Relays have been the traditional building blocks of control since the 1950s. Still in wide use for simple control or power conversion, styles include electro-mechanical general or special purpose relays such as high power or hazardous location styles, as well as solid-state relays.
Electromechanical relay switches are available in square relay / ice cube relay, plug-in relay, octal relay, power relay, hazardous location (HAZLOC) relay, latching relay, slim / card relay, panel mount, socket mount and DIN rail relay styles for use in a wide range of process control applications.
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A solid state relay switch is a control relay with isolated input and output, whose functions are achieved by means of electronic components without the use of moving parts such as those found in electromechanical relays.
These electronic relays are ideal for applications with many contact closures since solid state relay switches offer a greatly extended life compared to electromechanical relays.
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Murrelektronik optocouplers and semiconductors are used to combine different signal levels or to isolate one signal from another. They are similar to a relay interface because they provide an optoelectronic signal transfer between input and output. Optocouplers and semiconductors have a long life span because they don't have any mechanical components that could wear out. They are suitable for applications with high switching frequencies, even over a long time.
Phase monitor relays provide protection against premature equipment failure caused by voltage faults on 3-phase systems. ProSense® phase monitor relays are compatible with typical Wye or Delta systems.
Alternating relays are used in special applications where the optimization of load usage is required by equalizing the run time of two loads.
PSFR relays are designed to monitor the shaft seals of submersible pumps. The relay output can be used to give an alarm indication of a leaking seal. The relay will automatically reset when the fault condition clears.
The ISD Series of Intrinsically Safe Relays provide a safe and reliable method to control up to four loads (motor starters, relays, etc.) with up to four input devices (switches, sensors, etc.) located in a hazardous area.
The ISE Series of Intrinsically Safe Relays provide a safe and reliable method to control a single load (motor starters, relays, etc.) with a single input device switches, sensors, etc.) located in a hazardous area.
A variety of relay sockets and accessories for various types of relay switches are available:
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Timer Relays/ Time Delay Relays / Multi-Function
Digital Counter, Timer, Tachometer:
AutomationDirect offers solid state timers and digital timer relays from two leaders in the industry: FUJI Electric and Koyo. All timer relays meet UL and CE conformity. Koyo has been selling timer relays for over 30 years. FUJI Electric has been selling industrial timing relays in the U.S. since 1970.
AutomationDirect CTT series multi-function devices are easily configured for operation as digital counters, digital timers, combination timer-counters, or digital tachometers.
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