Vibration, shock, thermo shock, moisture and salt spray resistant.Temperature ratings range from -40☌ to 85☌. These switches are vibration, shock, thermo shock, moisture and salt spray resistant. The Contura switches, with sealed option for front panel components of the switch only, are certified to IP66 and IP68, signifying complete protection against dust and prolonged spray and submersion under pressure, and are recognized to UL1500 - Ignition Protection for Marine Products. An optional plug-in terminal connector enables pre-wiring of wire harness. Actuators may be purchased and stocked separately. These single or double pole switches feature removable actuators in a choice of actuator styles and colours, and can be illuminated with either square or bar shaped lenses. The Contura III snap-in rocker switches offer countless unique options including choices for ratings, circuits, colours, illuminations and symbols. Contura Switches Blue Sea Contura Switches A push-to-break momentary switch has to be pressed however, to disconnect the connected electrical circuit and released to then reconnect it. When the button is released, the contacts will be released. When the “push-to-make” type of momentary switch is pressed, it will connect the metal contacts of the switch when pressed. The primary way that they differ from a traditional switch however, is that the momentary switch normally requires a button to be pressed to change the state of the switch vice the flicking action required of a traditional light or equivalent switch. ( ) = Momentary - Momentary switches are designed to act in the manner of a regular switch in order to help connect two metal contacts with the goal of completing an electrical circuit. The cross-over switches have only four terminals or connections, as opposed to six that you see on DPDT. That is why some variations of the DPDT switch, such as the cross-over switches, are internally wired for that purpose. DPST's should have four terminals.ĭPDT - Double Pole Double Throw - Double Pole Double Throw switches commonly use polarity reversal. Basically two SPST switches, which can control two separate circuits, but are always switched together by a single actuator. (Side note: in a pinch an SPDT can actually be made into an SPST by just leaving one of the switch throws unconnected).ĭPST - Double Pole Single Throw - Adding another pole to the SPST creates a double-pole, single-throw (DPST) switch. SPDT switches should usually have three terminals. Most simple slide switches are of the SPDT variety. SPDT's are great for selecting between two power sources, swapping inputs, or whatever it is you do with two circuits trying to go one place. SPDT's have three terminals: one common pin and two pins which vie for connection to the common. SPDT - Single Pole Double Throw - Another common switch-type is the SPDT. SPST switches should only require two terminals. They’re also a very common form of momentary switches. The switch will either be closed or completely disconnected. SPST - Single Pole Single Throw - A single-pole, single-throw (SPST) switch is as simple as it gets. A double-throw switch has a contact that can be connected to either of two other contacts, a triple-throw has a contact which can be connected to one of three other contacts, etc Switch Types: A single-throw switch has one pair of contacts that can either be closed or open. The number of "throws" is the number of separate wiring path choices other than "open" that the switch can adopt for each pole. For example, a "2-pole" switch has two separate identical sets of contacts controlled by the same switch. The number of "poles" is the number of separate circuits which are controlled by a single switch. The terms pole and throw are also used to describe switch contact variations. In some switch designs, engineers may use a minimum wetting current in order to help prevent insulating oxides from forming. Other qualities considered for contact materials in switches include cost, low toxicity, hardness, mechanical strength, and electrical conductivity. This is due to the fact of most metals forming an insulating oxide that prevents a switch from operating properly. Engineers will normally choose the contact material for the circuit for its ability to resist corrosion. These contacts are commonly made up of metal and they are normally required to touch to complete the circuit and to separate to open the circuit. The most basic switch has two contacts or conductive pieces that are connected to an external circuit.
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