The catalog number 849A-ZAD25 represents a timer/counter unit with an “off delay” feature. The 849A-ZAD25 timer is a pneumatic timer component with a 0.05 to 180 seconds time range. The unit has an input voltage rating of 110 to 120 Volts AC and an operating frequency range of 50 to 60 Hertz. This pneumatic timing relay is part of Series C and it complies with standards like the UL 508 and CSA C22.2 (No. 14) standards. The 849A-ZAD25 timer unit is UL listed and it provides visual indicators which help the users to have better device control. The 849A-ZAD25 timer unit has a maximum voltage of 600 Volts AC and it comes with a NEMA Type 1 enclosure. The unit weighs around 2 kilograms (4.5 pounds) and it features approximate dimensions of 76.2 x 182.5 x 88.1 millimeters (3 x 7.1 x 3.4 inches).

The 849A-ZAD25 timer unit has a wide operating temperature range of -28 to 65 degrees Celsius (-20 to 150 degrees Fahrenheit) and it is designed for usage for industrial applications. Even though the timer unit has a wide operating temperature range, it must be noted that the minimum temperature is based on the absence of freezing moisture or water. The 849A series of timer units offer devices with 2 basic options. The first option is an “on-delay” capability and the other one is an “off-delay” capability like the 849A-ZAD25 timer has. The “on-delay” provides a delay after the coil is energized. The “on-delay” can be converted to an “off-delay” easily and vice versa. The manufacturer provides all the necessary instructions for such conversions. The repeat accuracy of these units is +/-10% of the time setting and the minimum reset time is 75 milliseconds.