Wis. Stat. § 409.201: General effectiveness of security agreement.

(1) General effectiveness. Except as otherwise provided in chs. 401 to 411, a security agreement is effective according to its terms between the parties, against purchasers of the collateral, and against creditors.

(2) Applicable consumer laws and other law. A transaction subject to this chapter is subject to any applicable rule of law which establishes a different rule for consumers and to chs. 138, 421 to 427, and 429 and s. 182.025.

(3) Other applicable law controls. In case of conflict between this chapter and a rule of law, statute, or rule described in sub. (2), the rule of law, statute, or rule controls. Failure to comply with a statute or rule described in sub. (2) has only the effect the statute or rule specifies.

(4) Further deference to other applicable law. This chapter does not:

(a) Validate any rate, charge, agreement, or practice that violates a rule of law, statute, or rule described in sub. (2); or

(b) Extend the application of the rule of law, statute, or rule to a transaction not otherwise subject to the rule of law, statute, or rule.