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Transparent plastic electromechanical timer with dial and override switch

Intermatic

Intermatic MIL72ASTUZH-24 24-Hour Electromechanical Timer SPDT 21A 24V AC

SKU CH-GJJZ-Q42M6

A 24-hour electromechanical timer with SPDT contacts rated at 21 amps and 24V AC, offering up to 48 on/off cycles per day with 15-minute minimum settings

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • 24-hour scheduling with 15-minute precision
  • 21 A SPDT contacts switch 1 hp at 120 V or 2 hp at 240 V
  • 96 trippers allow up to 48 on/off cycles per day
  • Surface or DIN-rail mounting fits panels and enclosures
  • Operates from −40 °F to 185 °F for harsh environments

24-Hour Electromechanical Timer

The Intermatic MIL72ASTUZH-24 is a 24-hour electromechanical timer designed for industrial electrical control and automation. It uses a synchronous motor to drive its switching mechanism and features a transparent plastic enclosure suitable for surface or DIN rail mounting. The unit includes an override switch for manual operation and comes with 96 trippers for programming.

21A SPDT Capacity and 48 Cycles

The timer provides a single-pole double-throw contact rated at 21 amps and 24 volts AC, with a 1 hp rating at 120 volts and 2 hp at 240 volts. It supports a minimum on or off setting of 15 minutes and a maximum of 23 hours 45 minutes, allowing up to 48 on/off cycles per day. This capacity suits lighting, pump or HVAC loads within the stated electrical limits.

Synchronous Motor and Temperature Range

Operation relies on a line-frequency synchronous motor, so timing accuracy depends on the stability of the AC supply. The timer functions across an operating range of -40 degrees to 185 degrees Fahrenheit. The plastic enclosure and electromechanical mechanism limit use to environments where these specifications are not exceeded.

Highlights

  • 24-hour scheduling with 15-minute precision
  • 21 A SPDT contacts switch 1 hp at 120 V or 2 hp at 240 V
  • 96 trippers allow up to 48 on/off cycles per day
  • Surface or DIN-rail mounting fits panels and enclosures
  • Operates from −40 °F to 185 °F for harsh environments

Specifications

BrandINTERMATIC
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Will the 24 V AC synchronous motor keep accurate timing if I wire it alongside my existing 120 V contactor?

Yes, the timer runs on 24 V AC independently; its SPDT contacts are rated 21 A and 1 hp at 120 V so they can switch the contactor coil without affecting the motor.

How can I verify the 15-minute minimum setting is actually advancing the dial after installation?

Set a single tripper for the shortest on-time, power the unit, and watch the dial rotate — each 15-minute step should click visibly and the override switch will toggle the load immediately.

Does the package include the 96 trippers needed for the full 48 on/off cycles, or must I order them separately?

The box contains 96 trippers, covering the maximum 48 on/off cycles; no extra trippers are required unless you lose or break some.

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