304 ATC | Alldatasheet

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Technical content

Automatic Timing & Controls 800.727.5646 atcdiversified.com Percentage Timer MODELS 304E plug-in Choice of three: 304E non-plug-in 304C non-plug-in RANGES 15 SEC @ 60 c ycles (18 SEC @ 50 cycles) Choice of three 30 SEC @ 60 c ycles (36 SEC @ 50 cycles) standard ranges. 60 SEC @ 60 c ycles (72 SEC @ 50 cycles) REPEAT ACCURACY ± 0.1% DIAL CALIBRATION 5 to 95% on time, in 1% gr aduations. FULL ON, FULL OFF FEATURE. When pointer is set below 3%, load s witch contacts ar e open continuously, above 98%,contacts ar e closed continuously. LOAD SWITCH One SPST(quic k make, quick break) s witch with self-cleaning heavy-duty silver contacts. CONTACT RATINGS 304C 25A at 120 V AC 20A at 240 V AC 304E 15A at 120 or 10A at 240 V AC plug-in unit. Non-plug-in unit same as 304C POWER REQUIREMENTS 120 or 240V , 50/60 Hz; 50 mA r unning current. TERMINALS 4 screw terminals accessible at rear; wiring dia gram on housing. TEMPERATURE RATING 32° to 120°F (0°to 50°C) WEIGHT NET : 1 lb., 2 oz. SHIPPING: 1 lb., 7 oz. SPECIFICATIONS OPERATION Easily the most rugged and dependable of industrial per centage timers, the ATC 304 incorporates heavy-duty contacts that are capable of switching loads as large as 4.6 KW directly. LARGE CONTACTS: Self-cleaning silver contacts are 3/8 inch in diameter, larger than in any other make of percentage timer. They easily provide 1,000,000 operations at the full rated load of 25 A (non plug-in models). RUGGED AND TROUBLE-FREE: Every component of the 304 has been refined and improved over the years to provide dependable operation for at least 3,000,000 cycles. Its classic simplicity of design makes it virtually trouble-free. CONVENIENT ADJUSTMENT: Graduated in easily read 1% increments, the 304 provides continuous adjustment of on time between 5 and 95%. It also switches the load off continuousl y when the pointer is set below 3%; and on continuously, when the pointer is set above 98%. The 304 is available in a choice of 15, 30 and 60-second time cycles (60 Hz). Its synchronous motor drives a cam which repeat- edly closes the SPST load switch for a percentage of the time cycle, as set on the timer dial, and opens it for the remainder of the cycle. When the dial pointer is set below 3%, the load switch stays open for the full cycle; it remains closed when the pointer is set above 98%. An optional Hold switch also disconnects power to the timer motor when the pointer is set below 3%. Series 304 timers operate continuously and do not reset on power interruption; when power is restored, they resume the interrupted cycle. TYPICAL APPLICATIONS: Ideal for controlling wattage input to electrically heated equipment, the 304 non-plug-in models can pulse loads up to 4.6 KW directly through the SPST load switch; the plug-in models can switch up to 2.3 KW loads directly. The 304 can be used with other types of electrical equipment to control the ratio of on time and off time in a fixed time cycle. In many types of ratio and cascade control systems, the 304 provides rate-of-rise set point drive control; special dial calibrations are available for this application. PERCENTAGE TIMER 304 Series E24305 Automatic Timing & Controls 800.727.5646 atcdiversified.com

PERCENTAGE TIMER 304 Series MODEL NUMBER MODEL NUMBER 304E RANGE 15 SEC @ 60 Hertz 004 (18 SEC @ 50 Hertz)

30 SEC @ 60 Hertz 006

(36 SEC @ 50 Hertz)

60 SEC @ 60 Hertz 007

(72 SEC @ 50 Hertz) Special 000 VOLTAGE & FREQUENCY

120 VAC A

240 VAC B

Standard 0 to 100% Dial 00 Special 99

FEATURES

Standard non-plug-in timer X STANDARD X Special K MODEL NUMBER 304C RANGE 15 SEC @ 60 Hertz 004 (18 SEC @ 50 Hertz) (36 SEC @ 50 Hertz) (72 SEC @ 50 Hertz) Special 000 VOLTAGE & FREQUENCY Standard 0 to 100% Dial 00 Special 99 STANDARD UNIT/NON-PLUG-IN X Special K DIMENSIONS (INCHES/MILLIMETERS) 304E PLUG-IN 304E NON-PLUG-IN 304C NON-PLUG-IN