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/US120335.html

3D file download

http://www.watchfuleyesolutions.com/wth_rar/3D/WTH-40_1P.STEP.zip
http://www.watchfuleyesolutions.com/wth_rar/3D/WTH-40_2P.STEP.zip
http://www.watchfuleyesolutions.com/wth_rar/3D/WTH-40C3P-PV.stp.zip

Model & Ordering Code (3P Mode)

Certificates of Products

Model & Ordering Code (1P/2P Mode)

Description

In accordance with: IEC/EN61643-11 - Class II and UL1449 Type 4 Location
BatteryManagement System, Suitable for off-grid PV system or grid-connected system
Location of use: BatteryManagement System, DC System, DCpv System, Photovoltaic Combiner Box, Photovoltaic Power Supply Box
Plug-in module and separate base design enables convenient maintenance.
Internal thermal disconnect devices help ensure safe or at end-of-life

WTH-40/C DC & PV Series Technical Data
Requirement Class to IEC/EN61643-11	Class II
IEEE Category Rating	B & A
Nominal Discharge Current (In)	20kA
Max. Discharge Current (Imax)	40kA
Protection Modes	DC+/PE, DC-/PE, DC+/DC-
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 >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
Housing Material	Thermoplastic (UL94 V-0)
Housing Design	Modular design

Surge Protection Connection Diagram

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

Remote Contacts (Dry Contacts)

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

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1P mode

Single modules can be combined with a bus bar in multiple combination methods.

Three features of 3P mode strengthening protection

A: The isolated barrier between two modules
B: 3mm-wide gap between two modules
1. Increase creepage distance
2. Increase the capacity of insulation isolation and make the connection more secure
3. More important for the application with MCOV (Uc) higher than 800Vdc


C: Two MOVs are connected in series between each line to make the conduction voltage of common mode and differential mode surge protection achieve the best balance, and the Up value between all lines is kept on a horizontal level.

Dimensions

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

2P Mode Connection Diagram

3P Mode Difference mode & Common mode Connection Diagram

Common mode:DC+ to PE, DC- to PE surge protection
Difference mode:DC+ to DC- surge protection

Selection of back-up fuse

Selection of back-up circuit-breaker

Application

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?
DC System, DCpv System, Photovoltaic Combiner Box, Photovoltaic Power Supply Box

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