Schneider Electric Finder RHN 412 or RHK 412 PS-UNI relay for PPM ATT mobile crane









If you decide to buy equipment at a low price, make sure that you communicate with the real seller. Find out as much information about the owner of the equipment as possible. One way of cheating is to represent yourself as a real company. In case of suspicion, inform us about this for additional control, through the feedback form.
Before you decide to make a purchase, carefully review several sales offers to understand the average cost of your chosen equipment. If the price of the offer you like is much lower than similar offers, think about it. A significant price difference may indicate hidden defects or an attempt by the seller to commit fraudulent acts.
Do not buy products which price is too different from the average price for similar equipment.
Do not give consent to dubious pledges and prepaid goods. In case of doubt, do not be afraid to clarify details, ask for additional photographs and documents for equipment, check the authenticity of documents, ask questions.
The most common type of fraud. Unfair sellers may request a certain amount of advance payment to “book” your right to purchase equipment. Thus, fraudsters can collect a large amount and disappear, no longer get in touch.
- Transfer of prepayment to the card
- Do not make an advance payment without paperwork confirming the process of transferring money, if during the communication the seller is in doubt.
- Transfer to the “Trustee” account
- Such a request should be alarming, most likely you are communicating with a fraudster.
- Transfer to a company account with a similar name
- Be careful, fraudsters may disguise themselves as well-known companies, making minor changes to the name. Do not transfer funds if the company name is in doubt.
- Substitution of own details in the invoice of a real company
- Before making a transfer, make sure that the specified details are correct, and whether they relate to the specified company.

Some of the owners of older types of PPM truck cranes are familiar with this issue. A fault caused by a defective relay board fitted with either RHN 412 or RHK 412 relays. The problem might lie solely in the relay, but the printed circuit board or the relay socket could also be damaged. This fault is encountered by owners of PPM truck cranes manufactured in different periods and of various types
Every mechanic who discovers a fault in the given circuit knows that the RHN and RHK relays have not been produced since 2022, and global supplies are low. Moreover, the market is driving up prices. Buying a baseboard is also neither easy nor cheap, and the cost is quite high. Today, there are many cranes around us facing this problem. After extensive research, we have found a solution that is quick, high-quality, and reasonably priced.The PS-UNI relay board is our solution, and we have already used it on many truck cranes of various categories. It has helped us solve problems with the old design, and its use is straightforward. Anyone can see that this solution is easy.
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