RC-4A - Viking Electronics

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Control Relay Contacts Across a Local Area Network

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Product Details

The RC-4A Network Enabled Relay Controller provides networked control of four relays via an easy-to-use web interface. The same interface can be used to check the status of four contact closure inputs. Relays can be toggled on or off, or activated for a length of time.

The RC-4A can be configured to work as a remote relay for Viking VoIP series phones, controlling door strikes and gates when a remote relay is required for security reasons. It can also be programmed to send an email or text message in response to a change in one or more of the sensor inputs. Two RC-4A’s can be set up so that activity on a sensor input of one unit will automatically send a message across the network to activate one of the relays on the other unit.

Two levels of user access permit selected users to have full operational and programming rights while others have operational control but not programming capability.


Remote Control of:

  • Secure building entry
  • Heating / cooling equipment
  • Pumps and fans
  • Security systems
  • Gates
  • Lighting
  • Emergency tones




  • Terminal strip connections for normally open, normally closed, and common for all four relays
  • Relays can be toggled or timed closures of from 1 to 99 seconds can be activated
  • Terminal strip connections for all four sensor inputs
  • Notification by email or text message of sensor input state change
  • Can be used as a secure remote relay for Viking VoIP series phones
  • Remote Interaction: sensor change on one RC-4A triggers relay activation of a second RC-4A across network
  • Ready-to-use webpage control interface
  • Encrypted login
  • Two levels of access based on login:
    – Administrator (full access)
    – Guest (programmable limits)
  • Relay names, input names and input status can be customized on webpage
  • Firmware updatable


  • Power: 120VAC/12VDC 500ma UL listed adapter provided
  • Dimensions: 5.25” x 3.5” x 1.75” (133mm x 89mm x 44mm)
  • Shipping Weight: 1.6 lbs (0.73 kg)
  • Environmental: 32 F to 90 F (0 C to 32 C ) with 5% to 95% non-condensing humidity
  • Relay Contact Ratings: 5A @ 30VDC/120VAC
  • Connections: (1) 12 position screw terminal block, (1) 6 position elevated screw terminal block
  • LAN Interface: (1) RJ45 10Base-T/100Base-TX
  • Minimum Requirements: Windows XP and newer, Mac OSX or newer, Android 2.2 or newer, iOS4 or newer (iPhone requires chrome), Javascript enabled internet browser


  • FCC Part 15