ATD Automatic Timer Disconnect

Nominal Voltage 12V DC
Amperage Operating Current 175mA (closed)
4mA (open)
Terminal Stud Torque 140 in-lb (15.82 Nm)
Cable Size to Meet Ratings 1 AWG (50mm²)
Charge Sense Connect 13.0V (3 sec)
Charge Sense Disconnect 12.75V (10 sec)
Disconnect Time 5 sec, 15 min, 30 min, 1 hr, 1.5 hr, 2hr, or 4hr
Input Voltage Range 9.5-16V
Low Voltage Disconnect 11.0V (10 sec)
11.5V (10 sec)
12.0V (10 sec)



Can be configured to be used as one of the following battery saving products

Timer Disconnect

  • 12V signal triggers relay to connect battery power to devices
  • When signal is removed the timer is activated and will disconnect devices after a preset time
  • Timer ranges from 15 minutes to 4 hours

Low Voltage Disconnect

  • 12V signal triggers relay to connect battery power to devices.
  • After 12V signal is removed, device senses low battery voltage and automatically disconnects devices.
  • Low voltage setting can be used in conjunction with Timer Disconnect. Low voltage will disconnect devices prior to preset time to preserve battery power

Automatic Charging Relay

  • Automatically combines two batteries when charging, and isolates them when discharging
  • Single side sensing design only monitors the voltage of the start battery
  • Ideal for auxiliary batteries that are AGM or significantly larger than the start battery


  • 12V signal will connect or disconnect relay without any time delay