The 849A-ZAA24 device from Allen-Bradley is a timer device. It has been designed and manufactured as part of the Allen-Bradley 849 Timing Relays series. The 849A-ZAA24 timer runs on AC voltage and its maximum voltage rating is 600 Volts AC. The 849A-ZAA24 timer has been manufactured as a pneumatic timing relay device with the UL 508 and the CSA certifications. It is made to measure and keep track of the delay time in industrial pneumatic pressure systems and their applications. The 849A-ZAA24 timer comes with a contact block that has 1 normally closed contact and 1 normally open contact on it. If it is wired to a wiring circuit contact block, this wiring circuit contact block must have the same polarity as the timer or they will be incompatible.

The contacts that the Allen-Bradley 849A-ZAA24 pneumatic timer from the 849 Timing Relays series uses are made of silver and they are the rapidly opening and rapidly closing types of contacts for maximum efficiency and maximum timing accuracy. The 849A-ZAA24 timer can support frequency levels of 50 or 60 Hertz at its 600 Volts AC voltage rating. Its load range voltage rating is 230 Volts to 250 Volts and its nominal load current rating is 0.2 Amps. The 849A-ZAA24 timer’s VA rating for contact opening is 720 VA while its VA rating for contact closing is 7200 VA. The continuous carrier current rating is 10 Amps. The 849A-ZAA24 pneumatic timing relay device has been designed to meet the NEMA industrial standards for safety and efficiency, like all the other timing relays from the 849 series.