Overview
The MTR AB-145446 is a two-wire lead varistor designed for use in industrial power electronics and variable frequency drive circuits. This 550/575 VRMS 120J varistor provides reliable voltage transient suppression in AC power circuits, protecting sensitive downstream components from overvoltage spikes. Common applications include Allen-Bradley 1336-series drives and similar industrial AC variable speed applications.
Key Features
- Metal oxide varistor (MOV) technology for fast response to voltage transients
- Rated for 550/575 VRMS continuous operating voltage
- 120 joule maximum energy absorption capacity
- Two-wire lead configuration for direct circuit board integration
- Compact form factor suitable for retrofit and replacement installations
Technical Specifications
The MTR AB-145446 meets the following specifications:
- Voltage Rating: 550/575 VRMS (AC)
- Energy Absorption: 120 joules
- Configuration: 2-wire lead
- Manufacturer: MTR (Microdyne Technologies, Inc.)
- Part Number: AB-145446
- Weight: Approximately 50 grams
- Lead Type: Solder or compression terminals
Typical Applications
The MTR AB-145446 varistor is widely used in:
- Allen-Bradley variable frequency drive input circuits (1336 series and similar)
- AC motor control and power conversion equipment
- Industrial power supply transient suppression
- Three-phase drive protection networks
- Retrofit and field replacement in installed industrial systems
Compatibility & Replacements
Compatible With
- Allen-Bradley 1336 series variable frequency drives
- AB PowerFlex drives requiring MOV transient protection
- Industrial AC circuit protection networks operating at 550–575V AC
- Control boards using 2-wire varistor packages
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The MTR AB-145446 is designed as a direct replacement for OEM AB-145446 varistors in existing circuit boards, but form factor and lead configuration must match.
Works With
- Allen-Bradley PowerFlex AC drives
- Siemens SINAMICS variable frequency drives (where compatible voltage and energy ratings apply)
- General-purpose AC motor controllers with transient suppression requirements
- Power electronics modules requiring 550V VRMS MOV protection
