Schneider Electric (Barber Colman) AM-708 Resistor

The Schneider Electric (Barber Colman) AM-708 Resistor is a field-essential 500 Ohm resistor designed for precise signal conditioning in commercial building automation and industrial process controls. For technicians integrating legacy 4-20mA sensors with modern 2-10Vdc controllers, this shunt resistor provides a reliable, low-profile solution for voltage conversion. Field installations often require adapting proportional SmartX actuators to interface with standard current loops; the AM-708 simplifies this by converting the current signal directly at the terminals.

Built with pre-stripped 9-inch hook-up wires and protected by durable shrink-wrap tubing, this component is engineered for longevity in demanding mechanical environments. It maintains a 1% tolerance and a 100ppm/°C temperature coefficient, ensuring signal integrity across an operating range of -55°C to +155°C. Whether you are servicing Schneider Electric MS40 or MS41 series actuators, this high-stability 0.25W resistor eliminates the need for complex interface modules, allowing for clean, line-side signal conversion using simple wire nuts or screw terminals.

• Precise Signal Conversion: Accurately transforms a 4 to 20mA current signal into a 2 to 10Vdc voltage signal.
• Actuator Compatibility: Optimized for use with Schneider Electric SmartX actuators including MS40, MS41, and MX4X series.
• Field-Ready Design: Features 9-inch pre-stripped leads and protective shrink-wrap for rapid installation.
• Industrial Durability: Rated for extreme temperatures and high-vibration HVACR environments.

Where should the AM-708 be installed in the control loop?
This 500 Ohm resistor is typically installed in parallel at the input terminals of the receiving controller or actuator to drop the 4-20mA signal into the required 2-10Vdc range.

Can this resistor be used with other actuator brands?
While designed for Barber Colman and Schneider Electric hardware, it is compatible with any terminal requiring a 2-10Vdc signal from a 4-20mA source, provided the wattage requirements are met.

What is the purpose of the 9-inch length?
The 9" lead length provides sufficient slack for clean routing within electrical enclosures and junction boxes, specifically for MS40-7043 and MS41-6083 assemblies.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.