Solenoid Relay
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WINCH MOTOR REVERSING SOLENOID CONTACTOR RELAY 6 Term List Price: $49.50 Sale Price: $21.49  |
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BRAND NEW HEAVY DUTY 12 VOLT Reversing Polarity Contactor for Permanent Magnet Winch and Reversable Motors This solenoid switch is used to reverse polarity on permanent Magnet winch motors with 2 terminal posts... |
Solenoid Relay
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 Nikko Denki Solenoid Control Relay OE 24 Volt US $179.00 |
 4 NEW WINCH SOLENOID RELAY FOR WARN 12 VOLT HEAVY DUTY US $114.00 |
 4 WINCH SOLENOID RELAY SWITCH FOR WARN 12 VOLT MOTOR US $114.00 |
 NOS 1980 90s Delco EGR Control Valve Relay Solenoid US $112.50 |
 1986 91 c4 corvette egr control valve relay solenoid US $99.99 |
 Superwinch Roggle Solenoid relay for handle bar switch US $90.00 |
 Mopar NOS O Drive K Down Solenoid Relay 39 41 PDDSC US $69.50 |
 Cummins P7100 Fuel solenoid wire harness with relay US $69.00 |
 12V SOLENOID RELAY FOR VALEO STARTERS TM000A22501 US $62.95 |
 Ford diesel glow plug relay Manual controller solenoid US $61.95 |
 2 NEW WINCH SOLENOID RELAY FOR WARN 12 VOLT HEAVY DUTY US $59.99 |
 2 WINCH SOLENOID RELAY SWITCH FOR WARN 12 VOLT MOTOR US $59.99 |
 BMW E34 M50 Starter Motor Solenoid Relay E36 325i 525 US $50.00 |
 BMW E36 Starter Motor Solenoid Relay E46 E39 325 318 US $50.00 |
 jaguar 1994 xj6 40 door lock starter solenoid relay US $49.99 |
 5 Continuous Duty Solenoids 80 Amp Relay Switch 12V US $49.50 |
 FORD DIESEL GLOW PLUG Relay SOLENOID 69 73 TURBONON US $45.00 |
 NEW 4 X FORD DIESEL GLOW PLUG Relay SOLENOID 69 73 US $45.00 |
 NEW FORD 1956 1978 STARTER SOLENOID RELAY NEW OEM US $43.89 |
 FORD MUSTANG 1963 1978 STARTER SOLENOID RELAY OEM NEW US $43.89 |
 Ford Truck 1956 1978 STARTER SOLENOID RELAY F150 F250 US $43.89 |
 Ford Truck 56 78 STARTER SOLENOID RELAY F150 F250 OEM US $43.89 |
 FORD CARS 1956 1978 STARTER SOLENOID RELAY NEW OEM US $43.89 |
 FORD MUSTANG 1963 1978 STARTER SOLENOID RELAY NEW OEM US $43.89 |
 FORD 1956 1978 STARTER SOLENOID RELAY NEW OEM US $43.89 |
 JAGUAR RELAY MODULE SEAT HEATERS GEAR SHIFT SOLENOID US $40.00 |
 4 X Starter Solenoid Relay Switch Ford Bronco Mercury US $40.00 |
 85 93 FORD MUSTANG LX COBRA STARTER SOLENOID RELAY OEM US $39.95 |
 85 89 F150 F250 F350 FORD TRUCK STARTER SOLENOID RELAY US $39.95 |
 85 96 FORD BRONCO STARTER SOLENOID RELAY NEW OEM US $39.95 |
 99 07 F150 250 FORD DIESEL TRUCK STARTER SOLENOID RELAY US $39.95 |
 85 93 FORD MUSTANG GT LX COBRA STARTER SOLENOID RELAY US $38.95 |
 OEM 12 VOLT AUTOCRANE BOOM WINCH SOLENOID RELAY SWITCH US $37.25 |
 12 VOLT CLUB CAR GOLF CART SOLENOID RELAY SWITCH US $37.25 |
 Solenoid control relay IMS 12021 US $37.03 |
 85 96 FORD BRONCO STARTER SOLENOID RELAY NEW OEM US $33.89 |
 2 x FORD DIESEL GLOW PLUG Relay SOLENOID TURBONON US $30.00 |
 NEW 2 x FORD DIESEL GLOW PLUG Relay SOLENOID TURBONON US $30.00 |
 1 WINCH SOLENOID RELAY SWITCH FOR WARN 12 VOLT MOTOR US $30.00 |
 1 NEW WINCH SOLENOID RELAY FOR WARN 12 VOLT HEAVY DUTY US $30.00 |
 36 volt Golf Cart Solenoid Relay NEW 586 117111 US $30.00 |
 SOLENOID STARTER 05 Saturn Relay 35L US $30.00 |
 Starter Solenoid Relay Yamaha FJR13 FJR1300 NEW FJR 13 US $29.00 |
 Starter Solenoid Relay Yamaha FZS1000 FZ1 FZ1S FZS NEW US $29.00 |
 Starter Solenoid Relay Yamaha XV17 ROADSTAR WARRIOR NEW US $29.00 |
 Starter Solenoid Relay Yamaha XV1700 ROAD STAR WARRIOR US $29.00 |
 Starter Solenoid Relay Yamaha YZF R1 YZF R6 CHAMPION US $29.00 |
 Starter Solenoid Relay Yamaha YZF R1 YZFR1 NEW 99 00 US $29.00 |
 Starter Solenoid Relay Yamaha YZF1000 YZF 1000 NEW US $29.00 |
 Starter Solenoid Relay Yamaha YZF600 YZF R6 YFZR6 YZFR6 US $29.00 |
 Starter Solenoid Relay Honda 200 TRX200 NEW 1990 1997 US $29.00 |
 Starter Solenoid Relay Honda 90 200 350 400 450 500 NEW US $29.00 |
 Starter Solenoid Relay Honda 90 TRX90 2006 2009 NEW US $29.00 |
 Starter Solenoid Relay Honda ATV 350 400 450 500 NEW US $29.00 |
 Starter Solenoid Relay Kawasaki ATV BAYOU 220 250 NEW US $28.95 |
 Starter Solenoid Relay Kawasaki BAYOU 220 KLF220 NEW US $28.95 |
Solid State Triac Devices Replace Mechanical Relays in Power Switching Applications
