Sourcing and lifecycle
The MR-J4-22KB: Lifecycle status is current — Mitsubishi lists this as an active catalog item. No phase-out notice, no last-time-buy window. That means the normal supply chain applies: quoted to order against an RFQ, with factory lead times typical for the MR-J4 family. For a line-down spare or a new machine build, this is the part to specify; no cross-reference or second-source search needed.