Bulletin 849 Pneumatic Timing Relays
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| Product Overview |
Bulletin 849
- On-Delay
- Off-Delay
- Timing Range: 0.05…180 s
- Double Timing Units
- Visual Indications
- Manual Reset
- Auxiliary Contacts
- Type 1 Enclosures
Standards Compliance
UL 508
CSA C22.2 No. 14
Certifications
UL Listed (File No. E14840, Guide No. NKCR)
Product Selection
| AC 600V Maximum | |||
| Description | AC Volts 60 HzT ‡ | Open Type Without Enclosure |
Type 1 General Purpose Enclosure |
| Cat. No. | Cat. No. | ||
| “On-Delay” | 120 | 849-ZOD32 | 849-ZAD32 |
| Time delay after coil is energized | 208 | 849-ZOH32 | 849-ZAH32 |
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240 | 849-ZOA32 | 849-ZAA32 |
| 480 | 849-ZOB32 | 849-ZAB32 | |
| 600 | 849-ZOC32 | 849-ZAC32 | |
| “Off-Delay” | 120 | 849-ZOD33 | 849-ZAD33 |
| Time delay after coil is de-energized | 208 | 849-ZOH33 | 849-ZAH33 |
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240 | 849-ZOA33 | 849-ZAA33 |
| 480 | 849-ZOB33 | 849-ZAB33 | |
| 600 | 849-ZOC33 | 849-ZAC33 | |
| ¬ Refer to Contact Designations for contact designations. | |||
| T 50 Hz Relays: Relays as listed in the table above are suitable for use on 50 Hz at the voltages as listed in the table below. | |||
| ‡ 25 Hz Relays: When ordering, use the listed Cat. No. and replace the last letter with a letter selected from the table below. The 25 Hz coils have an intermittent duty rating for relays with two timing units. The intermittent rating is based on one minute on and four minutes off. | |||
| Hz | Volts | ||||
| 60 | 120 | 208 | 240 | 480 | 600 |
| 50 | 110 | — | 220 | 440 | 550 |
| Designation | D | H | A | B | C |
| Hz | Volts | |||
| 110 | 220 | 440 | 550 | |
| 25 | M | J | K | L |
Accessories
| Description | Cat. No. | |
| Surge Suppressor | A surge suppressor may be added to any Bulletin 849 timer with a 120V AC or 115V DC coil. The surge suppressor limits the voltage spike produced when the coil circuit is opened to protect nearby solid state devices. The suppressor is mounted on the side of the timer with a single screw and the leads are connected to coil terminals. | 849-N5 |
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. | |||
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
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OFF-DELAY
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| 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 |
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| 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
Approximate Dimensions
Dimensions are shown in millimeters (inches). Dimensions are not intended to be used for manufacturing purposes.
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| Description | Open Type | NEMA Type 1 Enclosure | ||||||||||
| A Wide |
B High |
C Deep |
D | E | Approx. Ship. Wt. kg (lbs.) |
A Wide |
B High |
C Deep |
D | E | Approx. Ship. Wt. lbs. (kg) |
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| On-Delay or Off-Delay |
68.26 (2-11/16) |
165.10 (6-1/2) |
80.96 (3-3/16) |
60.33 (2-25/64) |
57.15 (2-1/4) |
1.81 (4) |
112.71 (4-7/16) |
228.60 (9) |
120.65 (4-3/4) |
206.38 (8-1/8) |
92.08 (3-5/8) |
3.18 (7) |
| On- and Off-Delay – double unit |
73.03 (2-7/8) |
234.95 (9-1/4) |
80.96 (3-3/16) |
101.6 (4) |
57.15 (2-1/4) |
2.72 (6) |
— | — | — | — | — | — |
| DC On-Delay or Off-Delay |
76.20 (3) |
182.56 (7-3/16) |
88.11 (3-15/32) |
60.33 (2-3/8) |
57.15 (2-1/4) |
2.27 (5) |
112.71 (4-7/16) |
228.60 (9) |
120.65 (4-3/4) |
206.38 (8-1/8) |
92.08 (3-5/8) |
3.63 (8) |
| On-Delay and Off-Delay with two timing units |
120.65 (4-3/4) |
168.28 (6-5/8) |
80.96 (3-3/16) |
139.70 (5-1/2) |
103.19 (4-1/16) |
2.72 (6) |
— | — | — | — | — | — |
| On-Delay and Off-Delay – horizontal construction |
127.00 (5) |
103.19 (4-1/16) |
80.96 (3-3/16) |
90.49 (3-9/16) |
104.78¬ (4-1/8) |
2.72 (6) |
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| ¬ These units have only one top mounting hole located on the center line. | ||||||||||||