Intermatic 171 24-hour Mechanical Time Switch 40A Spst

Product Description

The INTERMATIC 171 is a 24-hour mechanical time switch designed for indoor use in a metal enclosure. It operates on 120 volts AC at 60Hz with a single-pole single-throw (SPST) configuration rated at 40 amps and 125 volts. The switch supports up to 10 ON/OFF settings per day with a 1-hour interval, giving electricians and facility technicians precise scheduling control over connected electrical loads. The Skip-a-Day feature uses three included skipper screws to omit the programmed schedule on selected days, reducing unnecessary load cycling without reprogramming the entire switch. Licensed electricians typically handle installation in commercial and residential applications.

The INTERMATIC 171 is suited for indoor electrical installations where automated load control is required on a daily or modified daily schedule. Typical applications include lighting circuits, HVAC equipment, water heaters, and other 120-volt loads up to 40 amps. The metal enclosure provides physical protection for the mechanism in utility rooms, mechanical spaces, and service panels. The T170 Series, which this unit belongs to, is commonly used in both residential and light commercial settings where flexible scheduling with day-omission capability is needed.

Key Features

• Up to 10 ON/OFF settings per day with 1-hour interval increments
• Skip-a-Day capability via three included skipper screws — omit scheduled operation for at least three days
• Includes one set of ON/OFF trippers for initial setup
• SPST configuration rated at 40 amps and 125 volts for heavy-duty load control
• Indoor metal enclosure for durable, protected mounting in mechanical and utility spaces
• 120 volts AC, 60Hz operation compatible with standard North American electrical systems

Compatibility

Designed as an OEM-style replacement or direct-install mechanical time switch for indoor 120-volt AC, 60Hz SPST applications requiring 24-hour scheduling with skip-day functionality.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Disconnect and lock out all power to the circuit before wiring or servicing the time switch. Mount the metal enclosure securely to a wall or panel surface before making wiring connections. Do not exceed the 40-amp or 125-volt ratings of the switch contacts.

Technical Specifications

• Voltage: 120 volts AC
• Frequency: 60Hz
• Amperage: 40 amps
• Contact Rating: 125 volts
• Switch Configuration: SPST
• Schedule Interval: 1 hour
• Max ON/OFF Settings Per Day: 10
• Enclosure Type: Indoor Metal
• UPC: 078275171015

Standard Information

• Brand: INTERMATIC
• Manufacturer Part Number: 171