What must be further understood is that mechanical relays, contactors, and switches operate in a random manner with respect to the electrical signal to be switched. Imagine a 60Hz AC power circuit. A mechanical relay, contactor or switch will interrupt this circuit in a random manner with respect to the AC power waveform passing through it. If the circuit is interrupted at a moment when the AC current flow is low, then little reverse voltage will result. If however, the circuit is interrupted at an instant when the AC current flow is high, then a corresponding high reverse voltage will result.
What meaning does this have for the electronic product design engineer? Mechanical circuits are, in fact, circuits that interrupt the flow of electricity in a ‘random’ manner - random, of course, with respect to the AC current flowing through that circuit at any particular instant. In a circuit that exhibits high inductance, such as a motor circuit, a solenoid circuit, or an electromagnetic circuit; reverse voltage can get very high. High voltages can damage and pit mechanical contacts. High voltages can cause noise and disturbance to other nearby sensitive circuitry.
Energy is stored in the electro-magnetic field that surrounds an inductive circuit. The stored energy is high when the corresponding current flow in that circuit is high. Upon circuit interruption, the flow of current through the circuit immediately stops. As current flow stops, the circuit’s electro-magnetic field collapses sending its unit of stored energy back into the wires from which it came. If the current is high, and the field is large, then a high voltage will be created. Mechanical relays, contactors and switches all will exhibit this type of behavior.
Solid-state triac devices may be used to interrupt the flow of electricity in a manner that is synchronous with the AC current waveform. Triacs are three-terminal, solid-state semiconductor devices which permit the flow of AC current through two terminals so long as the third, the trigger, is energized. Triacs have the additional, highly desirable property that electrical current flow stops when current flowing through the device is zero. This may seem obvious, but imagine the following: AC Current is flowing through your inductive circuit. You now wish to turn that circuit off. You do so by removing the trigger signal from your solid state triac device. The device continues to conduct electricity until the AC current waveform reaches zero, at which time no further AC current flows until the device is triggered again. The action of the solid state triac device ensures that the circuit is broken only when zero current is actually flowing.
Return to our inductive circuit. The solid state triac device ensures that the circuit’s energy flow is interrupted only when the AC current waveform reaches its instantaneous zero. The stored energy in the circuit’s electro-magnetic field will be at or near zero when the current flowing through that circuit is at or near zero. With no field energy, there will be nothing to cause the high voltages we previously observed in mechanical switching systems. The solid state triac device guarantees that circuit interruption will occur only at the zero-current instants thereby eliminating the worry of high voltage switching transients.
We at Orchid Technologies Engineering and Consulting, Inc. have successfully designed numerous custom high energy power switching circuits. These circuits are required to operate at high duty cycles and in close proximity to sensitive digital and analog circuitry. We have found that when designing with TRIAC and SCR devices we can eliminate most if not all switched circuit noise. Today’s solid state TRIAC devices are truly amazing. High current capacity at high switched voltages with very low leakage can be purchased in small packages at reasonable cost. Visit www.orchid-tech.com to learn more, or call Paul Nickelsberg, President and CTO of Orchid at 978-461-2000 for more information.
About the Author
What is the smallest 12-V battery that could be used, for example to verify auto parts work at a salvage yard?
. . . rechargeable or non-rechargeable, assuming that only a minimal amount of current would be needed to test the parts (relays, solenoids, sensors, etc.).
Hobbico TorqMaster Mini 12V 4.5A Battery. It might not be the smallest, but it will work. It's $51.00