USA Made and Manufactured
AREMA Compliant
Rugged Construction
Impedance Bonds for Tuned & Un-Tuned circuits
Cooling Medium - Petrolatum
Standard & Custom Designs
Features of the Noratel Impedance Bond

Noratel Impedance Bonds are built to meet the stringent mechanical and electrical requirements of AREMA, Communications & Signal Manual. They are tuned or un-tuned with capacity of up to 2,500 mps per rail.


Our Impedance Bonds are  made of high quality material, ruggedly constructed & adhering to IP57 and have been in service for various transit systems since 2000.

Impedance will drop <10% with a maximum traction current unbalance of 12%.

A 1500 Amps Impedance Bond used for traction current is capable of sustaining a surge of 3000 Amps per rail up to 15 minutes or 10,000 Amps for 1 minute.

Compatible with current requirements of traction power system and with PF track circuit.

The core nucleus is fabricated from silicon steel with C-4 coating on both faces. The insulators used are class H 350°F minimum (220°C), sufficient for even the most severe conditions.

The bonds are filled with petrolatum to provide protection from moisture, corrosion, and to aid in cooling.

So, what is an Impedance Bond really?

The Impedance Bond enables transmission of reverse catenary, heating, or auxiliary current over the insulated rail joints from one track section without interfering with the functioning of adjacent track.

Most railroads use track circuits to determine the location of trains. Tracks are divided into insulated blocks that have separate electric circuits (AC current). If a train is present, the wheels connect two tracks and short out the circuit.

Impedance bonds are used to connect the insulated tracks to allow the passage of DC traction current but not the AC signal used for locating purposes.

Electrical impedance is the frequency dependent measure of the voltage-to-current ratio that determines how much AC and DC current can flow for a given voltage.

Why choose Noratel?

We are well recognized and established as a reliable and quality supplier in the rail and transit systems industry.

We are an ISO 9001 registered company, and understand customer requirements. We strive to provide quality products that meet or exceed expectations.

We offer competitively priced products and outstanding lead-times.

From design to delivery, customer satisfaction is #1 - Only Noratel's culture of teamwork, ethics, and modern technology can deliver results unlike any other competitor in the industry.

Let's break it down to specs and characteristics....

Standard Impedance Bond part numbers are listed below for quick ordering. Contact us for details or customized quotes. 

Impedance Bonds

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1117 E. Janis Street

Carson, CA 90746, USA

 © 2017 Noratel Power Engineering, Inc.