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< Marsh Bellofram Group of Companies < Automatic Timing & Controls < Timers > 305E
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PDF icon 305E Series
305E Motor-Driven Analog Reset Timer
  • Highest Accuracy
  • Plug-In and Dust-Tight Design
  • Fastest Reset
  • Circuit Flexibility
  • Longest Life
  • Pilot Light
Product Detail:
Noted for its circuit flexibility, the 305E also provides the highest accuracy among analog timers. Available for either ON-Delay or
OFF-Delay operation.
The 305E provides delay, interval or pulse timing function for up to 7 load circuits through two instantaneous and two delayed switches. It features a plug-in design and cycle progress indication.
HIGHEST ACCURACY: Because of its exclusive infinite engagement clutch, the 305 has a repeat accuracy of 0.2%, highest of any timer in its class.
PLUG-IN AND DUST-TIGHT DESIGN: By virtue of its true plug-in design, the body of a 305E can be replaced in seconds without disturbing the housing or disconnecting the wiring. Its gasketed dial assembly forms a dust-tight seal against the housing, whether panel or surface-mounted.
FASTEST RESET: All 305 timers reset to a full-scale setting within 0.1 second, proportionately faster for shorter settings.
CIRCUIT FLEXIBILITY: All the contacts of its two instantaneous and two delayed load switches are externally accessible at a 14 point terminal block.
LONGEST LIFE: With an average mechanical life expectancy of over 5,000,000 operations before the first failure, the 305E is the leader in its class.
PILOT LIGHT: A built-in pilot light indicates that the timer is running.
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305E
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Specifications:
Models ON-Delay
OFF-Delay
Ranges (AC) 16 standard ranges, from 6 sec to 60 hrs. at 60 Hz (7 sec to 70 hrs. at 50 Hz) other ranges on special order.
Repeat Accuracy AC MODELS: ± 0.2% of full scale (For ranges of 60 sec or less, it may be necessary to run timer motor before start to achieve related accuracy)
DC MODELS: ± 1.75% of full scale at constant ambient temperature and ± 15% voltage variation (48, 125 and 250V models); ± 3.5% of full scale at constant voltage and 32 to 120°F ambient temperature variations (all models).
Reset Time 0.1 sec., full scale
Min. Settings 1/60th of range (all models except 0.3 sec for  6 sec model)
Dial Divisions 6 sec., 60 sec., 120 sec., 240 sec., 6 min., 60 min., 120 min., 240 min., 6 hr., and 60 hr. — 120 Dial Divisions
15 sec., 30 sec., 15 min., 30 min., 15 hr., and 30 hr. — 150 Dial Divisions
Life Expectancy MECHANICAL: over 5,000,000 operations
CONTACTS: 3,000,000 operations under resistive or inductive load of 1A
Timing Motor Synchronous, permanently lubricated
Timing Mode Single cycle interval or delay
Load Switches INSTANTANEOUS: two, each SPDT; self-cleaning, heavy-duty silver contacts.
DELAYED: two, each SPDT; precision type, silver contacts
CONTACT RATING (non-inductive):
10 amps, 120VAC
5 amps, 240VAC
1/4 amp, 115VDC
Pilot Light Wired in parallel with motor; standard with all AC and DC models
Terminals 14 screw terminals accessible at rear; integral wiring diagram on timer housing (On DC timers, terminal 10 is not available for load circuit use on units rated 48 V DC or higher)
Housing Plug-in design; completely gasketed, dust-tight when surface or panel-mounted
Power Requirements AC MODELS: 120 or 240V, 50/60 Hz (all ranges), (± 10%, - 10%)
DC MODELS: 48, 125 or 250V with zener regulations; 28V without zener regulation.
AC MODELS:   running current–0.128 A (115 VAC)
  inrush current–0.628 A (115 VAC)
Temperature Rating 32° to 140°F (0 to 60°C)
Weight NET: 2 lb., 6 oz.
SHIPPING: 2 lb., 12 oz.
Mounting Accessories STANDARD: Hardware is provided to mount timer so that it is dust-tight from front of panel.
OPTIONAL: Surface mounting with front or rear-facing terminals. NEMA 12 (See Accessories)