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< Marsh Bellofram Group of Companies < Automatic Timing & Controls < Timers < 353B Series
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353B Series Shawnee II Digital Programmable Timer
  • Control Versatility
  • Computer Tested Reliability
  • Save 40% in Panel Space and Cost
  • Wide Range
  • Noise Immunity
  • Cycle Progress Indication
  • Outstanding Repeat Accuracy
  • Cycle Progress Indication
  • Plug-In and Dust Tight
  • The 353B Directly Replaces 353A
Product Detail:
A compact version of the versatile 333 Timer, the ATC 353B is its exact functional duplicate. Packaged in a 72mm2 DIN-Size housing, it occupies 40% less panel space and costs proportionately less. Modern production and assembly techniques have all but eliminated hand wiring, enhancing the reliability and life expectancy of the 353B.
CONTROL VERSATILITY: The 353B operates either as a repeat cycle pulse generator or in single-cycle interval or delayed mode. You choose the kind of control action you want by installing jumpers on the terminal block. It also provides a choice of control output. Choose a standard plug-in SPDT relay or optional SPST solid-state switch module plus an independent-24VDC output signal at Terminal 16.
COMPUTER TESTED RELIABILITY: The solid-state 353B is manufactured from a series of computer-tested plug-in circuit boards and assembled virtually without hand wiring. Because it has no moving parts in its logic circuits, its life expectancy is practically unlimited. Even the load relay — the 353B’s only significant mechanical component — has a life expectancy of 100,000,000 operations (no load), while the optional solid-state switch module has virtually unlimited life expectancy. As a result, the 353B achieves an overall reliability that surpasses even the high level achieved by previous Shawnee timers.
SAVE 40% IN PANEL SPACE AND COST: Packaged in a 72mm2 DIN-size housing, the 353B occupies 40% less panel space than previous IC timers. Modern production and assembly techniques have substantially reduced manufacturing costs and resulted in a 45% cost saving.
WIDE RANGE: Each Shawnee II 353B timer covers the overall span of 0.01 sec to 999.9 min in four field-convertible ranges.
EASY TO SET: The Shawnee timer is easily and accurately set even with work gloves on. Push any of its four toggle levers in any sequence until the number you want appears above it. You can decrease as well as increase each number by pushing the levers up or down. You can change the setting at any time, even during a cycle.
NOISE IMMUNITY: The 353B does not have to be shielded: its transformer power supply, full-wave bridges, buffered logic and other design characteristics render it immune to the electrical noise that is sometimes encountered in industrial environments thus eliminating false starts and reset due to voltage spikes.
CYCLE PROGRESS INDICATION: The Shawnee 353B indicating timer provides cycle progress indication on a four-digit display located immediately above the digital setting number wheels. While the non-indicating Model 353B does not provide true cycle progress indication, it has a pilot light which is on during the timing cycle and a legend light which is on when there is power to the timer.
OUTSTANDING REPEAT ACCURACY: Unsurpassed among industrial timers regardless of cost, the Shawnee 353B has a repeat accuracy of ± 10 milliseconds on any setting within its overall range of 999.9 min, even in the face of wide swings in temperature or voltage and regardless of the amount of reset time between cycles.
PLUG-IN AND DUST-TIGHT: All 353B timers feature true plug-in design and are dust-tight from the front of panel.
Part Numbers:
Create Model Number >>>>>
353B
      
P
  
Range
346
A
30
P
X
999.9 Sec.
999.9 Min.
347
99.9 Sec.
351
99.99 Min.
352
Special
000
Voltage & Frequency
120/60
240/60
B
120/50
C
240/50
D
Arrangement
With Delay (ON-Delay)
Features
Basic plug-in unit
Standard Unit
Special
K
Options:
Accessories
0353-260-27-00 Surface mounting bracket kit
0305-265-61-70 Retrofit kit

Direct Replacement for 353A

Cart:
353B
Product Contact:
Sales Contact
Technical Contact
Specifications:
Models Both indicating and non-indicating models of the 353B are available. See ordering code.
Ranges Four field convertible ranges
0.01 - 99.99 sec.
0.01 - 99.99 min.
0.1 - 999.9 sec.
0.1 - 999.9 min.
Timing Modes Single cycle (interval or delayed) and repeat cycle pulse generator.
Start/Reset Signal Voltage Requirements
Positive Polarity
 Ready at 4.5V min. Reset at 1.0V max.
Negative Polarity
 Ready at 3.0V min. Reset at 1.0V max
Max. Continuous Input
 40 V
Ripple Voltage
 must not go below minimum required
AC Line  Voltage Input Impedance
 5K ohms.
Reset Time
Circuit Reset
 1 mSec max.
Relay Drop-Out
 20 mSec max.
Start Switch Requirements (isolated contact)
Switch Rating
 10mA 30V
Min Open Resistance
 1 megohm
Max. Closed Resistance
 20K ohms
Latching Mode Operation (interval only)
Min. Duration Start Signal
 50 µs
Max. Duration Start Signal
 continuous
Reset
 when signal is removed
Temperature Rating 32° to 140°F (0 to 60°C )
Power Requirements
120V
 95 to 132V, 50/60 Hz inrush – 0.4 A
running – 0.04 A
240V
 190 to 264V, 50/60 Hz
inrush – 0.2 A
running – 0.02 A
DC Power Supply Output (Terminal 7)
Voltage
 -24V ± 10%
Current
 40 mA max.
DC Output (Terminal 16)
Voltage
 ON – -24V ± 10%
OFF – -1V or less
Current
 with relay–5 mA max.
without relay–40 mA max
Impedance
 on – 10 ohms max.
off – 10K ohms
Pulse Generator Operation PULSE ON TIME(with relay): 80 ms. ± 20 mSec (may be shortened or lengthened by installing a resistor or capacitor, respectively, across Terminals 4 and 11; see Operation Section for details.)
Load Relay LIFE 100,000,000 operations (no load.)
CONTACT RATING: 5A at 120V AC
Solid-State Switch Module (Optional) Switches external DC voltage supply of positive polarity, 4 to 30V, 50 mA max. (details of operation described in installation manual.)
Accuracy ±0.01 sec. on all ranges
Minimum Setting 99.99 sec or min ranges: 0.01 sec. or min., respectively
999.9 sec or min. ranges: 0.1 sec. or min., respectively
Mounting Accessories Standard Hardware is provided to mount timer so that it is dust-tight from front of panel.
Optional Surface mounting without and with front-facing terminals. (See Accessory section of catalog)
NEMA 12 NEMA 12 case
(1 timer)
Weight NET: 1 lb., 7 oz. SHIPPING:
2 lbs.