3rd Rail Transportation Maintenance Inverter From 3KVA to 150KVA


PCTI’s portable third rail inverter is powered directly from the 600VDC third rail to provide clean power for track tools. The unique software capabilities of the digital signal processor (DSP) control allow for universal input. Thus, the inverter can take the typically dirty power within a wide range from 300V to 700VDC and convert it to clean sine wave power capable of powering the most sensitive electronic equipment. The power provided by PCTI’s Third Rail inverter is better than that provided by many power companies.

Standard are a number of protective features that protects maintenance personnel and also protects the inverter from damage caused by a variety of conditions including input polarity reversal. A complete dead front design with no metal parts on the exterior to provide maximum protection to maintenance personnel.


The light weight fiberglass enclosure allows for easy transportation of the inverter. The inverter is the lightest available on the market today: the 3.5KVA inverter weighs only 42 lbs and can power a 4 1/2HP compressor.


The clamps and cables for the third rail portable inverters are optional items sold separately from the inverter. The red clamp is for the positive 600VDC third rail. It connects on the base underneath the rail. The black is attached to the negative return rail.


The inverter can be used to run track tools for moving maintenance or permanent installations such as car signals. The inverter may also be used to power the same when local power goes down.


Standard Inverter Specifications

Inverter ratings range from 3 to 150KVA. All features indicated here are standard unless noted. The dimension and weights below pertain to the 3.5KVA inverter shown above. For specifics on other ratings, request a quote online or download our third rail inverter brochure.

Voltage Range: 300-700VDC
Current: 15ADC (for input voltage 300VDC)
Nominal Voltage: 700VDC
Transients: 50microseconds at 3000V
Transients: 50milliseconds at 2000V
Voltage : 120VAC + 0.5%
Voltage Regulation: 0.5% (for any line and load combination)
Current: 30A RMS continuous
Peak Current: 100A (2 sec)
Starting current: 75ARMS (5 sec)
Response Time: 50mseconds (no load to full load)
Sine Wave Generation: PWM
THD Linear Loads: 3%
THD Nonlinear Loads: 4%
Efficiency: greater than 90% at 700VDC input
Front Panel Devices
Output Circuit Breaker
Start Pushbutton
Stop Pushbutton
Power On Indicating Light
AC Power Available Indicating Light
Overvoltage Shutdown with Auto Restart: 750VDC
Undervoltage Shutdown with Auto Restart: 300VDC
Input Reverse Polarity
Overtemperature Shutdown (Auto Restart)
Electronic current limiting (Auto Reset)
Output Short Circuit via 40A Circuit Breaker
Input to Output Transformer Isolation
Isolation Voltage: 2500VAC min
Input MOV
Output MOV
Output Overcurrent (fixed)
Enclosure: Fiberglass (reinforced polycarbonate)
Nema 3R, totally isolated from any electrical surge
Weight: 45 lbs (3.5KVA)
Inverter Dimensions: 21.25H x 16W x 9D (3.5KVA)
Temperature: Operating Ambient: -25C to 50C
Temperature: Storage Ambient: -25C to 85C
Humidity: 0 to 90% no condensation
Terminations: Input: Detachable 25 foot lead
Terminations: Output: Two NEMA 5-15 outlet
Optional Items
Detachable 25 foot Input lead
Rail Clamp (Positive Red)
Return Clamp (Negative Black)
Mobile Package (handle with rubber tires)