NEMA Heavy-Duty Industrial Relays

Catalogs > Industrial Controls Catalog > Relays, Timers, and Temperature Controllers > Industrial Relays and Timers > NEMA Heavy-Duty Industrial Relays > Bulletin 849 Pneumatic Timing Relays

Bulletin 849 Pneumatic Timing Relays

Specifications

Contact Ratings

The timing unit is provided with a contact block having one normally open and one normally closed contact. Circuits wired to a contact block must be of the same polarity. Contacts are silver of the quick make and break type. Contacts have a control circuit rating listed below.

Those relays provided with auxiliary contacts have a similar contact block mounted on the solenoid frame and operated directly by the solenoid. The auxiliary contact block used on the AC relays is the same as the contact block on the timing unit and has the same rating. On the DC relays, the auxiliary contacts are rated 5A, 115V; 1A, 230V.

Typical Wiring Diagrams

Auxiliary Contacts

ON-DELAY

1 Set

2 Sets

OFF-DELAY

1 Set

2 Sets

Bulletin 849 and 849A (AC Only) Contact Ratings
NEMA A600 – Maximum AC Contact Rating Per Pole						DC
Max. AC Voltage 60 or 50 Hz	A		Continuous Carrying Current	VA		Voltage Range	Ampere Rating
	Make	Break		Make	Break
120	60	6.00	10	7200	720	115…125	0.4
240	30	3.00	10	7200	720
480	15	1.50	10	7200	720	230…250	0.2
600	12	1.20	10	7200	720

Contact Designations

Refer to diagrams in Product Selection tables.

• N.O.T.C.— Normally Open Timed Closed
  
• N.C.T.O.— Normally Closed Timed Open
  

• N.C.T.C.— Normally Closed Timed Closed
  
• N.O.T.O.— Normally Open Timed Open