WTH-80/B+C/R Series
Paperless Datasheet	01
Model & Ordering Code	01
Certificates of Products	01
More Package	02
Technical Data	03
Surge Protection Connection Diagram	04
Dimensions	04
Remote Contacts (Dry Contacts)	05
Fault Indication	05
Common Terms and Definitions	06
How to choose a suitable Uc(MCOV) value	06
AC Network Connection Diagram	07
Difference mode & Common mode Connection Diagram	08
Selection of back-up fuse	09
Selection of back-up circuit-breaker	09
Application	10
N-PE Module	11
3P + NPE Combintion Package	11
1P + NPE Combintion Package	11
FAQ & Help	12
Download WatchfulEyE Official App	13
After-sale Services	13
I have a question	13

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/US120256x4.html

3D file download

Model & Ordering Code

Certificates of Products

More Package

Description

In accordance with: IEC/EN61643-11 - Class I+II and UL1449 Type 4 Location
Location of use: main sub-distribution boards, 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

WTH-80/B+C/R/1P Series Technical Data
Requirement Class to IEC/EN61643-11	Class I+II
IEEE Category Rating	C, B & A
Nominal Discharge Current (In)	40kA
Max. Discharge Current (Imax)	80kA
Pulsed Current (Iimp)	10kA
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 >100A)	100A gL (circuit-breaker: <50A)
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	0.5Lb (227g)

Surge Protection Connection Diagram

Indication of two levels of surge protection
The capability of displaying 50 percent of surge protection capacity: under normal circumstances, with two MOVs' protection at the same time, the module can realize Class I surge protection; in case that one of the indicator windows indicates red, there's still 50% of surge protection capacity to meet Class II surge protection requirements, and the module shall be replaced timely at this point.

Maximum Continuous Operating Voltage (MCOV/Uc)	275VAC	320VAC	385VAC	420VAC
Voltage Protection Level (Up)	1.8kV	2.0kV	2.1kV	2.2kV
Residual Voltage (Ures)	1.0kV	1.1kV	1.2kV	1.4kV

Dimensions

Remote Contacts (Dry Contacts)

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

Fault Indication

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 Connection Diagram (1/2)

AC Network Connection Diagram (2/2)

Difference mode & Common mode Connection Diagram

Common mode:L-PE, N-PE surge protection
Difference mode:L-N surge protection

Selection of back-up fuse

Selection of back-up circuit-breaker

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.

N-PE Module

WTH-100/G module integrates High-Energy GDT, no leakage current. It pairs WTH-80/B+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-100/G Technical Data
Max. continuous operating voltage (Uc)	255V
Nominal Discharge Current (In)	50kA
Max. Discharge Current (Imax)	100kA
Pulsed Current (Iimp)	37.5kA
Voltage protection level (Up)	1.2kV
Protection Modes	N-PE only
Protective Element	High Energy GDT
Follow Current (If)	100A rms
Response Time (tA)	<100ns
Net Weight Per Unit	0.4Lb (180g)

3P + NPE Combintion Package

1P + NPE Combintion Package

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

5. What is the feature of Class I+II?
It provides high capability of Class I surge protection, and capability of Class II (equivalent to the parameters of WTH-40 ) fine protection with low residual voltage as well, applying to Class I and Class II surge protection in multiple areas. If you are not sure which module to choose for protecting your area, Class I + II is the best solution.

6. What’s the difference between protection modes of 3+NPE and 4P?
According to the electrical diagram, 4P is common mode protection, the surge of each line will leak to the PE ground; 3P+NPE is differential mode protection, the surge of L-line is discharged to the N-line first, and then to PE ground.
The selection of 4P or 3P+NPE mode protection is based on the engineer’s preference.
Normally it's default that PE grounding is in good condition and either 4P or 3P+NPE can be used, and the better option is 4P.
If you can’t confirm whether the grounding is good or not, using 3P+NPE can protect against leakage to N. But in surge protection standards, poor PE grounding is not in compliance with the requirements.
You can choose MOV or GDT for N-PE as protection components. If GDT is used, there will be no leakage current on N-PE.

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After-sale Services

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