M218 16-Channel Form A M-Module M219 4x4 Matrix M-Module M220 Dual 8x1 Multiplexer M-Module M221 8-Channel Form C M-Module M222 4-Channel Form C, Power M-Module M225 Quad 4x1 Multiplexer M-Module PX412S 4x4 Matrix PX413S Dual 8x1 Multiplexer VX412C C-1 32 SPDT Relay Switch Module VX414C C-1 16 SPST Relays (5A) plus 48 SPDT (2A) Multifunction Switching Module VX415C C-1 24, 4x1 Multiplexer Module VX416C C-1 96, 1x1 Discrete Switches HF4x8 Switching Module