What this header fits — pitch, positions, and mating half
The 1-770621-1 is a 12-position, 2-row header on 0.163" (4.14mm) pitch, with a matching row spacing of 0.163" (4.14mm). The mating half is a Mini-Universal MATE-N-LOK receptacle housing (sold separately). The 4-wall shrouding and locking ramp keep the pair aligned and latched under vibration — the ramp clicks in place and won't back out from cable tug.
Voltage, temperature, and material ratings that matter
That voltage ceiling suits industrial control panels and power distribution inside equipment enclosures. For a given wire size, check the derating curve in the Mini-Universal MATE-N-LOK application note.
Peer comparison — 1318699-3 vs 1-770621-1
The differences: 1318699-3 uses a 0.165" (4.20mm) pitch (vs 0.163"), a 4-row layout (vs 2-row), and a latch-lock fastening (vs locking ramp). For a 2-row board footprint with a locking ramp, the 1-770621-1 is the direct match.