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2003 Cat.Pdf What’s New - New Products - What’s New High Voltage Reed Switches Tilt Switch See page 37 This series of switches is designed for Non-Mercury relays which are used in high reliability areas of the elec- trotechnical and electronic industry including electronic medical equip- Changeover ment; cable tester arrays and cable test equipment; copy machines; laser optical systems and infrared equipment; test equipment S1234 They provide high voltage stand-off and switching capability. The tung- See page 78 sten plated contacts give both a low stable CR and a long and reliable life. Surface Mount Mercury free changeover tilt switch with hermetically sealed gold contacts, Switch and and a case size of just 7.6mm. It’s rugged construction makes this Sensors switch suitable for many uses in secu- The Comus Group can now supply rity products, alarm and general move- surface mount termination for a wide ment sensing. rated at 60V, 0.2A and range of products. The gold plated clips See page 70 3VA Max. give good solderability and are designed to provide stability during assembly. Magtrix Connectors are versatile miniature Magtrix Neodymium-iron-boron nickel plated 6.0 Dia x Connector 5mm long magnets connected to a 40 x 0.65mm Dia. copper-tin plated flexible lead, with an operating MC/53GNS temperature of 120°C and a maximum power rating See page of 8 Amps. Primarily designed for use as battery connectors, 68 they are also ideal for proximity sensor and reed switch triggering, connecting PCBs, test equipment connections and prototypes where connections need to be made quickly. These connectors are ideal for use where space is at a premium or wherever magnetic muscle is required to replace traditional methods of connection, electrical or mechanical. Electronic Tilt Sensor Tilt Switch ETS 90XA Micro Miniature See page 80 Probably AU2100-0 the smallest See page 78 metal cased Tilt switch This electronic angle sensor is fully sealed into a in the world measuring just rugged ABS case which will meet the requirements 6.35mm. The hermetically sealed case and gold of IP65. The continuous linear voltage output over contacts with ratings of 0.15A 50V and 2VA Max., the full 90° Deg, range (zero +45° -45°) makes it allows this switch to be used in equipment where ideal for vehicle levelling and positioning medical and space is at a premium. Ideal for security engineering equipment. applications, hand held equipment etc. From initial design to full-scale manufacturing, the Comus group will be with you all the way SWITCHES + SENSORS A Comus International Group Company 1 Custom Product Contents All quantities Solid State Relays . 4 considered Solid State Relays - Heat Sinks . 21 We offer a full design and Output / Input Modules . 23 assembly service and can Reed Relays - DIL / SIL . 32 modify many of our products to your design requirements. Reed Relays - High Voltage . 37 This includes adding cable, Reed Switches . 42 connectors and terminals. Reed Switches - SMD / Moulded . 47 Switches can be encapsulated, Reed Switches - High Voltage . 49 assembled to PCB’s or fitted into housings. Proximity Switches . 53 Hall Effect Proximity Switches . 61 Magnets . 67 ● Contact Group Sales Office Surface Mount Sensors / Switches . 70 ● Your nearest agent Acceleration / Shock . 71 Potentiometers . 72 Movement and Vibration . 73 Tilt Switches . 77 Tip-Over switches . 90 Clips . 97 Float Switches . 98 High Power Switch Modules . 102 Silicone Rubber Keymats . 103 From initial design to full-scale manufacturing, the Comus Group will be with you all the way SWITCHES + SENSORS A Comus International Group Company 3 Solid State Relays Introduction CE-Mark Characteristics of Solid State Relays All chassis mounting SSR’s WG A5, WG 280, WG 480, WG 660, WG A3, WG A0 and WG F carry ● No mechanical parts the CE-mark and comply with the EU low voltage directive 73/23/EEC. Compliance with other ● Galvanic separation between control and load circuit by opto-coupler directives is not implied. The SSR’s are components which may only be incorporated into a ● Semiconductor components like triacs, thyristors, alternistors or MOS-FET’s in the output device which meets the requirements of relevant directives. Advantages of SSR’s against Electromechanical Relays Cooling ● Nearly unlimited life expectancy When the Solid State Relay is switched on there is a voltage drop at the output semiconductor. The load current multiplied by this voltage drop causes power dissipation and thus a thermal ● Low control power, direct interface to microcomputer or PLC rise in the SSR. Therefore it is necessary to use a heat sink to prevent damage to the SSR. A ● No contact bounce derating diagram for each SSR is given on the applicable data sheet. The following is an exam- ● No sparks ple of how to select a heat sink for a chassis mounted AC relay