Test box Combi 12V

Test box combi 12 V

Art.-no. 0555772123

Prices for customers after login

Test box Combi 12V

Art.-no. 0555772123

Prices for customers after login



x1 pcs
Show availability in Würth trade store

Exclusively for trade customers

Register now and access more than 125,000 products

Checking of trailer connectors and towing vehicle sockets

Overload protection

LED in centre of test box indicates whether test can be performed or whether there is an overload

Operating voltage

12 volt DC / 3 volt DC

Scope of delivery

  • Test box with 4.5 m cable and combi-connector

  • Short adapter for testing 7-pin trailer connectors

  • Lithium button cell 3V CR 2032

  • Supplied in practical storage case

Complies with ISO 1724, ISO 11446 and ISO 3732

Product information

Würth Catalogue(X)

Catalogue page as PDF 1  |  2

Flip catalog


Application area

Also suitable for vehicles with CAN bus

Testing of 7-pin and 13-pin sockets on the vehicle:

The test box simulates the trailer

Functional check:

LED (9(-) and 10(-)) must light up

The test box is fitted with a 4.5 m cable, which means that the test can be performed by one person

Testing of 7-pin and 13-pin connectors on the trailer:

The test box simulates the towing vehicle using battery operation (3V button cell)

When testing 7-pin connectors, the supplied adapter must be used

Cable length

4.5 m

Min. nominal voltage

3 V/DC

Max. nominal voltage

12 V/DC

Max. current

0.2 mA

Min. working temperature

5 °C

Max. working temperature

40 °C

Material of the housing




Test box Combi 12V including:

1 x
Button cell Lithium 3V


Description: Low level of self-discharge and long shelf life – of 10 years
Quantity: 1 x

Packaging unit

The packaging unit defines the number of articles in one packaging. In the catalog segment you can choose from different packaging units if a pop-up menu is displayed.

Just leave the field empty if you don't know the packaging unit when directly entering the article number in the shopping basket or when importing with Easy-/VarioScan. The packaging unit will be determined automatically.

Structure of our article number

The article number is made up of the following: VVVVAAABBB
VVVV = 4 digits for prefix number (please note that the first digit is currently always 0)
AAA = 3 digits for dimension part 1
BBB = 3 digits for dimension part 2

Example article number structures:
Example 1: Screw with dimensions of 4x10 mm:
00574 10 (2 spaces between the 4 and the 10)

Example 2: Screw with dimensions of 10x20 mm:
005710 20 (1 space between the 10 and the 20)

Example 3: Flat washer with an internal diameter of 6 mm:

Information on price and image display

Price per packaging unit (PU):
The displayed price is always in line with the displayed packaging, if the PU is 250 the price for 250 units, if the PU is 300 the price for 300 units.

Price with price key representation (PSL):
The price always applies to a quantity ruled through the price key:
Price for 1 unit
Price for 100 units
Price for 1000 units


The quantity shows the number of pieces or units of measure contained in the order or delivery for the respective article.

Hazardous Material

Product information

Würth Catalogue

Catalogue page as PDF  | 

Flip catalog


Datasheets ()

CAD Data  | 




Technical information