Ontrol RK-4 Relay Output Module

Feature & Principle

It is a 4-channel relay expansion module for building BMS. It supports two control modes: 0-10V analog voltage control and flat ribbon cable bus control with Ontrol main controller. Each relay provides independent NO/NC dry contact output, with LED status indicator. Multiple modules can be cascaded to expand the number of switching points for fan, valve and lighting control.

Specifications

Model: RK-4 Brand: Ontrol Channel: 4 channels, SPDT Contact rating: 10A 250VAC Power supply: 24VAC / 24VDC Control signal: 0-10VDC or ribbon bus Mounting: 35mm DIN rail Power consumption: 2W Application: Building BMS, HVAC, lighting and valve control Certification: CE

Components & Diagnostics

Main control PCB, relay group, status LED, terminal block, ribbon connector. Common faults: relay contact burnout, communication failure, LED no indication, module no response.

Product Brief

RK-4 relay expansion module, Ontrol BMS spare widely used for HVAC, lighting and electric valve control cabinet maintenance and replacement.