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      Relay FAQS

      What is the significance of IDEC’s Universal Relay?

      The adaptable RU series is available in two pole (DPDT) and four pole (4DPDT) configurations. A non-polarized green indicator LED, a mechanical indicator flag, an easily accessible and replaceable marking plate, and a manual latching lever coded orange/red for AC coil and green/blue for DC coil are all standard features on both the RU2 and RU4 models.

      The internal construction of RU relays distinguishes them from other relays. There is no internal wiring, so there are no weak solder points and the manufacturing process is completely lead-free. The contacts are also cadmium-free, making the RU relays eco-friendly. All RU relays are also manufactured using a completely automated assembly process, which means the relay is of the highest quality because human error is eliminated during the manufacturing process.

      What is a force guided relay?

      IDEC’s force-guided relays are critical electromechanical switching components that provide a failsafe within safety circuits while also detecting failures such as contact welding or contact spring damage. These relays are critical in safety control applications because they are frequently used in conjunction with elevator controls, interlock switches, light curtains, and emergency stop switches. The RF1V series is a low-cost and simple way to increase mechanical contact outputs.

      What is the difference between a contactor and a relay?

      More often than not, contactors are used in three-phase applications while relays are more generally used in single-phase applications. A contactor does not have a common between the phases and joins 2 poles together. A relay uses a common contact that connects to a neutral. Contactors are usually rated up to 1000Vand relays are typically rated up to 250V. Most applications that have a rated current of 10A or more normally use contactors.

      Is it possible to connect Solid-state Relays in parallel?

      It is, indeed.

      Solid-state Relays are connected in parallel in order to prevent open circuits.

      Due to the difference in output ON voltage drop between the Solid-state Relays, only one of the Solid-state Relays is typically turned ON, leaving the other Solid-state Relay in the OFF state. As a result, do not connect two or more Solid-state Relays in parallel to drive a load that exceeds each Solid-state Relay's capacity. Otherwise, Solid-state Relays may stop working. The load current cannot be increased by connecting the Solid-state Relays in parallel. If an ON-state Solid-state Relay in operation is open, the other Solid-state Relay will turn ON when the voltage is applied, preserving the load's switching operation.

      What is the difference between MTBF and service life?

      The acronyms MTBF (Mean Time Between Failure) and service life are often mistaken as one and the same. In reality, they represent different aspects of reliability. Higher temperatures make the values much worse for both MTBF and service life.


      The MTBF refers to average amount of how frequently a unit fails. While efforts are made to minimise the number of failures, it's inevitable that electrical products will eventually fail. The frequency of failures is represented by the failure rate λ. In practice, the MTBF is used more often as it's expressed in hours, making it easier to understand. The failure rate shows the expected number of failures for a given number of units over a period.

      Service life is the length of time after which components become unusable due to wear and tear, not due to normal operational failures. Service life refers to the number of years a power supply can perform its designated function before it becomes unserviceable. Electrolytic capacitors, which contain liquid electrolyte, have the most significant impact on the power supply's service life. The service life ends when the component's parameters such as capacity and internal resistance have degraded by a certain amount. The service life of an electrolytic capacitor depends on its type and operating temperature, with every 10°C increase reducing the service life by half.

      What’s a latching relay?

      A latching relay is a relay that is activated (ON) or deactivated (OFF) by a pulse voltage input. Even if the input voltage is interrupted, this relay remains set or reset until the next inverting input is received. It is also known as a keep relay.

      There are two types of mechanisms for maintaining the set and reset conditions: A magnetic holding type and a mechanical holding type.

      There are also two types of coils for applying the set and reset pulse voltages: A single-winding type and a double-winding type.

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