XR Expansion Low Cost 4 Channel High Power Relay Controller

ProXR Relay Expansion Board with 4-Channel High Current Relays

This Relay Expansion Controller includes 4 on-board high-power relays, capable of switching 20 or 30-Amps of current, depending on the variant chosen.  This relay expansion controller is designed to plug into our ProXR series industrial relay controllers, and includes the required XR Relay Expansion Controller cable.  On-Board status LEDs indicate the on/off status of each relay.  This expansion controller operates on 12 Volts DC, and may be powered by connecting two-wires to the on-board screw terminal connector, or by plugging in power supply (sold separately) with a 2.1mm center positive barrel connector.

ProXR Expandability

ProXR Controllers were built with relay expansion in mind. Easily add different types of relays for high-power, signal, general purpose, or solid-state switching.  The XR Expansion Port allows you to also add expansion boards and control up to 256 relays.

Above: A 4-channel ProXR Series Controller (bottom) shown with an 8-channel expansion board attached.
Simply chain the XR Expansion Modules, one after another, to add additional relays to any ProXR board up to 256 relays.

XR Expansion Port

XR Relay Expansion Controllers add a large variety of relay switching capabilities to an existing NCD ProXR series controller.

The XR Expansion Port is used to add banks of external relays to a ProXR Controller equipped with a XR Expansion port.  As we continue to develop new devices, a modular architecture will be implemented, offering the greatest amount of user flexibility.

Controlling XR Expansion Banks

FXR Expansion Boards have no on-board brains. They are entirely reliant on the brains of a “master” ProXR device.  The XR Expansion Modules have many possibilities:

• Adds up to 256 Relays to a ProXR Series Controllers

• Mix and Match Relay Types to Suite your Application Needs
• Choose Between Mechanical and Solid-State Relay Types
• Choose DPDT Relays for Signal Switching Applications

Linking XR Expansion Boards Together

XR Expansion Controllers consist of a XR Input and XR Output Connector.  Simply connect the XR Output of your ProXR Controller to the XR Input located on the relay expansion board.  Chaining more relays is easy.   Simply connect the XR Output of your ProXR expansion board to the XR Input of your next relay expansion.  Mix and Match different relay types as your application requires.

We always include a 6″ expansion cable with your expansion board.  We can provide longer cables if needed, but it’s important to keep the cabling as short as possible.  Not all users will be able to expand to 256 total relays, as it all depends on the installation, the amount of electrical interference, and the overall cable length.  For best compatibility, the total length of the ProXR controller and all of the expansions and cabling should not exceed 1 or 2 meters.

20-Amp SPDT Relay Option

This controller is available with a 20-Amp relay option, allowing control of high-power loads up to an absolute maximum of 240VAC at 20 Amps. Ideal for high-power switching applications, this relay should never be used for low-power signals. The 20-Amp relay is of the SPDT variety, which provides Common (C), Normally Open (NO), and Normally Closed (NC) connections. Common is connected to NC when the relay is off. Common disconnects from NC and connects to NO when the relay is activated. This relay uses .250″ Quick Connect terminals (optional accessory) to connect to the top side of the relay. The relay is molded with COM, NC, and NO markings into the plastic.

30-Amp SPST Relay Option

This controller is available with a 30-Amp relay option, allowing control of high-power loads up to an absolute maximum of 240VAC at 30 Amps.  Ideal for high-power switching applications, this relay should never be used for low-power signals.  The 30-Amp relay is of the SPST variety, which provides Common (C) and Normally Open (NO) connections.  Common has no connection when the relay is off.  Common connects to NO when the relay is activated.  This relay uses .250″ Quick Connect terminals (optional accessory) to connect to the top side of the relay.  The relay is molded with COM, NO markings into the plastic.

Features

• Four On-Board High-Current Relays
• Available with 20-Amp SPDT or 30-Amp SPDT Relays
• On-Board Screw Terminal Connectors (HP Version)
• For High-Current Switching Applications
• XR Input and Output Connectors
• Includes 6″ XR Expansion Cable
• On-Board Power and Relay Status LEDs
• Dual 2.1mm and Screw Terminal Power Connectors
• Compatible with ProXR AD8 and ProXR UXP Controllers