![]() This saves a ton of copper wire as the control wire doesn’t carry high current and all the high current devices are in the close proximity to the relay. We can place the relays close to the appliance and send a tiny control signal wire from the car’s computer to the relay. There are several high current/power components in a typical car (or any automobile for that matter) such as headlights, heater/cooling system, blower, motors, audio system, etc. Relays are very useful in such scenarios as the microcontroller can provide the control signal to the relay’s coil and the contacts switch ON or OFF the appliance.Īnother major application of relays is in automobiles. This is exactly how we often use relays in real-life applications.Īssume there is a microcontroller which is configured to control an AC mains powered appliance. This construction is extremely useful if you want to control a large current switch with a tiny control signal from a microcontroller (or similar low voltage devices). The beauty of relays is that the parts that acts as switch in the relay (which consists of the actuator and the contacts) are isolated from the mechanism that activates or deactivates the switch (which is the coil and electromagnet). When we remove or disengage the control signal to the coil, it deactivates the electromagnet and the actuator return to its original position. This action will make the actuator to move from one position/contact (this is often called normally close or NC contact) to another position/contact (which is often called normally open or NO contact). When a small control signal flows through the coil of electromagnet, it attracts the actuator. In its basic form, a relay consists of an electromagnet and an actuator. The ‘mechanical’ action of moving the switch between ON and OFF positions is achieved by an ‘electrical’ signal. Unlike a traditional switch, which we flip or toggle to make it ON and OFF, a relay is an electromechanical switch. Maintaining contact causes the relay to heat up: the internal parts will melt together and eventually freeze the relay in its last position (whether on or off).As mentioned earlier, a relay is essentially a switch. This includes a temperamental switch that sometimes gets stuck, or from holding down a switch on a relay that is starting to fail. Relays typically only fail when contact is maintained on a switch. (Relays seldom fail after a short period because of a manufacturer defect they would simply not work at all upon installation.) Try to determine why the old relay failed to prevent damaging the new one, too. To avoid damaging a new relay, we recommend replacing any vintage switches connected to the relay including any switches at the light location as well as those in a master panel connected to the same relay. As long as the switches are all wired to the same relay, this will work as a 3-way, 4-way, etc., setup. Per the included wiring diagram from Pass & Seymour: the red from the relay goes to the ON side of the switch, the black wire goes to the OFF side of the switch and the blue wire (common) goes to the transformer.ģ-Way Switches: Wire switches in parallel to create a three way switch setup, (switches at either end of stairs, large rooms, halls, etc. Be sure to check your connections as there was no color standard, so it is possible your old wire colors are different. Wiring Tip: In general, to replace an older 3-wire relay, from the low voltage side of the relay connect the old red wire to the new red wire (ON), the old black or blue wire (OFF) to the new black wire and the old white (or other color) wire (COMMON) to the new blue wire. CSA and UL Listed for 120/277V also CSA listed for 347VAC.line voltage leads: #12-19 stranded copper wire type T-1/32 INS Black 6". ![]() low voltage leads: pre-stripped type SRIR #22 stranded tinned wire thermoplastic insulation 5.5" (140mm) long.split coil design energies ON coil to close line contacts and OFF coil to open contacts.3 low voltage leads - one red "ON", one black "OFF", one blue "COMMON".insert the mounting gasket into knock out opening before inserting relay.mounts in standard 1/2" KO through noise suppressing nylon ring.1.176" W x 3.156" H .818" diameter cylinder white plastic cap can be removed for installation.replaces Pass & Seymour/Sierra 1070A, 1070C, 72S relays.includes wiring diagram as connected to P&S low voltage switches.R eliable field-tested switching circuitry that provide central or local control of lighting loads. Pass & Seymour 1070B mechanical latching relay has three low voltage leads coming out of the top and two line voltage leads coming out of the bottom.
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