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Ritz RZ3 LV Soft Starter

The RZ3 introduces a new generation in soft start technology: XLR-8, Adaptive Acceleration Control. XLR-8 offers an unprecedented level of control over motor’s acceleration and deceleration profiles. Using XLR-8, the soft starter learns the motor’s performance during start and stop, then adjusts control to optimize performance.

The  RZ3 soft starter is smart, dependable and easy to use. New design features make the RZ3 the perfect solution for quick set-up or more customized control.

  • Features
  • Specifications
  • Applications
  • Accessories


  • Flexibility
  • Intuitive Interface
  • A Human Interface
  • Quick Setup
  • Monitoring Screens , Logs and Counters
  • Extensive Input/Output
  • Compact Physical Design
  • Bypass (Built-in, Externally, Internally)
  • Adjustable Busbars
  • Easy Access Cabling
  • Communication Modules and
  • Software Tools


Mains voltage

: 200 VAC ~ 525 VAC or
  380 VAC ~ 690 VAC

Current Range

: 23 ~ 1600 A

kW Range

: 11 ~  800 kW

Motor connection

: Inline or inside-delta


: Integrated internal or external

Mains frequency

: 45 Hz to 66 Hz



  • Marine
  • Pumping
  • Low inertia loads - pumping or conveyors
  • High inertia loads - Circular saws, ball mills
  • Compressors (for optimizing blade control)
  • Bandsaws (easy blade alignment)
  • Irrigators (built-in timer)


Communication modules

The RZ3 supports network communication using
  • Ethernet (Profinet, Modbus TCP, Ethernet IP)
  • Profibus,
  • DeviceNet,
  • Modbus RTU or
  • USB protocols,
via easy-to-install communication interfaces

Remote control panel

Full graphical LCD display. Replicate built-in RZ3 display functionality and contentOperate in parallel to built-in RZ3 display and interfaceParameter Upload/Download capable – transfer parameters between RZ3 soft starters. Can be removed and attached while soft starter is running.Remote mountable keypad with up to 3m cableIP65 capable (with supplied mounting kit

PC Software

Using RitzMaster software you can control up to 99 Soft starters, Modbus or USB communication module is required for each soft starter to use Ritzmaster software.

Finger Guard kit

Finger Guards may be specified for personal safety. It fit over the soft starter terminals to prevent accidental contact with live terminals. Finger Guards provide IP20 protection when correctly installed.

Can be used on RZ3-0145B to RZ3-1000B. Different kits are required for different models.