Product Catalog

M.C. Miller JR2

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100 amp M.C. Miller JR2 interrupter.
  • 100 amp AC/DC interrupter
  • Crystal controlled timing
  • Rechargeable battery
  • Immediate or delayed interrupting operation
  • Low battery indicator
  • Capable of re-synchronization.
  • Synchronization better than 1 millisecond.


General Information

MCM's Model JR-2 is a high power interrupter with 100 amperes DC interrupting capability. The JR-2 and JR-1 (35 ampere current interrupter) are of compatible "mix" when being used for multiple interrupter tests.



Custom LCD, wide operating temperature range, -20°C to +85°C (-4°F to +185°F) with enhanced response time at extremely low temperatures. Large(.7" high) digits plus equipment status annunciators.


CMOS Microprocessor, 8-bit; EPROM operating system. EEPROM, initializes prior setting on power up.


Sealed, Tactile feedback; 4x4 Matrix; "0-9"; "?"; "ENTER"; "CLOCK SET"; "START SET"; "ON CYCLE"; "OFF CYCLE" Keys.

Cycle Range:

Keyboard Programmable: .1 to 999.9 seconds in .1 second increments either "ON" or "OFF" cycle.

Auto Turn-on:

Present interrupt start time eg. 0700

Night Latch:

The JR-2 supports 24-hour timing and a scheduled relay closure period. For example, a night latch time of 1700 could be entered from the keypad, and a start time of 0700. The unit will operate normally until 1700, at which time the relay will close and will stay latched until 0700 the next morning, then the normal interrupt cycle will begin again. This feature facilitates full CP polarization during hours when the survey crews are absent.


Timing: 0.5 second maximum variation in 24 hours. Synchronization to within 1 millisecond.

Relay Start Position:

Is in closed position.


Mercury Plunger type:


Sealed, rechargeable, 12 Volt, 6 A/H Charging plug included.

Battery Life:

Use dependant, example:
1 second off - 4 seconds on = 50 hours
4 seconds off - 1 second on = 15 hours


10" H x 10.75” W x 5” D, (26 x 28 x 13 cm)


13 lbs. approx.