Paperless Datasheet
Going green and protecting environment is manufacturers' responsibility. Each WatchfulEyE product has a link of downloading data sheet on its enclosure:

3D file download

Model & Ordering Code

Model Ordering Code Un Uc Up
WTH-10/DC24 US120383 24VDC 36VDC 0.5kV
WTH-10/DC48 US120384 48VDC 60VDC 0.6kV

Certificates of Products - Page 01 - Back to TOP -

1. One-piece compact modular design with minimized volume, 35mm standard DIN-rail installation, easy to be integrated into a power distribution cabinet
2. The LED indicator indicates the working status of surge protection. When the indicator is off, it prompts to replace it timely to prevent the system from being damaged by the secondary surge
3. The product integrates high-quality MOV chip, its response speed is as fast as 5ns
4. In accordance with: IEC 61643-11 - Class III and UL1449 Type 4 Location
5. Location of use: DC load centers
WTH-10/DC Series Technical Data
Nominal Discharge Current (In) 5kA
Max. Discharge Current (Imax) 10kA
Open circuit voltage (Uoc) 15kV
Max Line Current 10A
Protection Modes +/-, +/PE, -/PE
Protective Element MOV + GDT
Response Time (tA) <5ns
Leakage Current (DC+/DC- to PE) NO
Thermal Protection YES
Protection Rating (IP Code) IP 20
Surge Life at 3kA (8/20μs) >1000 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 6mm² (stranded)
Stripping Length Contacts 0.5inches (13mm)
Terminal Screw Torque Max. 1.0Nm
DIN Rail EN60715 35mm top-hat rail
Dimensions DIN 43880 27mm (1.5TE)
Housing Material Thermoplastic (UL94 V-0)
Housing Design Compact design - Page 02 - Back to TOP -

DC power system parallel connection and series connection diagram
1. When connecting in parallel, only the upper position (A) needs to be connected, and the lower position (B) does not need to be connected.
2. When connecting in series, the upper position (A) and the lower position (B) must be connected at the same time, and make sure the maximum load current must be less than 10A (C).

Dimensions - Page 03 - 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. - Page 04 - 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 - Page 05 - Back to TOP -

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

I have a question - Page 06 - Back to TOP -