category Rating B & A
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 72mm (4TE)
Housing Material Thermoplastic (UL94 V-0)
Housing Design Modular design
Net Weight Per Unit 1Lb (450g)

www.watchfuleyesolutions.com - Page 03 - Back to TOP -
.

Surge Protection Connection Diagram


Dimensions


www.watchfuleyesolutions.com - Page 04 - Back to TOP -
.

Remote Contacts (Dry Contacts)
1: COM (Common)
2: NC (Normally Close)
3: NO (Normally Open)


Contact Ratings 125VAC/3A, 250VAC/1.5A
Terminal Cross Section Max. 1.5mm²
Stripping Length Contacts 0.25 inches (6-7mm)
Remote Terminal Torque 0.25Nm


Fault Indication (same indication in 1P/2P/3P/4P/1P+NPE/3P+NPE models)


www.watchfuleyesolutions.com - Page 05 - Back to TOP -

Common Terms and Definitions
1. Normal operating voltage rating (Un)
2. Maximum Continuous Operating Voltage (Uc/MCOV):
Maximum r.m.s. voltage, which may be continuously applied to the surge protective device's mode of protection.
3. Nominal Discharge Current for Class II Test (In):
crest value of the current through the surge protective device having a current waveshape of 8/20μs.
4. Maximum Discharge Current (Imax):
Crest value of a current through the surge protective device having an 8/20μs waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.
5. Voltage Protection Level (Up):
Maximum voltage to be expected at the surge protective device terminals due to an impulse stress with defined voltage steepness and an impulse stress with a discharge current with given amplitude and waveshape.
6. Residual Voltage (Ures):
Crest value of voltage that appears between the terminals of an surge protective device due to the passage of discharge current.
7. IEEE 62.41
CATEGORY C: outdoor overhead lines, service entrance (most severe)
CATEGORY B: major feeder, short branch circuits, service panel (indoor)
CATEGORY A: long branch circuits, receptacles (indoor) (least severe)

How to choose a suitable Uc(MCOV) value
Note: Uc >1.15Un
The relationship between two parameters Uc and Up of a surge protective device is proportional.
If Uc is small, the value of Up is also small; surge protective devices with smaller Up can provide better surge protection.
Whether to choose smaller Uc depends on the voltage stability of the grid.
If you choose surge protective devices with smaller Uc for the grid with instable voltage, the surge protective devices will frequently work while the grid voltage fluctuates, resulting in shortening surge protective device's product life.
If you choose larger Uc, and the value of Up is accordingly large, the surge protective efficiency will not be so fine.
If you are unsure of the voltage stability of the grid,
it is suggested to calculate MCOV(Uc) using the following formula: √ 2  Un < Uc < √ 3 Un

AC Network (Un) MCOV(Uc), L/N-PE Protection Mode
110V, 120/208V, 127/220V 150V
220/380V 275V, 320V, 385V
230/400V 275V, 320V, 385V, 420V
240/415V 320V, 385V, 420V
266/460V, 277/480V 385V, 420V
347/600V 550V, 690V
Wind Power System 690V (Grid side ), 885V (Gen side )

www.watchfuleyesolutions.com - Page 06 - Back to TOP -
.

AC Network Connection Diagram (1/2)





www.watchfuleyesolutions.com - Page 07 - Back to TOP -
.

AC Network Connection Diagram (2/2)


www.watchfuleyesolutions.com - Page 08 - Back to TOP -
.

Selection of back-up fuse

Selection of back-up circuit-breaker

www.watchfuleyesolutions.com - Page 09 - Back to TOP -
.

Application


Key
1. Origin of the installation
2. Distribution board
3. Distribution outlet
4. Main earthing terminal or bar
5. Surge protective device, class I or II tested
6. Earthing connection (earthing conductor) of the surge protective device
7. Fixed equipment to be protected
8. Surge protective device, class II tested
9. Surge protective device, class II or class III tested
10. Decoupling element or line length
F1, F2, F3 overcurrent protective disconnectors
NOTE Refer to IEC 61643-12 for further information.

www.watchfuleyesolutions.com - Page 10 - Back to TOP -

FAQ & Help
1. What should I do if I can't find the paper manual in the product packaging?
Watchful Eye products is committed to going green with paperless data sheets. On the side of each product enclosure is an engraved link with URL for downloading paperless data sheet and QR code of the website. If you need the paper data sheet, you can open the link and print the data sheet by yourself.

2. The advantages of fault indication windows?
If surge protection fails, the fault indication windows will turn red, thus it can be seen intuitively, and the surge protective device can be replaced in time to avoid damage to the equipment caused by a second surge.

3. What instruments can be used to test whether its surge protection function is normal or not?
Test with a Watchful Eye surge protector tester

4. Can you list more applications?
Power supply panel, whole house


www.watchfuleyesolutions.com - Page 11 - Back to TOP -

Download WatchfulEyE Official App
To learn about more products and updates from company, please scan QR code to download the official App:

After-sale Services
Watchful Eye provides a 5-year quality warranty globally.


I have a question

www.watchfuleyesolutions.com - Page 12 - Back to TOP -