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TX2SA-L2-4.5V Application Field and Working Principle

The TX2SA-L2-4.5V is one of the signal relays up to two amps with a specifications range from 5V/5V DC to 110V/110V AC and SPDT contacts.

TX2SA-L2-4.5V is mainly applied to telecom equipment, communication systems and audio/video system with a small volume of signal current (maximum current around 2A). Also due to its stability and ruggedness, this kind of relays can be used on small-size electric appliances where low level on/off switching is required.

Working Principle

The basic operating principle of this type of signal relays is simple. A current applied to the relay by an electromagnet, or coil, changes the shape of its metal core and the moving arm of the relay is pulled, or released, to open or close the contacts. This commutation is achieved mainly thanks to the air gaps in the magnetic circuit: when the coil is de-energized the air gaps create a high reluctance path for the magnetic flux, and the moving arm of the relay is pulled.

The relay actuates when the current passing through the coil exceeds the “pick-up current” (or initial current) level. This current is typically about 40-50 mA.

The relay will de-actuate when the current passes through the coil drops to a value lower than the “drop-out current” (or release current). This current is typically smaller than 5-10mA.

Types

The TX2SA-L2-4.5V signal relays come in two versions, with alternate current (AC) and direct current (DC). AC output relays are activated by a sinusoidal wave form, while DC output relays are activated by a continuous current signal.

TX2SA-L2-4.5V AC output relays come in several switch options, which include Single Pole, Double Pole, Single throw (SPST), Double throw (DPST), and Triple Throw (SP3T). These different configurations permit multiple circuit operation using a single relay. For example, the 3PDT type is typically used in audio switching applications.

TX2SA-L2-4.5V DC output relays are available in SPST (Single Pole Single Throw) and DPST (Double Pole Single Throw) configurations, which permit two or more circuits to operate independently using a single relay.

Reliability and Testing

TX2SA-L2-4.5V signal relays are designed to provide reliable operation for long periods of time with low levels of contact bounce and low levels of arc suppression. Relay contacts have a long useful life and are available in several different grades of alloy, so that the suitability of each contact to a particular application can be precisely determined.

To ensure the best performance and reliability, TX2SA-L2-4.5V relays have successively passed strict tests and quality control. An extensive range of operational and performance tests are performed in accordance to the applicable standards. The manufacturing process of the relays itself also accepts random samplings for quality control.

Conclusion

In conclusion, the TX2SA-L2-4.5V signal relays provide reliable operation up to two amps of current, coming with a series of different switch configurations and contact alloys for precise matching to particular applications. Rigorous quality tests ensure the best performance and reliability of the relay.

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