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
  • Bluetooth™ 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 Bluetooth® 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 Bluetooth.

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™ Bluetooth® 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: