BN-LINK SU101D Programmable In-Wall Timer Switch, 18 Programs, 3-Way

At a glance

The BN-LINK SU101D puts weekly lighting and fan schedules right at the wall switch, so routine on/off times can run automatically. Set up to 18 programs across individual days or preset day combinations, with intervals as short as one minute. A blue backlight makes the controls easier to see, and manual mode lets you operate the switch without relying on the schedule. Need a more flexible alternative to a basic wall switch? This model supports both single-pole and 3-way setups.

Use scheduled control for porch, entryway, hallway, garage, or patio lights, or for compatible fans and motors. Random mode shifts programmed on and off times by 0–30 minutes to create a lived-in appearance while you’re away. Daylight Saving Time adjustment helps keep the schedule aligned when the clocks change, and a built-in rechargeable backup battery preserves settings during a power outage. Customers describe the timer as dependable and useful for applications such as porch lighting, while feedback on programming and instructions is mixed, taking time to set and review each program can help keep a weekly routine clear.

Getting the most from it

Choose this timer when you want recurring on/off routines managed at the switch rather than turning lights on and off manually each day. It’s especially useful for a porch light that follows a regular schedule, an entryway that should be lit at set times, or a hallway or garage light controlled from two locations. For periods away from home, Random mode varies the programmed times, while AUTO runs the schedule and MANUAL provides direct control.

The switch is rated for 125VAC, 60Hz, up to 15A/1875W, with separate ratings of 10A/1250W for tungsten and ballast loads and 1/2 HP. It is ETL listed. The installation requires a neutral wire and is intended for an indoor wall location, it can control outdoor lights when the timer itself is installed indoors. A wall plate and wire nuts are included. Match the wiring setup to a single-pole or compatible SPDT 3-way circuit before installation.

Usage tips

Plan the weekly routine first, then assign programs to the days and times you need. The 18-program capacity gives you room to set different on/off periods across the week, individual days and preset day combinations are available. After programming, use the controls to check the entries and confirm the timer is in AUTO mode when you want scheduled operation. MANUAL mode is available for immediate on/off control, and Random mode can be selected when you want the timer to vary its programmed times. The blue backlight is useful when setting the controls in a dim hallway, garage, or other indoor location.

Practical questions

Does installation require a neutral wire? Yes. A neutral wire is required for this timer switch, so the wall wiring must provide one.

Can it be used in a 3-way setup? Yes. It supports single-pole and 3-way configurations and is compatible with SPDT switches, allowing control of the same light from two locations in a suitable circuit.

Can it control outdoor lights? Yes, when the timer switch is installed indoors and wired to control those lights. The switch is intended for indoor installation.

Is it worth it?

The SU101D is a practical fit for households that want more control than a standard manual switch provides, particularly when lights or fans follow a repeating weekly routine. Its 18 programs, day-by-day scheduling, random vacation mode, and manual override bring several useful options together in one wall-mounted timer. For porch, entryway, hallway, or garage lighting—and compatible fan or motor loads—it offers a straightforward way to put everyday switching on a schedule.