The X-20s™ expansion module is used with an X-400 or X-600M controller. The X-20s has six, high-current relays, each with Form-C contacts (SPDT) and six, optically-isolated digital inputs. A screw terminal strip provides high-current connections to the relays.

The X-20s is suitable for use with controlling relatively heavy loads such as motors, solenoid valves, and lights. Switches can be connected to the X-20s’ digital inputs to locally control these loads. The digital inputs can also be used for other monitoring applications such as limit switches, security sensors, or light switches.

Since the X-20s functions as a slave device to the X-400 or X-600M controller, the advanced features of the controller can be utilized with this module. For example scheduling, remote relay control, logging, counting, email alerts based upon single input state change or multiple input state changes, and many other features are available. Attach multiple X-20s modules or a combination of expansion modules to the X-400 or X-600M for an I/O combination that is tailored to your specific needs.

Other expansion modules with different I/O combinations are also available.

X-20s Part Number

X-20s Relays: 6 (277VAC, 30VDC) Digital Inputs: 6 (4-28VDC) 9-28 VDC (24V recommended)


  • 6 isolated relays SPDT
  • Relay functions: ON/OFF or Pulse
  • Great for heavy-load applications including:
    • Motors
    • Solenoid valves
    • Lights
    • and much more …
  • Thermoplastic, UL94V-0, 3-wall, 0.375 inch pitch
  • 6 optically-isolated digital inputs
  • Digital input functions:
    • Monitor State
    • Control Relays
    • Control Remote Relays
    • Count
    • Frequency
    • High Time
    • ON Time
  • 13 LEDs for outputs, inputs, and power
  • Power Supply: 9-28 VDC (24V recommended)

Power Requirements

  • Voltage: 9-28 VDC (24V recommended)*
  • Max Current: See table below for typical values at 25°C.
Power Supply All Relays OFF All Relays ON
9 VDC 20 mA 750 mA
12 VDC 16 mA 555 mA
24 VDC 12 mA 285 mA

Relay Contacts

  • Number of Relays: 6
  • Max Voltage: 277VAC, 30VDC
  • Max Current: 15A
  • Contact Type: SPDT
  • Load Type: General Purpose
  • Contact Resistance: < 30 milliohms initial
  • Contact Material: AgSnO2
  • Electrical Life: 100K cycles (Typical)
  • Mechanical Life: 10M cycles (Typical)
  • Environmental Rating: Over voltage Category II, Pollution Degree 2
  • Relay Modes: ON/OFF or Pulse
  • Pulse Timer Duration: 0.1 to 86,400 Seconds (1-day)

Digital Inputs

  • Number of Inputs: 6
  • Type: Optically-Isolated
  • Voltage Range: 4-28VDC
  • Vin Hi (Min):
  • Vin LO (Max):
  • Current: 950uA @ 4V, 8.5mA @ 26V
  • Minimum Hold Time:
  • Input Isolation: 1500V
  • Input Functions: Asynchronous status of the digital inputs
  • Number of Counter Inputs: 6
  • Maximum Count: 32-bit
  • Max Count Rate: 200 Hz
  • Edge Trigger: Rising, Falling or Both
  • Frequency: 1 Hz min, 200 Hz max
  • High Time: Pulse width (4,194,304 seconds max)
  • On Time: Accumulated time an input is asserted (4,194,304 seconds max)


  • Expansion Connector: Ribbon cable, 2×5-position, polarized 0.100″ pitch
  • Relays: Thermoplastic, UL94V-0, 3-wall, 0.375″ pitch
  • Inputs: PCB terminal block, screw connection, 3.81mm pitch

LED Indicators

  • Number of LEDs: 13
    • Power on
    • Relays 1-6
    • Digital Inputs 1-6


  • Size:
    • 8.60in (218.44mm) wide
    • 4.95in (125.73mm) tall
    • 2.16in (54.86mm) deep
  • Weight: 17 oz (474 g)
  • Enclosure Material: PVC
  • Enclosure Flame Rating: UL94 V1


  • Operating Temperature: -40°F to 135°F (-40°C to 57°C)
  • Storage Temperature: -40°F to 185°F (-40°C to 85°C)
  • Humidity: 5-95%, non-condensing
  • Altitude: Up to 2,000m
  • Indoor use or NEMA-4 protected location

Electromagnetic Compliance

  • IEC CISPR 22, CISPR 24
  • FCC 47CFR15 (Class B)
  • EN55024 ITE Immunity (2010)
  • EN55022 Emissions (2010)

Product Safety Compliance

  • UL 61010-1 (Electrical Equipment for Measurement, Control, and Laboratory Use)
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