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SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...
The 4 × 400 metres relay or long relay is an athletics track event in which teams consist of four runners who each complete 400 metres or one lap, totaling 1600 ...
The 4 × 400 metres relay at the Summer Olympics is the longest track relay event held at the multi-sport event. The men's relay has been present on the Olympic athletics programme since 1912 and the women's event has been continuously held since the 1972 Olympics. The inaugural mixed 4 × 400 metres relay was held at the 2020 Olympics. It is ...
In athletics, the two standard relays are the 4 × 100 metres relay and the 4 × 400 metres relay. 4 × 200, 4 × 800, and 4 × 1500 m relays exist as well, but they are rarer. Mixed-gendered 4 × 400 metres relays were introduced at the 2017 IAAF World Relays , repeated at the 2018 Asian Games , the 2019 World Championships in Athletics and ...
The 4 × 400 metres relay at the World Championships in Athletics has been contested by both men and women since the inaugural edition in 1983. The competition features three formats in relation to gender: men, women, and mixed.
A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This switch has two pairs of "traveler" terminals that it connects either straight through, or crossed over (transposed, or ...
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