RK4 Relay Module

RK4 is intended for use with various Ontrol controllers, or other BMS systems, to enable on/off switching of loads. It provides 4 independently switchable relays. For each relay, both normally-open and normally-closed contacts are available for wiring. LEDs indicate status of the relays and supply voltage.

RK4 has two modes of operation.

  1. Analog Control : A 0-10 V input is provided for controlling each relay independently. In this mode, the RK4 is a general-purpose analog-to digital converter that can be used with any BMS controller. See specifications for switching voltages.
  2. Ribbon-cable connection : When connected to a compatible Ontrol controller via the ribbon cable connection, the relays are directly controlled by the attached controller. In this case, analog input terminals are not used.
    Ribbon cable connectors  are on the bottom of the module, allowing the cable to lie flat in the DIN rail. Two connectors are provided to allow daisy-chain connection of multiple RK4 modules:
    P-ION : max 2 relay modules for up to 8 relay outputs
    R/MIO : max 1 relay modules for up to 4 relay outputs
    R/TIO : max 2 relay modules for up to 8 relay outputs
    M/TIO : max 2 relay modules for up to 8 relay outputs 
Power supply 24 VAC ±%10, 50/60Hz or 24Vdc ±%10
Power consumption 2W
Input signals 0-10 Vdc into 33 KOhm impedance
Output contacts 10A at 230Vac (resistive load)
LED indication 4x relay status
Power supply present
Connections Plug-in terminals, max 1 x 2.5 mm²
Operating temperature range -10..50 °C (14..122 °F)
Non-operating temperature range -25..+75 °C (-13..+167 °F)
Humidity range 5...95 % rh, non condensing
Weight 184 gr
(with terminals)
114.80 x 69.60 x 56.10 mm
(4.52 x 2.74 x 2.20")
Mounting 35mm standard DIN rail mount
Degree of protection IP20, EN 60529