using these diagrams. The load ● No mechanical contact wear current is 9 A and the ambient temperature is 50 °C. ● Insensitivity to shock, vibration and mechanical forces as well as severe environmental conditions ● Gunther thyristor SSR’s are manufactured using DCB-technology (direct copper bonding) and are approximately 100 times more resistive to temperature cycles than conventional SSR’s Switching Types Gunther Solid State Relays are available in two different switching types: Zero Cross Switching (Z-type SSR’s) After switching on the control voltage the SSR switches through within the next zero crossing of the load voltage. This switching type is suitable for resistive, capacitive and slight inductive loads. a.) Draw a vertical line in the left diagram from the desired load current (9 A) up through Random Switching (R-type SSR’s) the curve. After switching on the control voltage the SSR switches through without any delay. b.) Where the vertical line intersects the curve, draw a horizontal line extending across both This switching type is suitable for inductive loads e.g. motors and magnet valves. diagrams. c.) The power dissipation is indicated at the left end of this lione, 9 Watts in this case. d.) Draw a vertical line in the right diagram from the specified ambient temperature (50 °C) Protection Circuits up through the horizontal line drawn in b. RC-Snubber e.) The intersection point indicates the minimum value of thermal resistance a heat sink must have to prevent damage to the SCR, 2.8 K/W in this case. A RC-snubber limits fast load voltage changes (e.g. caused by inductive loads) at the load ter- f.) The required heat sink must be rated at less than 2.8 K/W. Therefore select the Gunther minals. Solid State Relays either with or without an integrated RC-snubber are available as list- heat sink rated at 2.5 K/W. ed in the technical data. Should the thermal resistance for your application fall below the line noted “without heat sink” Diode no heat sink is required. Solid State Relays for DC loads have no internal contact protection. A diode or a RC-snubber for semiconductor protection must be connected externally and is recommended for inductive DC chassis mounted SSR’s have a slightly different derating diagram as shown on the data loads. sheet. To find the required heat sink draw a horizontal line for the output current and a ver- tical line for the ambient temperature. The intersection point indicates the minimum value of Fuses the thermal resistance as in e. (above). Follow F. to select the correct heat sink. To protect Solid State Relays the use of semiconductor fuses is recommended. To determine the suitable semiconductor fuse the max. load integral l2t is listed in the technical data for every A heat sink cannot be used for PCB mounted devices, but derating curves are shown for them. Solid State Relay. The value of the semiconductor fuse should be smaller than the maximum Follow the steps above. If the intersection point falls above the curve in the right diagram you load integral l2t of the Solid State Relay. cannot use the relay for the application parameters you plotted. Varistor On-off cycles longer than one minute cause greater than normal temperature differences in a The varistor conducts overvoltages and protects the output semiconductor of AC-SSR’s (triac, SCR. For these applications, derate the thermal resistance found in e. (above) byt an addition- thyristor, alteristor) against destruction. The use of varistors is recommended - the suitable al 0.75. In the example above, a heat sink with a thermal resistance of 2.1 K.W is required. varistor type is listed in the technical data. Therefore you should select the Gunther heat sink rated at 1.6 K/W. With Reversing Relays WG A0 a varistor is always recommended, because with reversing inductive loads (such as motors) the blocking voltage of the thyristor is easily exceeded. Heat Sinks The heat sinks are available from Gunther . All of them are assembled with 35 mm snap-on- Protection against Contact with the Terminals rail mounting and should be mounted in a vertical position. Furthermore it is very important In order to prevent unintentional contact with the terminals, a plastic protection cap for the that air circulation is not impeded. Solid State Relays WG A5, WG 280, WG 480, WG A3, WG A0 and WG F is available. Conducting Paste Approvals The Solid State Relays should be mounted with conducting paste between the heat sink and the SSR baseplate to ensure maximum thermal conductivity. Firm mechnical mounting is very UL, VDE important. Gunther Solid State Relays have been developed according to the regulations of UL and VDE and are tested according to their requirements. Many of the Gunther SSR’s are already approved by these institutions; applications for approval for the remaining series are in process.
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