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Rainbird ESP-SM3 3 Station Expansion Module

List Price: $37.00
Item Number: RBESPSM3

Manufacturer: Rain Bird
Manufacturer Part No: ESPSM3

Rain Bird® ESP Modular Irrigation Controllers
Maximize Your Productivity

The ESP Modular Irrigation Controller is designed to maximize your productivity by saving you time and money. Easily expand from a 4 station base model to 13 stations with 3 station hot-swappable modules, which can be added without powering down the controller.

Another example of Rain Bird's legendary reliability, the ESP Modular offers industry-leading surge protection, temperature tolerance and rugged construction. It improves upon Rain Bird's already easy-to-use ESP style of programming with a large, easy to read display and intuitive programming sequence, making this the most user-friendly irrigation controller in its class. The spacious cabinet and terminal locations make installation and wire-up a snap. And features like the Contractor Default program make service calls more efficient and earn you more money by taking less time! The Rain Bird ESP Modular: Maximizing your Productivity.

More Reliable:

  • NEW! 5-year lithium battery (Rain Bird Exclusive) and non-volatile memory, keeps time, date and program schedule in case of power outage.
  • Superior surge protection — withstands nearly 3 times higher electrical surges than competitive controllers.
  • Rain Bird quality construction and components.
  • Fuseless, diagnostic circuit breaker identifies a station with valve or wiring problems and continues to water operable stations.

More Flexible:

  • Easily expandable from a four station base model to 13 stations with the additon of 3-station modules at installation or in the future. Modules can also be installed in any available slot.
  • NEW! Longer station run times add more flexibility for special applications such as drip.
  • NEW! Programmable master valve allows pump to operate only as needed, resulting in greater flexibility in controlling the water source.
  • NEW! Programmable Delay Between Stations allows additional time between zones for water well recovery or slow closing valves.
  • Auxiliary Station can be set to bypass an active sensor to allow watering even if the other stations are disabled or can be set as a normal station.
  • 365-day calendar with leap year intelligence means that you can set an “Odd” or “Even” day watering schedule and not worry about changing the date on leap years.
  • Four irrigation cycle modes for maximum flexibility and compliance to all major watering restrictions (Custom 7-day calendar, cyclic 1-31 day interval, and odd/even day calendar).

Easier for You:

  • Contractor Default Program (Rain Bird Exclusive!) allows retrieval of a default program you save in to memory. Easily replace a schedule that has been altered by the homeowner in seconds.
  • Hot swappable modules allow adding more stations without powering down the controller.
  • NEW! Improved Ribbon Cable provides better visibility and ease of connection.
  • Larger cabinet space provides more room for wiring installation.
  • “Valve Test Terminal” allows the installer to test the valve wires during installation to determine the valve that each wire is connected to.
  • Spacious heavy-duty cabinet with internal junction box provides lots of room for wiring and eliminates the need to purchase an external j-box for a clean and professional looking installation. Outdoor model comes with key-locking cabinet.

Easier for Your Customers:

  • Easy programming: Rain Bird's easy to use Extra Simple Programming style with larger LCD dispaly.
  • Time, date and program schedule are stored in case of a power outage.
  • Enhanced Diagnostic Feedback™ alerts the user to conditions when watering is suspended due to an activated sensor, shorted stations or programming errors with a warning light and text message on the LCD.
  • Permanent Day off allows the user to set any day of the week as a non-watering day in any program or schedule, making it easy to comply with watering restrictions or other requirements such as weekly lawn care or maintenance.
  • Global Season Adjust (0-200%) allows the user to alter the run time of all the valves in every program with the push of a button.
  • Dedicated sensor terminals allow the user to easily connect a sensor to the controller for maximum water efficiency.
  • Sensor bypass switch allows the user to override an active sensor.

Operating Specs:

  • Number of programs: 3 independent
  • Automatic Starts: 4 per program, 12 total
  • Station timing: 0 to 6 hours for all stations
  • Independent programming schedules:
    - Custom (user selects the day of the week to water)
    - Odd (watering occurs on only odd days of the month except the 31st and February 29th on a leap year)
    - Even (watering occurs on only even days of the month)
    - Cyclical (watering occurs between from once a day to once every 31 days)

Electrical Specifications:

  • Input required: 120 VAC 20%, 60Hz
  • Output: 25.5 VAC 1A
  • Surge Protection: Primary input side has built in MOV (metal oxide varistor) to protect microcircuitry. Output side has 1 built in MOV for each valve station
  • Power back-up: Lithium coin-cell battery maintains time and date while non-volatile memory maintains the schedule
  • Multi-valve station capacity: Up to two 24 VAC, 7VA solenoid valves per station plus a master valve


  • Width: 10.7 in. (27,2 cm)
  • Height: 7.7 in. (19,5 cm)
  • Depth: 4.4 in. (11,2 cm)


  • ESP-4Mi: 4 station indoor model*
  • ESP-4M: 4 station outdoor model*
  • ESP-SM3: 3-station module
    *Available in 120VAC, 230VAC, 240VAC models

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