Brand: Intermatic | Manufacturer Part Number: ST01 | Big Frog Supply SKU: ST01
Product Overview
The Intermatic ST01 is a heavy-duty seven-day digital in-wall timer for single-pole or compatible three-way lighting and equipment-control applications. It provides up to 40 programmable ON/OFF events, allowing different schedules throughout the week. An astronomical clock calculates local dawn and dusk times, automatic Daylight Saving Time adjustment reduces seasonal reprogramming, and random mode can vary the schedule to create a more lived-in appearance.
The isolated switching design supports approved AC and DC loads within the timer’s ratings. A neutral connection is not required, which makes the ST01 useful for many retrofit wall boxes where only line, load, and grounding conductors are available. A replaceable CR2 lithium battery powers the display and internal clock and can provide up to three years of operation. The timer also includes a user-programmable countdown function and a two-hour countdown override. A decorator wall plate is required but is not included.
Key Features
Seven-day programmable digital timer
Up to 40 ON/OFF events
Astronomical dawn and dusk scheduling
Automatic Daylight Saving Time adjustment
Random mode
User-programmable countdown and two-hour override
Single-pole or compatible three-way operation
No neutral connection required
Replaceable CR2 lithium battery
White decorator format; wall plate not included
Common Uses
Indoor and outdoor lighting controlled from a protected wall box
Security and occupancy-simulation schedules
Fans, motors, and approved appliances within ratings
AC or DC switch-controlled loads
Technical Specifications
AC input/load range: 120–277 VAC, 50/60 Hz
Maximum events: 40
Minimum interval: 1 minute
Wiring: Single-pole or three-way
Neutral required: No
Maximum load: 15 A
Resistive heater: 15 A at 120–277 VAC
Motor rating: 1 HP at 120 VAC; 2 HP at 240 VAC
DC loads: 4 A at 12 VDC; 2 A at 28 VDC
Battery: Replaceable CR2 lithium
Dimensions
Height: 4.125 inches
Width: 1.75 inches
Depth: 1.813 inches
Installation Notes
Disconnect and verify power is off before installation. In a three-way circuit, the ST01 must be installed in the line-side wall box and wired according to Intermatic’s specific diagram; it does not connect exactly like a traditional three-way toggle. Confirm the connected load and conductor arrangement, install the CR2 battery, and use a compatible decorator wall plate. Electrical installation should be completed by a qualified person.
Frequently Asked Questions
Does the ST01 require a neutral wire?
No. The CR2 battery powers the display and internal clock, so no neutral connection is required.
Can it follow changing sunrise and sunset times?
Yes. Its astronomical clock calculates dawn and dusk scheduling.
Can it be used in a three-way circuit?
Yes, in a compatible three-way installation with the timer mounted in the line-side box and wired according to Intermatic instructions.
Is the decorator wall plate included?
No. A compatible wall plate is sold separately.
Why Buy This Product from Big Frog Supply?
The ST01 is useful when a wall timer needs weekly, astronomical, random, and countdown control without a neutral wire. Big Frog Supply clearly identifies its event count, voltage range, three-way limitation, battery, load ratings, and wall-plate exclusion so the exact timer can be confirmed before purchase.
Backup Type Battery
Color White
Input Voltage Range(s) 120-277 VAC, 50/60 Hz
MaximumOnOffOperations 40
Mechanism Type Digital/Electrical
Operation Mode 24 hour
Wiring Configurations 3-Way, Single
Minimum ON/OFF Times 1 min
Operation Features Astronomic, Daylight Saving Time
Wall Plate Configurations Single-Gang
Neutral Connection Required No
Backup Protection Time 3 years
Warranty Period 1-Year limited
Application Compatibilities CFL, Fluorescent, Incandescent, LED
Ballast Fluorescent 8 A, 120 VAC; 4 A, 208-277 VAC
Battery Service Type Replaceable
Battery Type CR2 Lithium
CAProp65Message
Please see the Warning @ www.P65Warnings.ca.gov
Country Of Origin Thailand
DC loads 4 A, 12 VDC; 2 A, 28 VDC
Electronic Ballast LED 5 A, 120 VAC; 2 A, 277 VAC
Inductive 4 A, 208 VAC, 50 Hz, 4 A, 208 VAC, 60 Hz, 4 A, 240 VAC, 50 Hz, 4 A, 240 VAC, 60 Hz, 4 A, 277 VAC, 50 Hz, 4 A, 277 VAC, 60 Hz, 8 A, 120 VAC, 50 Hz, 8 A, 120 VAC, 60 Hz
Inductive Load Ratings Ranges 8 A, 120 VAC, 50/60 Hz; 4 A, 208-277 VAC, 50/60 Hz
Max Load Handling Capability 15 A
Motor Load Ratings (Ranges) 1 HP, 120 VAC; 2 HP, 240 VAC
Resistive Heater 15 A, 120-277 VAC
Tungsten (Incandescent) Range(s) 1800 W, 120 VAC; 1248-1662 W, 208-277 VAC
Tungsten Incandescent 15 A, 120 VAC; 6 A, 208-277 VAC
Operating Temperature Max (°C) 40
Operating Temperature Max (°F) 104
Operating Temperature Min (°C) 0
Operating Temperature Min (°F) 32
