The 1-640456-9 is a 19-position, single-row, through-hole header from the MTA-100 series.
Current Rating Depends on Wire Gauge
For a given wire size, the per-contact current is derated from the terminal's rating, not the header's. In practice, the creepage distance on a 0.100" pitch single-row header limits the voltage in high-humidity environments, but 250VAC is safe for line-to-neutral mains in dry indoor equipment.
Mates with MTA-100 Receptacle, Friction Lock Engages
This header mates with the MTA-100 receptacle housing (e.g., 640456-2 series) that accepts 22-26 AWG discrete wire or 0.100" ribbon cable. The friction lock on the header engages a ramp on the receptacle — when mated, the pair resists casual disconnection but can be unmated without tools.