SNI1 means Selective Noise Isolator Type 1 in
Electronics
Similar to SNI1
4W - 4-Watt Resistor
4WA - Four Wire Analog
4WAI - 4-Wire Analog Interface
4WH - Four Watt-Hour capacity
4WJ - Four-Way Junction
4WM - Four Wave Mixing
A - form A
normally open contacts
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