QS121XXO12

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Panel indicators, like pilot lights, are used in many control system applications to indicate the operating state of the system and assign the user with visual feedback. The QS121XXO12 panel indicators offer versatile relay output operation in a standard ¼” panel cutout and feature LED and T-1 lamps. In addition to the QS121XXO12, a variety of panel indicator products with different voltage, current, and power ratings are available from numerous manufacturers.

The QS121XXO12 panel indicator is an optically isolated relay that features a 22.5V AC relay contact rating at 0.5A with zero cross turn-on. It is equipped with a green LED indicator and operates at 24V AC/DC. The T-1 indicator consists of a red LED that is illuminated when the relay is activated. Maximum on-state voltage drop is 4V. The QS121XXO12 is rated to a CP rating of 2 and features a single pole single throw (SPST) contact configuration. The indicator can be used with multiple switch points, allowing users to control multiple relay outputs with one indicator. The panel indicator is available in a variety of colors and sizes to meet the specific needs of the application.

The working principle of the QS121XXO12 panel indicator is based on optical isolation, which allows the system to operate in a standalone environment. The relay is made up of two halves, the optical and the electrical. The optical half consists of an LED transmit/receive pair, and the electrical half includes a transmitter, receiver and a relay. When the relay is activated, the output of the receiver is connected to the input of the output relay. The output of the output relay is then connected to the voltage required to control a particular device or circuit, such as a motor, valve, or switch.

The LED transmit/receive pair communicates with the relay and controls the operating state of the indicator. When the LED is illuminated, it sends a signal to the receiver, which in turn activates the relay. The relay then passes the signal to the output, activating the motor, valve, or switch, as desired. The status of the panel indicator can also be monitored with a visual feedback feature, which monitors the LED’s state. Depending on the product, the max on-state voltage drop for the QS121XXO12 is 4V with a continuous current rating of 0.5A.

The QS121XXO12 panel indicator is a reliable and efficient device for control system applications. The compact design of the device fits easily into panels and is easily installed. It can be used with multiple switch points, allowing for control of multiple relay outputs with one indicator. In addition, the LED transmit/receive pair and the feedback feature provide the user with visual feedback and added assurance that the system is operating correctly. The QS121XXO12 can be used in safety applications, as its zero-cross turn-on helps ensure that the system will not turn on on its own.

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