KBK update for Tuesday, 27th August

It seems that the plunger colours for Micro Switch SW Series non-illuminated switches may finally be understood. The original plungers were grey (ca. 1968–1971) followed by black when the plungers were redesigned. Around the mid-70s, the momentary switches were then colour-coded by sensor type: red for sink level, blue for sink pulse, and seemingly green for source level. The last one based on the assumption that “C”-type SN switches are source level, thus green-plunger SW switches with the same sensor type (per the switch bills of materials) should also be source level.

The pale red switches sometimes seen are just red switches, which for some reason can either be a vivid red, or a soft red.

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