A Trusted Resource
in Remote Racking and Operation
A time-tested and proven product in the SR-U family:
The MDU-28. This patented Safe-T-Rack © Motor Drive Unit is lightweight enough to be portable and convenient.
The Safe-T-Rack© M28 Motor Drive Unit
Power. Portability. Reliability.
The M28
Motor Drive Unit:
Designed with Portability in Mind
Powered by a rechargeable Milwaukee M28 battery, this Motor Drive Unit (MDU) is equipped with a brushless motor and a tightly integrated gear reduction system.
» Lighter, with more power
A remote racking device that’s easy for your crew to move and use
» Longer Running Time
Maximizing power and battery life for effective and safe remote racking
» Compatible with
Vertical Lift Breakers
Auto-shutoff and auto-disconnect to protect the operator and equipment
» 400 RPM Speed
Nearly 10x speed over over the MDU-28 series with extra torque for heavy load breakers
» Variable Torque and Force Feedback Technology
Auto-returns to slow torque and speed at the start and stop of the racking screw. Prevents equipment damage.
» Durable
Rugged weather-protected carrying case and designed for years of use.
5kV-15kV Cutler Hammer VCP-W Breakers
15kV Myers Controlled Power VHK Breakers
15kV J3MAG – Aux Compartment JST Power Breakers
480V 600-800 GE OEM Compact AKR-30 Breakers
38kV VCP-W Cutler Hammer Breakers
38kV Hyundai HVF Breakers (with Swing Door)
5kV Square D, Schneider Motorpact Contactors
5kV Square D, Schneider VACARC V5D Breakers
Understanding the Safe-T-Rack ©
Remote Racking System:
The patented Safe-T-Rack Motor Drive Unit (MDU) is powered by rechargeable Miiwaukee batteries and a custom-designed brushless motor and tightly integrated gear reduction system.
Weighing in at only 9 pounds, the MDU is lightweight enough to be portable and convenient but capable enough to remotely ack heavy load and vertical lift breakers. Force feedback technology and custom software allows specific turn counts and speeds for each application and mimics human behaviors to prevent damage to equipment.
The MDU works in tandem with the Smart Drive Bracket (SDB) and Handheld Controller (HHC) to remotely rack a breaker. The MDU is mounted onto the Smart Drive Bracket (SDB) and, once secured in place, interacts with the racking port, following directives from the field operator using the Handheld Controller (HHC).
The Safe-T-Rack © Smart Drive Bracket is suspended from or secured to the cubicle of a breaker and supports the Motor Drive Unit (MDU) to complete the remote racking process. An SDB is designed specifically by application, but usually includes:
- Drive Rings with Locking pin – to support MDU during racking process
- Smart Card with pre-installed software specific to the breake
- Communications Cable – will attach to MDU during racking process
- Keyhole Slots or Mounting Hardware to secure SDB to breaker
There are multiple styles of Smart Drive Brackets, specifically designed for each breaker or cubicle setup by our talented team of designers and engineers. Some SDBs are suspended from a cubicle using a pre-installed Cubicle Kit, which usually consists of shoulder bolts mounted to the cubicle. assuring correct and secure placement of the MDU during every racking sequence.
Smart Drive Brackets can also be “No-Mod” in certain cases, using magnets or locking clamps to secure to a breaker and requiring no permanent alterations to equipment. Talk to our sales team today to learn if one of these designs is available for your equipment!
The Safe-T-Rack© Handheld Controller is custom-built in our Tucson, Arizona facility and is pre-loaded with software and capability to interact with applicable breakers and systems, assuring a safe and effective racking process.
The Handheld Controller allows the user to interact with the SDB via a 50′ Communication Cable, and displays important information, including desired result of racking process, current known status of the breaker, progress and updates during racking sequence, and error or recovery information, if applicable.
This patented design was created with portability, ease-of-use, and functionality in mind.
Many Smart Drive Brackets ( SDBs) are suspended from a cubicle using a pre-installed Cubicle Kit, which usually consists of shoulder bolts mounted to the cubicle. assuring correct and secure placement of the MDU during every racking sequence. Both Cubicle Kit and Smart Drive Bracket (SDB) are labeled with correct color code for that application.
Cubicle Kits arrive with a custom Template, which assists with correct placement of shoulder nuts and prevents incorrect hardware mounting on cubicle.
Smart Drive Brackets can also be “No-Mod” in certain cases, using magnets or locking clamps to secure to a breaker and requiring no permanent alterations to equipment. Talk to our sales team today to learn if one of these designs is available for your equipment!
Every application is custom-designed to fit your breaker and cubicle. If we don’t have an existing application for your equipment, we’ll design one!
Some common accessories in a Remote Racking System include:
- Tool Adapter Assembly – attaches to MDU to reach/interact with racking port
- Communication Cords – used between MDU and SDB and SDB and HHC
- Spanner Bar Assembly – extends across cubicle face to support SDB
- Interlock Assembly – for equipment that also requires manipulation of interlock for successful operation. Contact our sales team for details!
- Milwaukee Batteries and Charger – each kit includes two (2) batteries and a battery charger
- Intermediate Tool Assembly – integrates with interlock/racking port to successfully rack breaker
Not sure what tools or accessories your equipment needs? Contact our sales team today!
See the M28 Motor Drive Unit in Action with these Applications:
STOUT is an open-door remote racking application that features the M18 Motor Drive Unit engaging with a Smart Drive Bracket, operated using the same Handheld Controller that currently racks over 250 applications with a safety distance of up to 150 feet away.
The M18 Magneblast racking system mounts in under a minute and requires virtually no modifications to the breaker or the cubicle – a true advancement in Magneblast racking technology and a safe, cost-effective solution to other products on the market.
The M18 Magneblast racking system mounts in under a minute and requires virtually no modifications to the breaker or the cubicle – a true advancement in Magneblast racking technology and a safe, cost-effective solution to other products on the market.
Our existing racking product for the Gen. 4 Magneblast, SR/SR-N, is still available and offers different features and capabilities than the M18 design.