Sentry 300 550015 7-Day Timer Overview
The Sentry 300 550015 7-day timer is used to provide scheduled open commands on compatible 12 VDC gate operator systems. It is helpful for properties that want the gate open during specific days or time windows without leaving the gate manually latched open. In a properly configured system, the timer sends a control signal and the operator settings handle the gate movement and closing behavior.
This timer should be wired as an accessory command input, not as a power disconnect or safety override. The Sentry manual identifies it as a solar-friendly device and describes spade-terminal wiring to the Sentry control board. Correct programming, auto-close settings, and battery condition are important, especially on solar-charged systems.
Compatible With
Use this timer with compatible Sentry/USAutomatic 12 VDC gate operator control boards that support a timed normally-open command input.
- Sentry 300 swing gate opener systems using compatible 12 VDC accessory wiring
- Sentry 300S single swing and Sentry 300D dual swing timer applications
- USAutomatic 12 VDC gate operator applications where the 550015 timer is specified
- Solar-charged Sentry installations where low-current accessory draw is important
- Scheduled access applications for driveways, ranch gates, light commercial entrances, service windows, and gated properties
- Not a safety device, lock controller, loop detector, or standalone access-control system
Features and Specifications
| Manufacturer | USAutomatic / Sentry |
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| Product Type | 7-day programmable timer |
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| Part Number | 550015 |
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| System Voltage | 12 VDC systems |
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| Accessory Type | Solar-friendly low-current timer |
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| Output Function | Scheduled normally-open command, application dependent |
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| Connection | Spade terminals; verify exact Sentry control-board terminal locations |
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| Application | Scheduled gate opening or access window control |
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| Notes | Auto-close operation depends on gate operator settings and safe installation |
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Also Known As / Related Part Numbers
- 550015
- US-550015
- Sentry 550015
- Sentry 300 550015
- USAutomatic 550015
- US Automatic 550015
- Sentry 7 day timer
- USAutomatic 7 day timer
- 12 VDC gate timer
- solar friendly gate timer
Technician Note
If the timer opens the gate but the gate does not close as expected, check auto-close settings, safety inputs, gate limits, and timer schedule. A timer does not force a gate to close through an active safety fault.
Before Ordering Checklist
- Confirm the gate operator is a compatible 12 VDC system.
- Verify the timer is being used for a scheduled command, not as a safety bypass.
- Check the auto-close setup if the gate needs to close after a timed opening.
- Confirm battery and solar charging capacity before adding accessories to a solar system.
- Record the programmed schedule for future service calls.
Professional Advisory
Timer wiring should be performed with power disconnected and tested with the gate area clear. A qualified gate technician should verify scheduled operation, auto-close behavior, and safety-device response.
Product Questions
What is the Sentry 300 550015 timer used for?
It is used to send scheduled open commands to a compatible 12 VDC Sentry or USAutomatic gate operator system.
Will the 550015 timer close the gate by itself?
The timer can be used with the operator setup, but closing behavior depends on auto-close settings, safety inputs, limits, and the control board configuration.
Is this timer solar friendly?
Yes. It is commonly referenced as a low-current, solar-friendly timer for compatible Sentry 12 VDC systems.
Can I use the timer instead of fixing a keypad or receiver?
No. A timer is for scheduled operation. It does not replace normal access-control troubleshooting or required safety devices.
Why does my gate stay open after the timer runs?
Check the timer schedule, auto-close setting, safety devices, battery voltage, gate limits, and whether another access device is holding the open command.
