The 390088-2: In a test fixture or field-configurable jumper that is cycled weekly, that is roughly a decade of service at the contact interface before the gold wears through to the base metal.
Housing and Flammability Rating
Black polyester, glass-filled housing rated UL94 V-0.
Voltage and Current Context
Rated 250VAC — the limiting factor is the creepage distance across the open top, not the contact itself. For signal-level jumpers (5V, 3.3V logic or configuration straps), the voltage margin is generous. The dual-beam contact design provides redundant wiping action on each pin.