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Understanding
Relays |
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RELAY
VARIATIONS
Other relay variations include three and five pin relays. A 3-PIN relay
instead of two B+ input sources, this relay has one B+ input at pin
1. Current splits inside the relay, supplying power to both the control
and load circuits. A 5-PIN relay has a single control circuit, but two
separate current paths for the switch: One when the relay is de-energized
(OFF - no current through the control coil) and the other the energized
(ON - current is flowing through the control coil). When the 5-PIN relay
is de-energized (OFF), pins 4 and 5 have continuity. When the relay
is energized (ON), pins 3 and 5 have continuity.
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