TH100A Current Interrupter

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All new M.C. Miller meters include a Calibration Certificate.


TH100A Current Interrupter 100 Amp


The TH100A is a modern current interrupter using the latest technology in current control and digital communication.
  • Interrupts 100 A at 150 VDC
  • Cool to the touch - even at full rated current
  • Can be synced to Cronos, JR-1, or JR-2 units - works with your existing interrupters
  • Can provide immediate or scheduled interruption operations
  • Compact, lightweight, sturdy construction
  • WPAN enabled
  • Configuration is through a user-friendly touch-enabled Android™ application.
  • High accuracy Real Time Clock, On/Off cycles from 50 milliseconds to 64 seconds, in 1 millisecond increments
  • Powered by 4 user-replaceable AA batteries
  • New TH100A 100Amp Current Interrupter
  • Green 6 Foot (1.83 m) Straight Lead with 27-C (40 Amp) Clip (Item #33910)
  • Dual 100 amp Power Cable (Item #SUB577)
  • Sync Cable Assembly (Item #12845)

This unit has all the functionality of a 100 Amp interrupter plus the convenience of WPAN programmability, as well as M.C. Miller's high quality components and manufacturing standards at a price that will make the office budget happy.

Please Note: An Android device is required to configure the unit. Download the TH100A Configuration Application found on the Downloads tab with your Android device and connect to the unit via WPAN technology.

Notice: This device contains a lithium battery and according to FAA/IATA regulations, should not be placed in checked baggage. For more information, go to: FAA.Gov/PackSafe

  • Accuracy: On/Off cycles’ accuracy to 1 millisecond, continuing operation shifts less than half second a day
  • Relay: Solid State
  • Battery: (4) Standard AA batteries
  • Estimated Battery Life: 300hrs @ 4s On/Off Cycle
  • Environmental:
    • Temperature Range: Based on alkaline batteries @ 0°F to 131°F (-18°C to 55°C)
    • Rating: IP65 rated
  • Interrupting Capacity: 100 amps @ 150 V DC
  • Dimensions:
    • Length: 6.75 inches (17.15 cm)
    • Width: 4.375 inches (11.11 cm)
    • Height: 3.75 inches (9.53 cm)
  • Weight: 2.2 Lb (1.0 kg)
  • Auto Turn-On: Main power is manually switched ON/OFF, operation schedule can be pre-set while power is on. Auto Start/Stop based on the pre-set schedule (Start/Stop dates, Start/Stop time)
  • Synchronize Compatibility: JR-1, JR-2, Cronos
  • Management Interface: Android™ WPAN Application


  • Android version 5.1.1 or higher (Lollipop)
    • Recommended: Android version 6.0 (Marshmallow) or higher
  • Device screen size of 5" (17.78cm) or larger

Simply tap on one of the links below using your tablet. Then, select Install and Allow if prompted to do so.

Android™ application: