RN2B48D50

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Solid State Relays (SSRs) are a type of relay that use a semiconductor as the switching element. Unlike traditional electromechanical relays (EMRs), solid state relays have no moving parts and can handle higher voltages and currents which makes them more reliable and longer lasting. The RN2B48D50 belongs to the RN2B series of SSRs and is designed for specific applications. This article explores the applications and working principles of the RN2B48D50.

Applications

The RN2B48D50 is a single-pole double-throw (SPDT) solid state relay with an input voltage (Vin) of 5-38VDC and rated current of 3A. It is ideal for applications such as process control, thermostats, automated assembly lines, lights, motors, timers, and HVAC systems. The low input voltage makes the RN2B48D50 suitable for general-purpose projects and embedded systems. The switch contacts support both normally open (NO) and normally closed (NC) operation and can work with both AC and DC signals.

Working Principle

The RN2B48D50 switching element is an insulated gate bipolar transistor (IGBT). When a specified input voltage is applied to the gate terminal of the IGBT, current is allowed to flow from the collector to the emitter, switching the relay on. The voltage at the gate terminal is called the control voltage. The output voltage is then routed to the required destination.

The output voltage of the RN2B48D50 can be configured to be between 20 and 220VAC or 24 to 330VDC. It has armature resistance of 0.2-100 ohms and insulation resistance of 500M ohm or greater. The relay also has built-in TVS modules with 2500V static electricity immunity and surge protection. The operating temperature range of the RN2B48D50 is between -30 and +85°C.

The presence of the NMI (non-contact monitoring) terminals adds an additional layer of safety. These terminals are open by default and can be connected to the gate terminal of the IGBT. If the voltage drop across the gate is low (which means the relay has switched off), then the NMI terminal will be closed. This allows for a secondary level of over-protection for the user.

Conclusion

The RN2B48D50 is a reliable and robust SPDT solid state relay for controlling and switching electronic loads with a voltage range of 5-38 volts. It has features such as non-contact monitoring terminals and built-in TVS modules to protect the user from any static electricity and surge events. It is the ideal choice for applications such as thermostats, automated assembly lines, lights, motors, timers, and HVAC systems.

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