Latching PTSM Connectors Phoenix Contact Latching PTSM Connectors are compatible with existing PTSM headers. The expansion of the PTSM series now makes multiple connections options possible: wire-to-board, board-to-board, wire-to-wire, and through-board. The PTSM secure latching mechanism can be easily locked and unlocked without the use of any tools and is the ideal choice for LED lighting and other space critical applications.