NEMA Heavy-Duty Industrial Relays

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Bulletin 849 Pneumatic Timing Relays

Modifications

A large variety of timers can be provided by modifying the basic styles listed above. The table below lists available modifications. The Cat. No. of a timer with modifications is the Cat. No. of the basic timer to which is added the numbers selected from the second column in the table below. Example: 849-ZOD326.

Description		Cat. No. Code	Kits for Field Installation⋆
			Cat. No.
Dial indicator on timing mechanism. A dial for visual indication of the adjusting screw position can be added to the timing unit. The dial gives a reference position to which time can be preset for known machine operations. This is not a calibrated indicator.		2	—
Dial indicator on timing mechanism and one set instantaneous auxiliary contacts		3	—
Dial indicator on timing mechanism and two sets instantaneous auxiliary contacts		4	—
Auxiliary Contacts One set of instantaneous auxiliary contacts 1 N.O. – 1 N.C.	On-Delay Timer Off-Delay Timer Off-Delay with two timing units	1	849-N1A
	On-Delay with two timing units	1	849-N2A
Two sets of instantaneous auxiliary contacts 2 N.O. – 2 N.C.	On-Delay Timer Off-Delay Timer Off-Delay with two timing units	7	849-N3
	On-Delay with two timing units	7	849-N4
Maintained contact manual reset timing unit. Timers can be provided with a reset button to reset the timing units contacts after they have operated.		5	—
Maintained contact manual reset unit and one set instantaneous auxiliary contacts		6	—
⋆ For AC Timers only.