NoMod Magneblast Racking Device

Safe-T-Rack® SR-U remote racking for GE Magneblast Breakers is the only battery-operated system that’s fully automated, portable and scalable that keeps your team and equipment safe.

The First Portable Magneblast Racking Device

Building from the success of our MDU-28 line, the MDU-18 is an open door application that features the M18 engaging with a Smart Drive Bracket, similar to those in the SR-U product line, and is operated by the same Handheld Controller that currently racks over 250 applications. This is without a doubt the safest and lightest Magneblast racking system on the market.

» 400 RPM Speed

Nearly 10x speed over over the MDU-28 series with extra torque for heavy load breakers


» Variable Torque

Auto-returns to slow torque and speed and the start and stop of the racking screw

» Lighter, with more power

A remote racking device that’s easy for your crew to move and use

» Vertical Lift Breakers

Auto-shutoff and auto-disconnect to protect the operator and equipment

The Smart Drive bracket

The SR-U Smart Drive Bracket is the direct interface of the Magne-Blast breaker and the M18 motor. As an open-door NoMod Bracket, no holes are required to be punched nor are external wires connected to the breaker necessary to operate this system.

The Bracket mounts using two steel pegs that rest in existing holes on a motor mount. The cable, attached to a mechanized arm, hooks to the cluth lever and engages the racking screw with the Bracket. The M18 secures to the Drive Bracket thorugh the mounting rings on the front with a locking pin on the top of the rings. When in place, the breaker is ready to be racked.


The SR-U family proudly uses Milwaukee M18 series cordless power tool batteries. These provide ample energy for hundreds of different racking applications in our lineup. Two batteries are provided in the portable kit for quick changes.


Included with the Handheld Controller, the SR-U control cable features high-cycle duty mating connectors. The cable assembly is available in 50-foot segments that can be tethered with three cables for up to 150 feet of safe distance for the operator.

Motor Drive Unit

Designed specifically for the Magne-Blast, this heavy-duty motor provides a NoMod solution to racking Magne-Blast breakers. No holes are required to be punched in the cubical and no other modifications are necessary to rack the breaker.

Fail-safe Features

Application specific:

  • Battery charge indicator
  • Automatic App ID
  • Torque limited output
  • Emergency stop available

Automatic recovery for:

  • Stall
  • Overtravel
  • Zero speed

The lightest on the market

Universal Handheld Controller (SR-U-HHC)

We designed the SR-U Handheld Controller (HHC) to operate with the SR-U family of tools. The operator has complete control and monitoring of every step of the breaker racking sequence. The HHC is packaged in a high- impact polymer case designed to withstand the daily wear and tear associated with heavy, industrial, and utility environments. Coupled with any of our Smart Drive Brackets, the Handheld Controller is the lightest and most durable operating tool on the market.

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