The Heidelberg Catechism on Question 37 says:
37. Q. What do you confess when you say that He suffered?
A. During all the time He lived on earth, but especially at the end, Christ bore in body and soul the wrath of God against the sin of the whole human race. Thus, by His suffering, as the only atoning sacrifice, He has redeemed our body and soul from everlasting damnation, and obtained for us the grace of God, righteousness, and eternal life.
Question: “If Christ made a satisfaction for all, then all ought to be saved. But all are not saved. Therefore he did not make a perfect satisfaction.”Answer: "Christ satisfied for all, as it respects the sufficiency of the satisfaction which he hath made, but not as it respects the application thereof.” (HC commentary, p. 215.)
Here are a few more quotes from Ursinus:
"God willeth that all be saved, as he is delighted with the salvation of all...[and] inasmuch as he inviteth all to repentance: but he will not have all saved, in respect of the force and efficacy of calling." Ursinus, The Summe, p. 353. Quoted in G. Michael Thomas, The Extent of the Atonement (Paternoster, 1997), p. 110.
"He satisfied for all regarding satisfaction, but not with respect to application." The Summe, pp. 131-132. Quoted in Thomas' The Extent of the Atonement, p. 111.
"The cause why all are not saved by Christ, is not the insufficiency of the merit and grace of Christ (for Christ is the full propitiatory sacrifice for the sinnes of the whole world, as concerning the worth and sufficiency of the ransome and price which he paid) but it is the infidelity of men, whereby they refuse the benefits of Christ offered in the Gospel..." Quoted in Thomas' The Extent of the Atonement, p. 111.
"Christ was ordained by God the Father...to offer himself a sacrifice propitiatory for the sins of all mankinde...and lastly to apply effectually his sacrifice unto us...by enlightening and moving the elect." The Summe, pp. 116-117. Quoted in Thomas' The Extent of the Atonement, p. 111.
Thomas comments on Ursinus:
"Ursinus' double-sided doctrine of the extent of the atonement resembles Bullinger's position, as does his use of the conditional covenant theme. It also bears a strong resemblance to that of the Bernese theologian Wolfgang Musculus (1497-1563)." Thomas' The Extent of the Atonement, p. 112.