The Marsh Bellofram / ATC 365A-300-Q-30-PX is a microprocessor-based computing timer engineered for industrial time control applications demanding precision, repeatability, and reliability. The unit digitally clocks set points and recomputes time remaining with each adjustment, enabling accurate cycle shortening without timing loss. Its vacuum fluorescent display, dual 7A DPDT relays, and fully gasketed DIN housing deliver performance in harsh environments.
Technical Specifications
Timing Performance
• Timing range: 0.01 seconds to 999 hours across nine switch-selected ranges
• Repeat accuracy: ±0.10 seconds
• Reset time: guaranteed 20ms minimum, 40ms maximum
• Operate & release time: 10ms maximum
Display & Control
• High-intensity blue vacuum fluorescent display, three digits with decimal point
• Timing bar blinks once per second during cycle
• Configurable for Timeup or Timedown mode via DIP switch
• Display holds timeout value or elapsed time (time-down & go)
Relay Outputs
• Two heavy-duty 7A DPDT relays
• Instantaneous, interval, or delayed output control
• Contact rating: 7A @ 120VAC or 1/6 HP @ 120VAC
• Life expectancy: 10 million operations (no load)
Electrical
• Supply voltage: 120VAC, 50–60Hz
• Power consumption: <100mA @ 120VAC
Physical & Environmental
• Housing: 72mm² DIN profile
• Construction: fully gasketed with O-ring seals for dust-tight and water-tight panel mounting
• Transformer power supply with full-wave bridges and buffered logic for high noise immunity
• No moving internal electronic parts; microcomputer-driven timing eliminates drift from line voltage or power supply variations
• Protected against false reset from momentary power interruptions <30ms
– Key Features
• Microcomputer re-clocks set points throughout each cycle, ensuring accuracy even when reducing cycle duration
• Built-in self-diagnostics verify functional circuits without external test equipment
• Tamper-proof operation via selector knob removal
• Consistent reset timing independent of supply voltage fluctuations
– Typical Applications
Industrial process control, machinery sequencing, load relay switching, and cycle timing in environments with electromagnetic noise and variable power conditions.
– Compatibility & Integration
Standard 72mm² DIN housing integrates into industrial control panels. 120VAC supply with <100mA draw. Dual relay outputs support direct machine load control and external circuit interfacing.
